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Search DetailsARAKAWA MasahikoGraduate School of Science / Division of PlanetologyProfessor
Researcher basic information
■ Research news- 02 Jun. 2021, Did heat from impacts on asteroids provide the ingredients for life on Earth?
- 30 Oct. 2020, Asteroid Ryugu shaken by Hayabusa2’s impactor
- 25 Mar. 2020, Creating a crater to constrain the age of an asteroid's surface
- Rheology
- Space glaciology
- Planetary formation process
- Impact process
- Icy satellites
- Planetary sciences
- レオロジー
- 宇宙雪氷
- 惑星形成過程
- 衝突過程
- 氷衛星
- 惑星科学
■ Committee History
- Jan. 2021 - Present, 日本惑星科学会, 将来計画専門委員長
- Apr. 2020 - Present, 日本地球惑星科学連合, 代議員
- Jan. 2019 - Dec. 2020, 日本惑星科学会, 将来計画専門委員長
- Jan. 2017 - Dec. 2018, 日本惑星科学会, 会長
- Jan. 2015 - Dec. 2016, 日本惑星学会, 副会長
- Jan. 2013 - Dec. 2014, 日本惑星科学会, 将来計画専門委員長
- Jan. 2007 - Dec. 2012, 日本惑星科学会, 運営委員
- 2001 - 2006, 日本惑星科学会, 総務専門委員長, 日本惑星科学会
Research activity information
■ Award- 2020 神戸大学, 学長表彰, 「はやぶさ 2」による宇宙衝突実験
- 2017 日本学術振興会, 平成28年度特別研究員等審査会専門委員表彰, 書面審査で有意義な審査意見を付した任期2年目の専門委員Others
- 2000 日本雪氷学会, 2000年度日本雪氷学会平田賞受賞, 宇宙における雪氷の実験的研究Japan society
- Nov. 2025, International Journal of Impact EngineeringScientific journal
- Aug. 2025, International Journal of Impact Engineering[Refereed]Scientific journal
- Corresponding, Elsevier BV, Mar. 2025, Icarus, 429, 116449 - 116449[Refereed]Scientific journal
- Elsevier BV, Jul. 2024, Advances in Space Research, 74(2) (2), 899 - 936Scientific journal
- Abstract: A sphere cluster (SPH-Mas) based gravity model allows a semi-analytic expression of the linearised equations around the equilibrium points. Depending on the sphere packing distribution, the SPH-Mas model can retrieve the same dynamical objects common to others gravity models (i.e. spherical harmonics and polyhedron) or for non-uniform density objects. This model has the advantage to define the same particles mesh distribution for both astrophysical and astrodynamics tools. The Hayabusa2’s Small Carry-on Impactor operation is used as a scenario to study the ejecta particle dynamics around an irregular body. The goNEAR (gravitational orbit Near Earth Asteroid Regions) tool was used to simulate the impact operation in a non-linear sense when the effect of the solar radiation pressure perturbation is taken into account for particles size of 10 cm, 5 cm, 1 cm and 1 mm in diameter.Introduction: In November 2019, the Japanese Hayabusa2 spacecraft completed an 18 months mission exploration around the asteroid Ryugu [1] and it is expected to return to Earth late this year (2020). JAXA’s Hayabusa2 and NASA’s OSIRIS-Rex missions [2] are contributing to answer fundamental questions related to the formation of our solar system and the origin of Life [3]. After a successful touchdown in March 2019, Japan has set a new first when in April 2019 the Hayabusa2 spacecraft deployed and activated the explosive Small Carry-on Impactor (SCI) to successfully form an artificial crater [4].We propose a genearlised methodology to study the dynamics around Equilibrium Points (EPs) of irregular bodies with application to the asteroid Ryugu [5]. To the core of our study, we aim to gain a general insight on the dynamics around irregular shape bodies for studying the dynamics of ejecta particles. Moreover, we are looking into a generalised gravity model of celestial bodies that can be easily extended not only to any irregular shape bodies but also to arbitrary density distributions [5]. The selected generalised gravity model provides a mass distribution that can be used for both hydrodynamics impact simulations and orbital dynamics around EPs.Background: The mascons (“mas”s “con” centrations) has been mainly used for explaining the Lunar gravity anomalies originally detected in 1968 [6]. Conversely, Smooth Particles Hydrodynamics (SPH) codes are often used to simulate asteroid impact events and share the problem to handle the transition between a SPH simulation and N-body simulations [7]. Since the SPH and Mascons make use of the same mass conservation law and we are interested to interface the SPH simulations with the N-Body simulations, we will rename the selected gravity model as the SPH-Mascons (SPH-Mas) model.Figure 1: Sphere packing and the equilibrium points [5].SPH-Mas Gravity Model: The gravity of an irregular shape body is modelled with a cluster of spheres, SPH-Mas. Each spherical particle contributes in the overall gravity field of the body. The exterior gravity potential of each sphere behaves as a single point mass. The potential of the irregular body is the result of the summation of each point mass’s potential that contributes to the overall potential field such that:                                                                                     (1)where  mi (i = 1, ..., Nsph) is the mass of each SPH-Mas for a total of Nsph masses. r is the distance from the field point and the center of the asteroid. ri is the distance of each masses with respect to the center of the asteroid. The total mass of the asteroid is conserved and given by mb = ∑(i = 1,.., Nsph) mi.Figure 2: Shape model [1] and the equilibrium points.Sphere Packing: We consider Ryugu’s polyhedron model published in [1] as our “high fidelity” gravity model. We distribute the SPH-Mas within the asteroid shape such that we can approximate Ryugu’s “high fidelity” gravity field. For the scope of testing our semi-analytic formula, we compared a uniform sphere packing approach with a random packing approach for different numbers of SPH-Mas. Fig. 1 shows the comparison between the uniform distribution in the left panel and the random distribution in the right panel for Nsph = 19, 58, 1,605 and 1,406,146. By comparing the location of the EPs between Fig 1 and Fig 2, it is clear that under the assumption of uniform density polyhedron, the uniform sphere packing is preferable to the random sphere packing even for the case of Nsph major to the order of million spheres. Indeed, the random sphere packing does not necessarily preserve the geometry of the EPs that affects the ejecta dynamics.Effect of SPH-Mas Packing onto Particles Dynamics: The derived semi-analytical formula based on an SPH-Mas gravity model is a direct function of the sphere packing distribution (density), their position (ri) and the asteroid’s spin axis angular velocity (7.6 h for Ryugu) which allows to find families of periodic orbits for ejecta particles around an non-uniform irregular shaped asteroid as shown in Fig 3.Fate of Ryugu’s Ejecta: We made use of goNEAR tool to simulate the dynamics of 10 cm, 5 cm, 1 cm and 1mm in diameter size particles under the effect of the solar radiation pressure perturbation. In the numerical experiment, few particles seemed to survive in orbit for diameter of 5–10 cm (Fig 4). The search for evidence of particles in Ryugu orbit is still unconfirmed however the stability of EPs can be linked to long survival particles in orbit. Figure 3: Family of periodic orbits as function of sphere packing [5]. Figure 4: SCI’s ejecta dynamics with the goNEAR tool [5].References: [1] Watanabe et al. (2019) Science, 364, 268–272. [2] Lauretta et al. (2015) Meteoritics & Planet. Sci., 50, 834–849. [3] Sugita et al. (2019)  Science, 364, 6437. [4] Arakawa et al. (2019) Science, under review [5] Soldini et al, (2019) PSS, (2020) 180 [6] Melosh et al., (2013) Science, 340,1552–1555 [7] Ballouz et al., (2018) 49th LPSC.Copernicus GmbH, May 2024
- Keywords: Impact; asteroid surfaces; SSDEM; SPH.Introduction: Impacts can modify the physical state of a substantial fraction of a target body. Studying the hypervelocity impact process and outcome is crucial in the interpretation of the history of a planetary body (Jutzi et al., 2015) and the design of asteroid deflection strategies based on the kinetic impactor technique (Raducan et al., 2019). Images returned by space missions show that small asteroids have complex surface morphologies with heterogeneous distributions of fine regolith and large boulders (e.g., Watanabe et al., 2019). To properly decipher the crater imprints on asteroid surfaces, we carried out numerical investigations to understand the effect of surface material properties (i.e., friction, cohesion) and the presence of large boulders on cratering processes.Methods: We used a hybrid SPH-SSDEM framework to model the high-speed impact cratering (Zhang et al., 2021). The Smooth Particle Hydrodynamics (SPH) is used to simulate the initial shock propagation and fragmentation stage (Jutzi & Michel, 2015). The outcome is then transferred into a Soft-Sphere Discrete Element Method (SSDEM) code (Zhang et al., 2018), which solves the ejecta evolution and crater growth in the later stages. This modeling framework is capable of simulating impacts from the beginning to the later stages when all ejecta are settled down, allowing capturing the final morphology of the resulting crater.To make comparisons with the first impact experiment performed on an asteroid by the Hayabusa2 Small Carry-on Impactor (SCI; Arakawa et al., 2020), we conducted SCI-like cratering tests using the same impact condition (except using an impact angle of 0º) and Ryugu’s gravity field. The target is modeled as a 15-meter-radius granular bed held by a hemispherical ball. The particle-ball contact parameters are the same as those used for particle-particle contacts.Results: As the SCI cratering analyses show consistencies with a very low-strength scaling law (Arakawa et al., 2020), we considered modeling the surface properties with three types of low cohesion (i.e., 0 Pa, 0.01 Pa, and 0.1 Pa) and four types of low to moderate friction angles (20°, 25°, 30°, and 33°). The results show that, in a monotonic manner, the diameter and depth of the resulting crater and rim decrease with a larger friction or cohesion (Fig. 1). Compared with the crater morphology of the SCI impact (i.e., crater diameter 14.5 ± 0.8 m and depth ~2.3 m, rim diameter 17.6 ± 0.7 m and depth 0.4 m), the case with C = 0.1 Pa and 𝜙 = 30° provides the best match. This suggests that the surface fine regolith on Ryugu near the SCI impact site would be likely to have a small amount of cohesion on the order of 0.1 Pa and moderate friction.Figure 1  Crater morphology of SCI-like cratering tests. The material friction angle 𝜙 and cohesion C are indicated in the left bottom for each case. The crater/rim diameter and the crater/rim depth are highlighted by the yellow and green measurements, respectively. The dashed lines indicate the reference of the original surface and the central axis.Nonetheless, the crater growth was undoubtedly affected by the surface morphology as observed during the SCI impact (Arakawa et al., 2020). To test the effect of the presence of boulders, we constructed a target with four boulders imbedded on its cohesionless granular material (Fig. 2d, e).  As shown in Fig. 2, the velocity field of the target is significantly affected by these boulders. The growth of the left region was inhibited by the large block on the left side. The small boulders were elevated by the impact and displaced over 20 m. As the granular bed was mobilized by the impact and the movement of the large boulders, at the end, some granular materials were pushed out and the two large boulders sank into the bottom of the container. This sinkage behavior was not seen at the SCI impact site. This inconsistency may suggest that the subsurface area of this site could have large strength that inhibited the downward movement of large boulders, which is consistent with the formation of the small pit at the bottom of the SCI crater. However, the boundary effect of the simulations cannot be ruled out, and further tests are required.Figure 2  Velocity field at the beginning of the SSDEM-stage simulations (no boulder: a. side view of a cross-section , b. top view; with boulder: d. side view of a cross section, e. top view, where boulders are highlighted by the green dashed curves) and at 100 s (c.no boulder; f. with boulder).Conclusion: Here we present the first step towards modeling impacts into realistic asteroid surface environments using well validated codes. These impacts are challenging to model and only limited number of impact scenarios have been studied so far. We found that the cratering outcome is very sensitive to the target material properties. Further tests against laboratory and in-situ experiments will be carried out to establish the relation between crater morphologies and surface properties, and understand the regolith and boulder dynamics in low-gravity environments. Moreover, comparisons to direct SPH calculations carried out to long times (Raducan & Jutzi, 2021) will allow to assess the differences between continuum and particle-based codes in the modelling of late-stage crater growth.Acknowledgements: This project received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 870377 (project NEO-MAPP). Y.Z. acknowledges funding from the Doeblin Federation. Y.Z. and P.M. acknowledge funding support from the French space agency CNES.References:  Arakawa, M. et al. (2020) Science, 368, 67–71.Raducan, S.D. et al. (2019) Icarus, 329, 282–295.Raducan, S.D. & Jutzi, M. (2021) 52nd LPSC, #1900.Jutzi, M. et al. (2015) In: Asteroids IV (Michel P. et al., eds.) 679–699.Jutzi, M. & Michel, P. (2014) Icarus, 229: 247–253.Watanabe, S. et al. (2019) Science, 364(6437), 268–272.Zhang, Y. et al. (2018) ApJ, 857, 15.Zhang, Y. et al. (2021) 52nd LPSC, #1974.Copernicus GmbH, May 2024
- Elsevier BV, May 2024, Icarus, 413, 116010 - 116010Scientific journal
- Mar. 2024, Icarus, 411[Refereed]Scientific journal
- Mar. 2024, Icarus, 411[Refereed]Scientific journal
- Jul. 2023, Protostars and Planets VII, In Astronomical Society of the Pacific Conference Series, 534, 993 - 1029, EnglishExploration-Based Reconstruction of Planetesimals[Refereed][Invited]International conference proceedings
- The Hayabusa2 spacecraft collected samples from the surface of the carbonaceous near-Earth asteroid (162173) Ryugu and brought them to Earth. The samples were expected to contain organic molecules, which record processes that occurred in the early Solar System. We analyzed organic molecules extracted from the Ryugu surface samples. We identified a variety of molecules containing the atoms CHNOS, formed by methylation, hydration, hydroxylation, and sulfurization reactions. Amino acids, aliphatic amines, carboxylic acids, polycyclic aromatic hydrocarbons, and nitrogen-heterocyclic compounds were detected, which had properties consistent with an abiotic origin. These compounds likely arose from an aqueous reaction on Ryugu’s parent body and are similar to the organics in Ivuna-type meteorites. These molecules can survive on the surfaces of asteroids and be transported throughout the Solar System.American Association for the Advancement of Science (AAAS), Feb. 2023, Science, 379(6634) (6634)[Refereed]Scientific journal
- Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbon, ketone, and carboxyl functional groups. The spectroscopic features of the organic matter are consistent with those in chemically primitive carbonaceous chondrite meteorites that experienced parent-body aqueous alteration (reactions with liquid water). The morphology of the organic carbon includes nanoglobules and diffuse carbon associated with phyllosilicate and carbonate minerals. Deuterium and/or nitrogen-15 enrichments indicate that the organic matter formed in a cold molecular cloud or the presolar nebula. The diversity of the organic matter indicates variable levels of aqueous alteration on Ryugu’s parent body.American Association for the Advancement of Science (AAAS), Feb. 2023, Science, 379(6634) (6634)[Refereed]Scientific journal
- The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth’s volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measured noble gas and nitrogen isotopes in Ryugu samples and found that they are dominated by presolar and primordial components, incorporated during Solar System formation. Noble gas concentrations are higher than those in Ivuna-type carbonaceous (CI) chondrite meteorites. Several host phases of isotopically distinct nitrogen have different abundances among the samples. Our measurements support a close relationship between Ryugu and CI chondrites. Noble gases produced by galactic cosmic rays, indicating a ~5 million year exposure, and from implanted solar wind record the recent irradiation history of Ryugu after it migrated to its current orbit.American Association for the Advancement of Science (AAAS), Feb. 2023, Science, 379(6634) (6634)[Refereed]Scientific journal
- Carbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples of the C-type asteroid (162173) Ryugu were retrieved by the Hayabusa2 spacecraft. We measured the mineralogy and bulk chemical and isotopic compositions of Ryugu samples. The samples are mainly composed of materials similar to those of carbonaceous chondrite meteorites, particularly the CI (Ivuna-type) group. The samples consist predominantly of minerals formed in aqueous fluid on a parent planetesimal. The primary minerals were altered by fluids at a temperature of 37° ± 10°C, about million (statistical) or million (systematic) years after the formation of the first solids in the Solar System. After aqueous alteration, the Ryugu samples were likely never heated above ~100°C. The samples have a chemical composition that more closely resembles that of the Sun’s photosphere than other natural samples do.American Association for the Advancement of Science (AAAS), Feb. 2023, Science, 379(6634) (6634)[Refereed]Scientific journal
- 2023, Journal of Evolving Space Activities, EnglishScientific journal
- Abstract Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe3+ to Fe2+ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.Springer Science and Business Media LLC, Dec. 2022, Nature Astronomy[Refereed]Scientific journal
- Abstract The Hayabusa2 mission impact experiment on asteroid Ryugu created an unexpectedly large crater. The associated regime of low-gravity, low-strength cratering remained largely unexplored so far, because these impact conditions cannot be re-created in laboratory experiments on Earth. Here we show that the target cohesion may be very low and the impact probably occurred in the transitional cratering regime, between strength and gravity. For such conditions, our numerical simulations are able to reproduce the outcome of the impact on Ryugu, including the effects of boulders originally located near the impact point. Consistent with most recent analysis of Ryugu and Bennu, cratering scaling-laws derived from our results suggest that surfaces of small asteroids must be very young. However, our results also show that the cratering efficiency can be strongly affected by the presence of a very small amount of cohesion. Consequently, the varying ages of different geological surface units on Ryugu may be due to the influence of cohesion.Springer Science and Business Media LLC, Nov. 2022, Nature Communications, 13(1) (1)[Refereed]Scientific journal
- The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bottles. The container gas consists of helium and neon with an extraterrestrial 3 He/ 4 He and 20 Ne/ 22 Ne ratios, along with some contaminant terrestrial atmospheric gases. A mixture of solar and Earth’s atmospheric gas is the best explanation for the container gas composition. Fragmentation of Ryugu grains within the sample container is discussed on the basis of the estimated amount of indigenous He and the size distribution of the recovered Ryugu grains. This is the first successful return of gas species from a near-Earth asteroid.American Association for the Advancement of Science (AAAS), Nov. 2022, Science Advances, 8(46) (46)[Refereed]Scientific journal
- Nov. 2022, ICARUS, 387, EnglishScientific journal
- Abstract Japanese Hayabusa2 spacecraft has successfully carried out an impact experiment using a small carry-on impactor (SCI) on an asteroid (162173) Ryugu. We examine the size distribution of particles inside and outside an artificial impact crater (the SCI crater) based on the images taken by the optical navigation camera onboard the Hayabusa2 spacecraft. The circumferential variation in particle size distribution inside the SCI crater is recognized and we interpret that major circumferential variation is caused by the large boulders inside the SCI crater that existed prior to the impact. The size distribution inside the SCI crater also shows that the subsurface layer beneath the SCI impact site had a large number of particles with a characteristic size of – 9 cm, which is consistent with the previous evaluations. On the other hand, the size distribution outside the SCI crater exhibits the radial variation, implying that the deposition of ejecta from the SCI crater is involved. The slope of the size distribution outside the crater at small sizes differs from the slope of the size distribution on the surface of Ryugu by approximately 1 or slightly less. This is consistent with the claim that some particles are buried in fine particles of the subsurface origin included in ejecta from the SCI crater. Thus, the particle size distributions inside and outside the SCI crater reveal that the subsurface layer beneath the SCI impact site is rich in fine particles with – 9 cm in size while the particles on the surface have a size distribution of a power-law form with shallower slopes at small sizes due to the deposition of fine ejecta from the subsurface layer. Finally, we discuss a process responsible for this difference in particle size distribution between the surface and the subsurface layers. The occurrence of segregation in the gravitational flow of particles on the surface of Ryugu is plausible. Graphical AbstractSpringer Science and Business Media LLC, Oct. 2022, Earth, Planets and Space, 74(1) (1)Scientific journal
- Samples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed seventeen Ryugu samples measuring 1-8 mm. CO 2 -bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu’s parent asteroid formed in the outer Solar System. The samples contain low abundances of materials that formed at high temperatures, such as chondrules and Ca, Al-rich inclusions. The samples are rich in phyllosilicates and carbonates, which formed by aqueous alteration reactions at low temperature, high pH, and water/rock ratios < 1 (by mass). Less altered fragments contain olivine, pyroxene, amorphous silicates, calcite, and phosphide. Numerical simulations, based on the mineralogical and physical properties of the samples, indicate Ryugu’s parent body formed ~ 2 million years after the beginning of Solar System formation.American Association for the Advancement of Science (AAAS), Sep. 2022, ScienceScientific journal
- Abstract Experiments on crater formation in the strength regime were conducted using projectiles of various shapes with an aspect ratio of ~ 1, including both solid and hollow interiors. The surface diameter, inner (pit) diameter, and depth of the craters on basalt and porous gypsum targets were measured. Using the bulk density of the projectile, the surface diameter and depth for basalt and the pit diameter and depth for porous gypsum were scaled using the pi-scaling law for crater formation in the strength regime. The numerical code iSALE was used to simulate the impact of projectiles of various shapes and interior structure with similar bulk densities. Results show that the distributions of the maximum (peak) pressure experienced and particle velocity in the targets were similar regardless of projectile shape and interior structure, implying that the dimensions of the final craters were almost identical. This is consistent with the experimental results. Thus, we conclude that the size of the craters formed by the impact of projectiles with different shape and interior structure can be scaled using a conventional scaling law in the strength regime, using bulk density as projectile density. Graphical abstractSpringer Science and Business Media LLC, Aug. 2022, Earth, Planets and Space, 74(1) (1)Scientific journal
- Abstract Volatile and organic-rich C-type asteroids may have been one of the main sources of Earth’s water. Our best insight into their chemistry is currently provided by carbonaceous chondritic meteorites, but the meteorite record is biased: only the strongest types survive atmospheric entry and are then modified by interaction with the terrestrial environment. Here we present the results of a detailed bulk and microanalytical study of pristine Ryugu particles, brought to Earth by the Hayabusa2 spacecraft. Ryugu particles display a close compositional match with the chemically unfractionated, but aqueously altered, CI (Ivuna-type) chondrites, which are widely used as a proxy for the bulk Solar System composition. The sample shows an intricate spatial relationship between aliphatic-rich organics and phyllosilicates and indicates maximum temperatures of ~30 °C during aqueous alteration. We find that heavy hydrogen and nitrogen abundances are consistent with an outer Solar System origin. Ryugu particles are the most uncontaminated and unfractionated extraterrestrial materials studied so far, and provide the best available match to the bulk Solar System composition.Springer Science and Business Media LLC, Aug. 2022, Nature Astronomy, 6(10) (10), 1163 - 1171[Refereed]Scientific journal
- Aug. 2022, Journal of Geophysical Research: Planets, 127(8) (8)Scientific journal
- Jul. 2022, Planetary Science Journal, 3(7) (7)Scientific journal
- Japan Academy, Jun. 2022, Proceedings of the Japan Academy, Series B, 98(6) (6), 227 - 282[Refereed]Scientific journal
- Jun. 2022, Minerals, 12(6) (6)Scientific journal
- Elsevier BV, Jun. 2022, Planetary and Space Science, 219, 105519 - 105519Scientific journal
- Lead, Springer Science and Business Media LLC, May 2022, Nature Geoscience, 15(6) (6), 430 - 431[Invited]Scientific journal
- Mar. 2022, Science, 375(6584) (6584), 1011 - 1016[Refereed]Scientific journal
- Feb. 2022, Icarus, 373[Refereed]Scientific journal
- Feb. 2022, Nature Astronomy, 6(2) (2), 221 - 225[Refereed]Scientific journal
- Feb. 2022, Nature Astronomy, 6(2) (2), 214 - 220[Refereed]Scientific journal
- Abstract C-type asteroids likely formed in the outer Solar System and were then scattered inwards during giant planet migration (Walsh et al., 2011). They may have transported volatiles to the inner Solar System and created the conditions suitable for life on Earth(Alexander, 2017). Carbonaceous chondrites are fragments from C-type asteroids and provide evidence that these generally organic-rich (Garvie and Buseck, 2007) bodies experienced extensive aqueous alteration early in Solar System history (Alexander et al., 2014). On 6th December 2020, ~5.4g of material was delivered to Earth from the C-type asteroid 162173 Ryugu by the Hayabusa2 spacecraft (Yada et al., 2021). Here we present the results of an integrated bulk and micro-analytical study of Ryugu particles, which provides a unique insight into the interrelationship between aliphatic-rich organics and surrounding hydrous minerals at a sub-micrometer scale. This dataset has clear implications for better understanding the origin and early evolution of Solar System organic matter and demonstrates that Ryugu particles are among the most uncontaminated extraterrestrial materials so far studied.Research Square Platform LLC, Jan. 2022, English[Refereed]Scientific journal
- Elsevier, 2022, Hayabusa2 Asteroid Sample Return Mission, 291 - 312, English[Refereed]In book
- Elsevier, 2022, Hayabusa2 Asteroid Sample Return Mission, 5 - 23, English[Refereed]In book
- Nov. 2021, ICARUS, 369, English[Refereed]Scientific journal
- Nov. 2021, ICARUS, 369, English[Refereed]Scientific journal
- Nov. 2021, ICARUS, 369, English[Refereed]Scientific journal
- Corresponding, Sep. 2021, ICARUS, 366(6) (6), 405.01, English[Refereed]Scientific journal
- Aug. 2021, Nature Astronomy, 5(8) (8), 766 - 774[Refereed]Scientific journal
- <p>The Hera mission is in development for launch in 2024 within the ESA Space Safety Program. Hera will contribute to the first deflection test of an asteroid, in the framework of the international NASA- and ESA-supported Asteroid Impact and Deflection Assessment (AIDA) collaboration. Hera will also offer a great science return.</p><p><strong>1. Introduction</strong><br />The impact of the NASA DART spacecraft on the 160 m-diameter natural satellite called Dimorphos of the binary asteroid 65803 Didymos in late September 2022 will change its orbital period around Didymos. As Didymos is an eclipsing binary, and close to the Earth on this date, the change can be detected by Earth-based observers. Before impact, DART will deploy the Italian LICIACube that will provide images of the first instants after impact. ESA&#8217;s Hera spacecraft will rendezvous Didymos four years after the impact. It will perform the measurements necessary to understand the effect of the DART impact on Dimorphos, in particular its mass, its internal structure, the direct determination of the momentum transfer and the detailed characterization of the crater left by DART.</p><p><strong>2. Planetary Defense return</strong><br />Hera will characterize in details the properties of a Near-Earth Asteroid that are fully relevant to planetary defense. Its objectives related to the deflection demonstration are the following:<br />&#8226;Measuring the mass of Dimorphos to determine the momentum transfer efficiency from DART impact.<br />&#8226;Investigating in detail the crater produced by DART to improve our understanding of the cratering process and the mechanisms by which the crater formation drives the momentum transfer efficiency.&#160;<br />&#8226;Observing subtle dynamical effects (e.g. &#160;libration imposed by the impact, orbital and spin excitation of Dimorphos) that are difficult to detect for remote observers.&#160;<br />&#8226;Characterising the surface and interior of Dimorphos to allow scaling of the momentum transfer efficiency to different asteroids.&#160;</p><p><strong>3. Science return</strong><br />Even if its requirements are driven by planetary defense, Hera will also provide unique information on many current issues in asteroid science. The reason is that our knowledge of these fascinating objects is still poor, especially for the smallest ones.&#160;The recent data obtained by the JAXA Hayabusa2 and NASA OSIRIS-REx missions have revolutionized our understanding of carbonaceous-type Near-Earth Objects. Hera has the the potential to do similar as it will rendezvous for the first time with a binary asteroid. Its secondary has a diameter of only 160 m in diameter. So far, no mission has visited such a small asteroid. Moreover, for the first time, internal and subsurface properties will be directly measured. From small asteroid internal and surface structures, through rubble-pile evolution, impact cratering physics, to the long-term effects of space weathering in the inner Solar System, Hera will have a major impact on many fields. How do binaries form? What does a 160 m-size rock in space look like? What is the surface composition? What are its internal properties? What are the surface structure and regolith mobility on both Didymos and Dimorphos? And what will be the size and the morphology of the crater left by DART, which will provide the first impact experiment at full asteroid scale using an impact speed close to the average speed between asteroids? &#160;These questions and many others will be addressed by Hera as a natural outcome of its investigations focused on planetary defense.</p><p><strong>4. Instruments</strong><br />Hera is equipped with the following payload:<br />- The Asteroid Framing Cameras are both science and navigation cameras. They will provide the target global properties as well as local geomorphology and will investigate the crater. They will also measure the mass of Dimorphos through the &#8220;wobble&#8221; motion of Didymos.<br />- The Planetary ALTimeter (PALT) will measure the distance to the target and, from close distance, derive shape and topography information complementary to the shape information in framing camera images.<br />- A thermal infrared imager (TIRI) will provide information about thermal properties and spectral information in the mid-infrared.<br />- The Hyperscout-H hyperspectral imager will provide mineralogical information in the spectral range between 450 and 950 nm.<br />- Milani is a 6 unit cubesat that will carry the ASPECT Fabry-Perot imager to derive mineralogical information, and a thermogravimeter for measuring the abundance and constraining the composition of ambient dust particles.<br />- Juventas is a 6 unit cubesat that will carry a monostatic low-frequency radar, and a gravimeter to derive interior and surface properties of the asteroids. Its landing on Dimorphos will also allow an estimate of the surface response to a very slow impact.<br />- The radioscience experiment will measure the gravity field of the Didymos system. It will work in two ways: measurements of the acceleration of the Hera spacecraft by the asteroid pair through the radio link between earth and Hera will be used as well as the intersatellite link between Hera and the two cubesat, which will measure the gravitational parameters from the relative position and velocity of the three spacecraft.</p><p><strong>5. NEO-MAPP</strong><br />NEO-MAPP (Near Earth Object Modelling and Payload for Protection) is a project funded by the H2020 program of the European Commission. Hera is its reference mission, and most of the NEO-MAPP activities are aimed at supporting the preparation of Hera. The main goal of NEO-MAPP is to provide significant advances in our modeling of impact physics, binary dynamics and internal properties, as well as in instrumentations and associated measurements by a spacecraft (including those necessary for the physical and dynamical characterization in general). In particular, innovative and synergetic measurement and data-analysis strategies are developed that combine multiple payloads, to ensure optimal data exploitation for Hera and other NEO missions.</p><p><strong>6. Conclusion</strong><br />The measurements performed by Hera will thus provide unique information on many current issues in asteroid science and therefore, the scientific legacy of the Hera mission will extend far beyond the core aims of planetary defense. Hera is thus an amazing European contribution to the international planetary defense and asteroid exploration era.</p><p><strong>Acknowledgements</strong><br />We thank ESA and CNES for support. We also acknowledge funding from the European Union&#8217;s Horizon 2020 research and innovation programme under grant agreement No 870377 (project NEO-MAPP).</p>Copernicus GmbH, Jul. 2021, Proceedings of European Planetary Science Congress 2021, 15, EPSC2021-71, EnglishInternational conference proceedings
- May 2021, COMMUNICATIONS EARTH & ENVIRONMENT, 2(1) (1), English[Refereed]Scientific journal
- Mar. 2021, Proceedings of 52nd Lunar and Planetary Science Conference, #1903, EnglishExperimental Study on Restitution Coefficients of Porous Ice Ball Simulating Saturn’s Ring ParticlesInternational conference proceedings
- Mar. 2021, Proceedings of 52nd Lunar and Planetary Science Conference, #1815, EnglishExperimental Study on Impact Craters Formed on Mountain-Like Surface Topography of AsteroidsInternational conference proceedings
- Mar. 2021, Proceedings of 52nd Lunar and Planetary Science Conference 2021, #1773, EnglishHigh Velocity Impact Experiments on Porous Ice Aggregates Simulating Cometary Nuclei Surface: Measurements of Post Shock Temperature around Impact CraterInternational conference proceedings
- Mar. 2021, Proceedings of 52nd Lunar and Planetary Science Conference, #1979, EnglishCrater Size Scaling Law and Impact-Induced Seismic Shaking on Rubble-Pile AsteroidsInternational conference proceedings
- Mar. 2021, Proceedings of 52nd Lunar and Planetary Science Conference, #1780, EnglishThree-Dimensional Tracking of Various Sized Glass Beads Ejected from Impact CraterInternational conference proceedings
- Mar. 2021, Proceedings of 52nd Lunar and Planetary Science Conference, #1158, EnglishImpact Cratering Experiments on Granular Targets Simulating Surface Layer on Asteroid 162173 Ryugu: Crater Scaling Law and Impact-Induced Seismic ShakingInternational conference proceedings
- Springer Science and Business Media LLC, Mar. 2021, Nature Astronomy, 5(3) (3), 246 - 250[Refereed]Scientific journal
- Mar. 2021, Astronomy and Astrophysics, 647[Refereed]Scientific journal
- Jan. 2021, Nature Astronomy, 5(1) (1), 39 - 45[Refereed]Scientific journal
- Jan. 2021, PLANETARY AND SPACE SCIENCE, 195, English[Refereed]Scientific journal
- Dec. 2020, Astrodynamics, 4(4) (4), 289 - 308[Refereed]Scientific journal
- Oct. 2020, Acta Astronautica, 175, 362 - 374, English[Refereed]Scientific journal
- Sep. 2020, European Planetary Science Congress, EPSC2020-808, EnglishThe effect of" MASCONS" Sphere Packing onto the Dynamical Environment around Rubble-Pile Asteroids: Application to RyuguInternational conference proceedings
- Sep. 2020, European Planetary Science Congress, EPSC2020-995, EnglishMission Status of Hayabusa2, Science Highlights, and Outlook for Sample AnalysesInternational conference proceedings
- Aug. 2020, ASTROPHYSICAL JOURNAL LETTERS, 899(1) (1), English[Refereed]Scientific journal
- May 2020, Science, 368(6491) (6491), 654 - 659[Refereed]Scientific journal
- Apr. 2020, Science, 368(6486) (6486)[Refereed]Scientific journal
- Mar. 2020, NATURE, 579(7800) (7800), 518 - 522, English[Refereed]Scientific journal
- Mar. 2020, 衝撃波シンポジウム講演論文集(CD-ROM), 2019, Japanese, Domestic magazineIn-situ flash X-ray observation of impact phenomena for rocky targetsSymposium
- Mar. 2020, ICARUS, 338, 113520, English[Refereed]Scientific journal
- Jan. 2020, ICARUS, 335, 113414, English[Refereed]Scientific journal
- 小型・分離型のカメラシステムDCAM3(分離カメラ)は,Hayabusa2が小惑星Ryugu上で衝突実験を行う際に探査機から分離され,近傍から衝突の観測を行なった.DCAM3は,イジェクタ飛散の詳細な様子を高い空間分解能で撮影するための科学観測用カメラシステム「デジタル系(DCAM3-D)」を持つ.このデジタル系は,Hayabusa2がより高いレベルの科学目的を達成するために遅れて搭載が決定されたもので,提案から開発・完成に至るまでの全てが険しい道のりだった.様々な課題を克服して成功を収めた成果は挑戦的な科学観測機器の開発の重要性を訴えている.The Japanese Society for Planetary Sciences, Sep. 2019, Planetary People - The Japanese Society for Planetary Sciences, 28(3) (3), 231 - 240, Japanese
- The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu's shape, mass, and geomorphology. Ryugu has an oblate "spinning top" shape, with a prominent circular equatorial ridge. Its bulk density, 1.19 ± 0.02 grams per cubic centimeter, indicates a high-porosity (>50%) interior. Large surface boulders suggest a rubble-pile structure. Surface slope analysis shows Ryugu's shape may have been produced from having once spun at twice the current rate. Coupled with the observed global material homogeneity, this suggests that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. From these remote-sensing investigations, we identified a suitable sample collection site on the equatorial ridge.Apr. 2019, Science (New York, N.Y.), 364(6437) (6437), 268 - 272, English, International magazine[Refereed]Scientific journal
- Mar. 2019, Proceedings of Lunar and Planetary Science Conference, 50, 1265, EnglishHigh porosity nature of the top-shape C-type asteroid 162173 Ryugu as observed by Hayabusa2International conference proceedings
- Jul. 2018, ICARUS, 309, 13 - 24, English[Refereed]Scientific journal
- 日本雪氷学会, Sep. 2017, Journal of the Japanese Society of Snow and Ice, 79(5) (5), 403 - 414, JapaneseDrag on a body moving through snow[Refereed]Scientific journal
- Jul. 2017, SPACE SCIENCE REVIEWS, 208(1-4) (1-4), 165 - 186, English[Refereed]Scientific journal
- Jul. 2017, SPACE SCIENCE REVIEWS, 208(1-4) (1-4), 187 - 212, English[Refereed]Scientific journal
- Jul. 2017, SPACE SCIENCE REVIEWS, 208(1-4) (1-4), 213 - 238, English[Refereed]Scientific journal
- Jul. 2017, SPACE SCIENCE REVIEWS, 208(1-4) (1-4), 125 - 142, English[Refereed]Scientific journal
- Jul. 2017, SPACE SCIENCE REVIEWS, 208(1-4) (1-4), 213 - 238, English[Refereed]Scientific journal
- Mar. 2017, Proceedings of Lunar and Planetary Science Conference, 48, 1552, EnglishThermal conductivity model for powdered materials under vacuum based on experimental studiesInternational conference proceedings
- Mar. 2017, Proceedings of Lunar and Planetary Science Conference, 48, 1887, EnglishThermal conductivity measurement of sintered glass beads and implication for thermal evolution of planetesimalInternational conference proceedings
- 2017, Space Science Review, 1 - 18, English[Refereed]Scientific journal
- Jan. 2017, AIP ADVANCES, 7(1) (1), 015310, English[Refereed]Scientific journal
- Jun. 2016, METEORITICS & PLANETARY SCIENCE, 51(6) (6), 1153 - 1162, English[Refereed]Scientific journal
- Mar. 2016, ICARUS, 267, 1 - 11, English[Refereed]Scientific journal
- Feb. 2016, 宇宙航空研究開発機構研究開発報告, JAXA-RR-15-005, 1 - 14, JapaneseHayabusa2 分離カメラ用硝材のガンマ線照射試験[Refereed]Research institution
- Dec. 2015, ICARUS, 262, 79 - 92, English[Refereed]Scientific journal
- Nov. 2015, ICARUS, 260, 320 - 331, English[Refereed]Scientific journal
- Jul. 2015, Proceedings of International Symposium on Space Technology and Science, 30, 2015 - k-64, EnglishScientific camera system in Hayabusa2 DCAM3: Its objective and system configuration for observation of SCI asteroid impact experimentInternational conference proceedings
- Apr. 2015, ICARUS, 250, 215 - 221, English[Refereed]Scientific journal
- Mar. 2015, Proceedings of Lunar and Planetary Science Conference, 46, 2392, EnglishHayabusa2 Deployable Camera 3 (DCAM3) for impact experiment on asteroid: Scientific observation plan and instrument performanceInternational conference proceedings
- Jul. 2014, The proceedings of Asteroids, Comets, Meteors (ACM) 2014, EnglishExperimental study on the ejecta-velocity distributions caused by low-velocity impacts on quartz sandInternational conference proceedings
- Jun. 2014, ICARUS, 235, 147 - 155, English[Refereed]Scientific journal
- May 2014, ICARUS, 233, 293 - 305, English[Refereed]Scientific journal
- Mar. 2014, Proceedings of Lunar and Planetary Science Conference, 45, 1768, EnglishLarge scale impact experiments simulating Small Carry-On Impactor (SCI) equipped on Hayabusa-2International conference proceedings
- 2014, GEOCHEMICAL JOURNAL, 48(6) (6), 571 - 587, English[Refereed]Scientific journal
- The Japanese Society for Planetary Sciences, Nov. 2013, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2013, "O8 - 06", Japaneseカンラン岩ターゲットへの高速度衝突により放出される破片の3次元形状分布(口頭発表セッション8(衝突),口頭発表)Scientific journal
- Jul. 2013, ICARUS, 225(1) (1), 298 - 307, English[Refereed]Scientific journal
- Mar. 2013, Proceedings of 44th Lunar and Planetary Science Conference, 44, 1904, EnglishSmall Carry-On Impactor (SCI): Its Scientific Purpose, Operation, and Observation Plan in Hayabysa-2 MissionInternational conference proceedings
- Mar. 2013, The proceedings of 44th Lunar and Planetary Science Conference, abstract 1032, EnglishIn situ flash X-ray observation of crater formation in porous gypsum analogous to low-density asteroidsInternational conference proceedings
- Mar. 2013, The proceedings of 44th Lunar and Planetary Science Conference, abstract 1682, EnglishExperimental study on impact disruption of rocky rubble-pile bodies: Effect of disruption of constituent boulders on reaccumulation processInternational conference proceedings
- 2013, IFSA 2011 - SEVENTH INTERNATIONAL CONFERENCE ON INERTIAL FUSION SCIENCES AND APPLICATIONS, 59, English[Refereed]International conference proceedings
- 宇宙科学研究所, 2013, 平成24年度スペースプラズマ研究会・講演集, 2012, 23 (2pp), Japanese堆積岩への斜め衝突クレーター形成実験Symposium
- 2013, 月・惑星シンポジウム予稿, 46, Japaneseガラスビーズ焼結体のネックの成長による熱伝導率の変化Symposium
- 2013, 月・惑星シンポジウム予稿, 46, Japaneseガラスビーズの熱伝導率測定実験: 粒径分布依存性Symposium
- Nov. 2012, ICARUS, 221(2) (2), 646 - 657, English[Refereed]Scientific journal
- Sep. 2012, ICARUS, 221(1) (1), 310 - 319, English[Refereed]Scientific journal
- Aug. 2012, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 117, English[Refereed]Scientific journal
- May 2012, The proceedings of Asteroids, Comets, Meteors 2012, abstract 6204, EnglishThe effects of multiple impacts on the impact strength of ice targetsInternational conference proceedings
- May 2012, ICARUS, 219(1) (1), 336 - 344, English[Refereed]Scientific journal
- May 2012, The proceedings of Asteroids, Comets, Meteors 2012, abstract 6094, EnglishLow-velocity impact experiments of ice and porous gypsum simulating equal-sized planetesimal collisionsInternational conference proceedings
- May 2012, The proceedings of Asteroids, Comets, Meteors 2012, abstract 6041, EnglishIn-situ flash X-ray observation of projectile penetration and crater formation in porous asteroid analogueInternational conference proceedings
- May 2012, Proceedings of Asteroids, Comets, Meteors 2012, 11, 6137, EnglishHayabusa-2, C-type asteroid sample return mission, science targets and instrumentsInternational conference proceedings
- Apr. 2012, ICARUS, 218(2) (2), 751 - 759, English[Refereed]Scientific journal
- Apr. 2012, ICARUS, 218(2) (2), 737 - 750, English[Refereed]Scientific journal
- Mar. 2012, The proceedings of 44th Lunar and Planetary Symposium, 44_17, EnglishImpact experiments of porous gypsum-glass bead mixtures simulating parent bodies of ordinary chondritesSymposium
- 2012, Proceedings of the International Astronautical Congress, IAC, 3, 1654 - 1659Development status of small carry-on impactor for hayabusa-2 missionInternational conference proceedings
- 2012, SHOCK COMPRESSION OF CONDENSED MATTER - 2011, PTS 1 AND 2, 1426, 847 - 850, English[Refereed]International conference proceedings
- 2012, 平成23年度スペースプラズマ研究会・講演集, 2011, 30 (3pp), Japanese堆積岩を使った衝突クレーター形成実験Symposium
- 2012, 宇宙科学技術連合講演会講演集, 56, Japaneseはやぶさ 2 搭載分離カメラによる衝突実験観測ミッションについてSymposium
- 2012, Journal of Geophysical Research E: Planets, 117(8) (8), English[Refereed]Scientific journal
- Nov. 2011, ICARUS, 216(1) (1), 1 - 9, English[Refereed]Scientific journal
- Aug. 2011, ICARUS, 214(2) (2), 754 - 765, English[Refereed]Scientific journal
- Jun. 2011, ASTROPHYSICAL JOURNAL LETTERS, 733(2) (2), English[Refereed]Scientific journal
- Jun. 2011, Astrophys. J., 733(2,Pt.2) (2,Pt.2), 1 - 39, English[Refereed]Scientific journal
- May 2011, Astrophys. J.,, 733(2,Pt.2) (2,Pt.2), 1 - 39, English[Refereed]Scientific journal
- Hokkaido University Press, Japan, May 2011, Physics and Chemistry of Ice, 339 - 344, EnglishMeasurements of post shock temperature deposited in ice impact crater[Refereed]Research society
- Hokkaido University Press, Japan, May 2011, Physics and Chemistry of Ice, 379 - 386, EnglishImpact experiments on sintered snowballs[Refereed]Research society
- Hokkaido University Press, Japan, May 2011, Physics and Chemistry of Ice, 387 - 395, EnglishFlow law of ice-silica mixtures and the effects of silica content and porosity[Refereed]Research society
- Mar. 2011, The proceedings of 42nd Lunar and Planetary Science Conference, abstract 1131, EnglishImpact experiments of gypsum-glass beads mixtures simulating parent bodies of ordinary chondritesInternational conference proceedings
- Feb. 2011, ICARUS, 211(2) (2), 986 - 992, English[Refereed]Scientific journal
- 2011, 日本惑星科学会誌, 20, 350 - 366, Japanese「月惑星探査の来たる10年」検討・第一段階報告[Refereed]Scientific journal
- 2011, 平成22年度スペースプラズマ研究会・講演集, 26 (4pp), Japanese砂岩に対する衝突クレーター形成実験:弾丸密度の効果International conference proceedings
- Dec. 2010, ICARUS, 210(2) (2), 956 - 967, English[Refereed]Scientific journal
- Jun. 2010, ICARUS, 207(2) (2), 972 - 977, English[Refereed]Scientific journal
- Apr. 2010, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 115, English[Refereed]Scientific journal
- Mar. 2010, The proceedings of 41st Lunar and Planetary Science Conference, abstract 1618, EnglishMechanical strength of small icy bodies with residual porosity less than 30 %International conference proceedings
- Mar. 2010, The proceedings of 41st Lunar and Planetary Science Conference, abstract 1630, EnglishExperimental study on the collisional disruption of sintered snowball with various porosityInternational conference proceedings
- Mar. 2010, 41st LPSC, p. 1194, EnglishEjecta size distribution from hypervelocity impact cratering of planetary materialsInternational conference proceedings
- Dec. 2009, METEORITICS & PLANETARY SCIENCE, 44(12) (12), 1947 - 1954, English[Refereed]Scientific journal
- Sep. 2009, Journal of Geophysical Research E: Planets, 114(9) (9), English[Refereed]Scientific journal
- Sep. 2009, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 114, English[Refereed]Scientific journal
- Apr. 2009, ICARUS, 200(2) (2), 694 - 697, English[Refereed]Scientific journal
- Mar. 2009, The proceedings of the 41st Lunar and Planetary Symposium, 23 - 26, EnglishImpact experiments on sintered snow sphere: Implication for disruption and accumulation of small icy bodiesSymposium
- Mar. 2009, The proceedings of the 41st Lunar and Planetary Symposium, 1 - 4, EnglishExperimental study on the rheological properties of ice-silica mixtures: Dependence of the temperature on the flow law and brittle-ductile transitionSymposium
- 2009, EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY, 1158, 115 - 116, EnglishExperimental Study on the Sticking Velocity of Rimmed ChondrulesInternational conference proceedings
- 2009, 遊星人(日本惑星科学会学会誌), 18(1) (1), 10 - 17, Japanese熱進化した岩石微惑星の衝突破壊に関する実験的研究[Refereed]Scientific journal
- 2009, Proc. of the 41st ISAS Lunar Planetary Symp., 31 - 34, EnglishExperimental study on impact craters formed on the oceanic crust: Effects of sediment-covering oceanic basalt on the crater formationResearch institution
- 2009, SHOCK COMPRESSION OF CONDENSED MATTER - 2009, PTS 1 AND 2, 1195(Pt.2) (Pt.2), 875 - +, English[Refereed]International conference proceedings
- Dec. 2008, METEORITICS & PLANETARY SCIENCE, 43(12) (12), 2027 - 2048, English[Refereed]Scientific journal
- Nov. 2008, Journal of Geophysical Research E: Planets, 113(11) (11), 11002, English[Refereed]Scientific journal
- Nov. 2008, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 113(E11) (E11), English[Refereed]Scientific journal
- Oct. 2008, ICARUS, 197(2) (2), 621 - 626, English[Refereed]Scientific journal
- Oct. 2008, ICARUS, 197(2) (2), 627 - 637, English[Refereed]Scientific journal
- Jul. 2008, ADVANCES IN SPACE RESEARCH, 42(2) (2), 305 - 309, English[Refereed]Scientific journal
- American Geophysical Union, Jun. 2008, Geophysical Research Letters, 35(12) (12), 12206, English[Refereed]Scientific journal
- Jun. 2008, GEOPHYSICAL RESEARCH LETTERS, 35(12) (12), 12206, English[Refereed]Scientific journal
- May 2008, The proceedings of the Science of Solar System Ices: A Cross-Disciplinary Workshop, abstract 9016, EnglishExperimental study on the rheology of ice-silica beads mixtures: effects of silica content and temperature on the flow lawInternational conference proceedings
- Mar. 2008, The proceedings of the 40th ISAS Lunar and Planetary Symposium, 118 - 123, EnglishMeasurements of post shock temperature deposited in ice impact craterSymposium
- Feb. 2008, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 113(E2) (E2), 2013, English[Refereed]Scientific journal
- 2008, 5TH INTERNATIONAL CONFERENCE ON INERTIAL FUSION SCIENCES AND APPLICATIONS (IFSA2007), 112(Part 4) (Part 4), EnglishInternational conference proceedings
- 2008, EARTH PLANETS AND SPACE, 60(4) (4), 277 - 281, EnglishInstrumentation and performance evaluation of the XRS on SELENE orbiter[Refereed]Scientific journal
- Mar. 2007, The proceedings of the 39th ISAS Lunar and Planetary Symposium, 194 - 197, EnglishMechanical strength and flow properties of ice-silicate mixture depending on the silicate contents and the silicate particle sizesSymposium
- 2007, Earth, Planets and Space, 59(4) (4), 319 - 324[Refereed]Scientific journal
- 2007, ADVANCES IN SPACE RESEARCH, 39(3) (3), 392 - 399, English[Refereed]Scientific journal
- 2007, LPSC XXXVIII, 1708, EnglishFragment velocity distribution of core-mantle bodies in collisional distributionInternational conference proceedings
- 2007, PHYSICS AND CHEMISTRY OF ICE, 13 - 25, EnglishExtraterrestrial ice with emphasis on aggregation/interaction with organic matter: Collisional and accretional properties of model particles[Refereed][Invited]International conference proceedings
- 2007, Proc. 39th ISAS Lunar and Planetary Symp., 190 - 193, EnglishExperimental Study on Collisional Disruption of Core-mantle BodiesResearch institution
- 2007, EARTH PLANETS AND SPACE, 59(4) (4), 319 - 324, English[Refereed]Scientific journal
- 2007, PHYSICS AND CHEMISTRY OF ICE, 649 - 657, EnglishMechanical strength and flow properties of ice-silicate mixture depending on the silicate contents and the silicate particle sizes[Refereed]International conference proceedings
- Oct. 2006, The proceedings of 4th International Conference on Mars Polar Science and Exploration, Abstract 8006, EnglishMechanical strength of ice-silicate mixture depending on the silicate contents and the silicate particle sizesInternational conference proceedings
- Mar. 2006, Proceedings of Lunar and Planetary Science Conference, 38, 2244, EnglishDevelopment of X-ray fluorescence spectrometer onboard SELENEInternational conference proceedings
- THE JAPANESE SOCIETY OF SNOW AND ICE, 2006, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 31 - 31, Japanese
- THE JAPANESE SOCIETY OF SNOW AND ICE, 2006, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 30 - 30, Japanese
- 2006, 37th Annual Lunar and Planetary Science Conference, EnglishMeasurement of Compressive and Tensile Strength of Ice-Silicate MixturesScientific journal
- Compression measurements were conducted by using a rod to penetrate high-density snow, which is defined as snow with a bulk density larger than the maximum packing density.Two types of deformation were recognized plastic-type and destructive-type deformations.In the plastictype deformation, the relation between the stress and strain rates was nonlinear, hence, this deformation is not Newtonian and is expressed by a power law.This suggests that in addition to the particle rearrangement operative in low-density snow, plastic-type deformation and destruction of ice particles are also important.The critical penetration speeds between the two deformation types were 0.33∼0.83, 0.83∼1.67 and 1.67∼3.33 mm/s for snow densities of 550, 640 and 730kg/m3, respectively.The power increased with density and approached 3, which correspond to that required for penetrating ice.The elastic modulus estimated from the slopes of the saw-tooth records was 100MPa∼1GPa, which increased with speed and density.Further, the destructive strength was 0.2∼8MPa, which also increased with density.The Japanese Society of Snow and Ice, 2006, 雪氷(日本雪氷学会学会誌), 68(2) (2), 123 - 130, Japanese[Refereed]Scientific journal
- 日本雪氷学会, 2006, 雪氷(日本雪氷学会学会誌), 68(2) (2), 131 - 139, Japanese[Refereed]Scientific journal
- Dec. 2005, ICARUS, 179(1) (1), 274 - 288, English[Refereed]Scientific journal
- Oct. 2005, PHYSICAL REVIEW E, 72(4) (4), 1 - 45106, English[Refereed]Scientific journal
- Feb. 2005, ICARUS, 173(2) (2), 295 - 299, English[Refereed]Scientific journal
- 2005, LPSC XXXVI, 2101, EnglishIs Chaos on Europa caused by crust-penetrating impacts?International conference proceedings
- Jul. 2004, ICARUS, 170(1) (1), 193 - 201, English[Refereed]Scientific journal
- 2004, Proc. 37th ISAS Lunar and Planetary Symp., 25 - 28, EnglishImpact crater formed on sintered snow: implication for the crater on cometsResearch institution
- 2004, Proc. 37th ISAS Lunar and Planetary Symp., 37 - 40, EnglishBreakup of molten silicate by high-velocity gas flowResearch institution
- Jan. 2004, JOURNAL OF APPLIED PHYSICS, 95(1) (1), 134 - 139, English[Refereed]Scientific journal
- Non-rotation-type friction experiments were carried out to measure the friction coefficients of ice at sliding velocities from 10-7 to 10-3m/s, normal stresses from 123 to 368kPa, and temperature of-10°C.With decreasing sliding velocity from 10-4 to 10-7m/s the ice-ice.friction coefficient increased from 0.1 to 1.0. On the other hand, the ice-glass friction coefficient decreased from 0.04 at 10-3m/s to 0.02 at 10-5m/s, and ice-granite friction coefficient showed a little increase at first and then decrease when the velocity was decreased from 10-3 to 10-6m/s. The increase of ice-ice friction coefficient with decreasing velocity cannot be explained by the traditional adhesion mechanism developed in metallurgy. The ice-ice friction was characterized by the smooth sliding and stick-slip sliding, and the latter changed to smooth sliding at lower velocities. However, no stick-slip phenomena were observed in ice-glass and icegranite friction at all the velocities studied. The above observed sliding velocity dependence of ice friction was explained by the new adhesion shear theory presented by Maeno and Arakawa, which takes account of ice sintering at lower sliding velocities and higher temperatures.The Japanese Society of Snow and Ice, Jul. 2003, Journal of the Japanese Association of Snow and Ice, 65(4) (4), 389 - 397, Japanese
- Jan. 2003, Canadian Journal of Physics, 81(1-2) (1-2), 159 - 166, English[Refereed]Scientific journal
- Jan. 2003, Canadian Journal of Physics, 81(1-2) (1-2), 209 - 216, English[Refereed]Scientific journal
- Jan. 2003, Canadian Journal of Physics, 81(1-2) (1-2), 241 - 249, English[Refereed]Scientific journal
- Dec. 2002, METEORITICS & PLANETARY SCIENCE, 37(12) (12), 1975 - 1983, EnglishThe role of sticky interstellar organic material in the formation of asteroidsScientific journal
- Based on experiments that model interstellar organic materials, we found that both C and N contents and IR spectra of insoluble organic materials in carbonaceous chondrites could be reproduced well by the aqueous alteration and the subsequent thermal metamorphism. The resulting sample shows strong evidence of diamond, which indicates that this process is an unexpeccted mechanism that might produce extensive amount of diamond in meteorites' parent bodies. Because this process requires neither high pressures nor energetic processes, the present results suggest an alternate origin of diamonds in meteorites.日本学士院, Dec. 2002, Proceedingd of the Japan Academy, 78(Ser.B) (Ser.B), 277 - 781, English
- 太陽系の外惑星領域に存在する氷衛星の表面にはクレーター地形が普遍的に存在する.このクレーターは小天体が高速度で衝突することにより形成される.天体同士の衝突は太陽系において頻繁に起こる現象であり,その起源や進化に決定的に重要な役割を果たしている.現在,氷の衝突物性を研究するため衝突速度100m/s~4km/sという広い範囲で,低温室において衝突実験が行われている.氷内部に設置した圧力ゲージや超高速度カメラを用いたその場観測により,衝突破壊に関する素過程が明らかになってきた.衝突最大破片,サイズ分布等,衝突破壊に関する多くの特徴は無次元衝突応力と良い相関がある.この無次元衝突応力は衝突試料に生じた反対点での圧力と物質強度の比であり,衝撃波の発生と伝播・減衰により記述される.氷は衝突点近傍では距離の-1乗で圧力が減衰し,衝撃圧力が150~300MPa以上では高圧相氷が発生し,その衝撃波形に影響を及ぼす.氷天体は衝突破壊後,その天体サイズと衝突条件に従って重力により再集積が起こるが,これらの実験的研究は,その条件を求めるために用いられる.The Japanese Society of Snow and Ice, May 2002, Journal of the Japanese Association of Snow and Ice, 64(3) (3), 259 - 267, Japanese
- Mar. 2002, PHYSICAL REVIEW E, 65(3) (3), English[Refereed]Scientific journal
- Feb. 2002, ASTROPHYSICAL JOURNAL, 566(2) (2), L121 - L124, EnglishRapid growth of asteroids owing to very sticky interstellar organic grains[Refereed]Scientific journal
- 2002, Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 65(3) (3), English[Refereed]Scientific journal
- Elsevier, 2002, Icarus, 158(2) (2), 516 - 531, English[Refereed]Scientific journal
- Aug. 2001, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 106(E8) (E8), 17567 - 17578, EnglishShock pressure attenuation in water ice at a pressure below 1 GPa[Refereed]Scientific journal
- Feb. 2000, GEOPHYSICAL RESEARCH LETTERS, 27(3) (3), 305 - 308, EnglishShock wave and fracture propagation in water ice by high velocity impact[Refereed]Scientific journal
- Friction experiments were done to measure the kinetic friction coefficient between ice and ice at velocities from 10-4 to 10-1 m/s and temperatures from-1 to-27°C. It was found that at all temperatures tested, the ice-ice friction coefficient increased with the decrease in velocity;e.g., from 0.01 at 10-1m/s to 0.15 at 10-4m/s at -12°C, and that the friction coefficient showed minimum values at -5°C. The stick-slip phenomenon was observed at lower velocities than 5×10-4m/s(-12°C)and 10-3 m/s(-27°C). No dependence on the load, that is the normal stress applied between ice and ice, was noted in the range tested in the experiment, 2.9 to 6.7 kPa. Most of the obtained results can be explained by the theory of lubrication of water produced by frictional heating.The Japanese Society of Snow and Ice, Nov. 1999, Journal of the Japanese Association of Snow and Ice, 61(6) (6), 437 - 443, Japanese
- Nov. 1999, Icarus, 142(1) (1), 34 - 45, English[Refereed]Scientific journal
- 太陽系には広い領域で氷が存在する.特に外惑星領域に存在する氷衛星は厚さ100kmを超える氷のマントルを持ち,現在でも活発に活動している可能性がある.ガリレオ探査機による新しい観測結果は,木星のガリレオ衛星であるエウロバ,ガニメデに固有磁場があることを明らかにした.またエウロパでは氷地殻の下に水の"海"が隠れていることを示す多くの証拠写真を送ってきた.これら氷天体の形成過程や進化を理解するためには惑星環境下における氷の物性が必要である.低温,高圧,低歪速度,高速度変形等の極端環境下における新しい氷の研究が,氷天体の研究発展には重要であると思われる.The Japanese Society of Snow and Ice, May 1999, Journal of the Japanese Association of Snow and Ice, 61(3) (3), 215 - 220, Japanese
- Elsevier Ltd, 1999, Advances in Space Research, 23(7) (7), 1217 - 1224, English[Refereed]Scientific journal
- Jun. 1998, Icarus, 133(2) (2), 310 - 320, English[Refereed]Scientific journal
- Mar. 1998, GEOPHYSICAL RESEARCH LETTERS, 25(6) (6), 837 - 840, EnglishIn-situ mass spectrometric observation of impact vaporization of water-ice at low temperatures[Refereed]Scientific journal
- Elsevier, 1997, Cold Regions Science and Technology, 26(3) (3), 215 - 229, English[Refereed]Scientific journal
- Elsevier Ltd, 1996, Planetary and Space Science, 44(9) (9), 917 - 925, English[Refereed]Scientific journal
- Elsevier Ltd, 1996, Planetary and Space Science, 44(9) (9), 901 - 908, English[Refereed]Scientific journal
- Dec. 1995, ICARUS, 118(2) (2), 341 - 354, EnglishEjection velocity of ice impact fragments[Refereed]Scientific journal
- 1995, Geophysical Research Letters, 22(15) (15), 2005 - 2008, English[Refereed]Scientific journal
- 1995, Icarus, 113(2) (2), 423 - 441, English[Refereed]Scientific journal
- The Volcanological Society of Japan, 1994, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 1994, 166 - 166, Japanese
- 1994, Geophysical Research Letters, 21(14) (14), 1515 - 1518, English[Refereed]Scientific journal
- The Geological Society of Japan, May 1989, Journal of the Geological Society of Japan, 95(5) (5), 405 - 408, Japanese
- Temperature measurement at the bottom of craters on porous ice formed by high-speed oblique impactレポート番号: 27宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS), Feb. 2024, Proceedings of 2024 Symposium on Laboratory Experiment for Space Science, Japanese
- ⼩惑星模擬物質の⾼速度衝突実験:衝突残留温度分布の物質強度依存性—High-Velocity Impact Experiments on Porous Gypsum-Sand Mixtures Simulating Asteroids: Effect of Material Strength on Post-Shock Temperature Distribution令和4年度宇宙科学に関する室内実験シンポジウム(2023年3月6日-7日. オンライン開催) 2023 Symposium on Laboratory Experiment for Space Science (March 6-7, 2023. Online Meeting) 資料番号:SA6000187029 レポート番号: 29宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Mar. 2023, 令和4 年度宇宙科学に関する室内実験シンポジウム講演集 = Proceedings of 2023 Symposium on Laboratory Experiment for Space Science, Japanese
- 2023, 日本地球惑星科学連合大会予稿集(Web), 2023Experimental study on cratering processes of porous icy satellites experienced densification
- 2023, 日本地球惑星科学連合大会予稿集(Web), 2023Impact cratering on wet sand: Effect of water content and implications for crater formation on habitable bodies
- 2023, 日本惑星科学会秋季講演会予稿集(Web), 2023レゴリスに覆われた基盤岩標的へのクレーター形成実験:クレーター形態と衝突励起振動の計測
- 2023, 日本惑星科学会秋季講演会予稿集(Web), 2023クレーター形成に伴う周辺大気の温度変化
- 2023, 日本惑星科学会秋季講演会予稿集(Web), 2023衝突クレーター形成に伴う地下から放出されるボルダーの速度スケール則
- 2023, 日本惑星科学会秋季講演会予稿集(Web), 2023Pattern in ejecta curtain generated by the impact into granular targets of various sized particles
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022ハビタブル天体表面を模擬した含水砂標的への斜め衝突実験
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022コア・マントル構造を持つ含水小天体の衝突破壊と破片速度分布:標的内部の粒子速度分布の計測
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022多孔質氷球の反発係数:塑性変形を考慮した非弾性衝突モデルの応用
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022氷・雪クレーター形成実験:クレーターサイズ・スケール則と運動量輸送に対する空隙の影響
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022レゴリスに覆われた基盤岩へのクレーター形成実験:衝突励起振動による物質移動との関連
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022衝突クレーター形成に伴う地下からのボルダー放出に関する実験的研究
- 2022, 日本惑星科学会秋季講演会予稿集(Web), 2022起伏表面に適用可能なクレータースケール則とクレーターの崩壊に関する実験的研究
- 2022, 日本地球惑星科学連合大会予稿集(Web), 2022Impact experiments on a target simulating the surface of a rubble-pile asteroid: Effects of weak-strength coarse-grained regolith on crater size and impact-induced seismic shaking
- 2022, 日本地球惑星科学連合大会予稿集(Web), 2022Experimental study related to impact phenomena on habitable planets: High-velocity impact experiments on wet sand targets under atmospheric pressure
- 2022, 日本地球惑星科学連合大会予稿集(Web), 2022Thermal infrared observation of hot ejecta and impact crater on porous ice formed by high-velocity impacts
- 2022, 日本地球惑星科学連合大会予稿集(Web), 2022Effects of crater collapse and asymmetric ejecta curtains on the celestial surface.
- 2022, 日本地球惑星科学連合大会予稿集(Web), 2022Effect of porosity and multiple impacts on restitution coefficient and sticking properties of snowball simulating Saturn’s rings
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021氷微惑星上の高速衝突により発生する衝突残留熱の定量的評価
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021熱進化した氷微惑星の斜め衝突に関する実験的研究
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021多孔質氷球の超低速度衝突における非弾性衝突メカニズムと付着境界速度
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021レゴリス起伏地形の緩和に対するクレーターと非対称エジェクタカーテンの影響
- 2021, 日本地球惑星科学連合大会予稿集(Web), 2021Effect of porosity on restitution coefficient and sticking properties of snowball simulating Saturn’s rings
- 2021, 日本地球惑星科学連合大会予稿集(Web), 2021High-velocity impact experiments on porous ice with a porosity less than 30%: Momentum transport and crater formation processes
- 2021, 日本地球惑星科学連合大会予稿集(Web), 2021Catastrophic disruption of layered targets simulating parent bodies of C-type asteroids: Development of Measurement Method of Velocity Distribution for Impact Fragments by Digital Image Correlation Method
- 2021, 日本地球惑星科学連合大会予稿集(Web), 2021High velocity impact experiments on porous ice aggregates simulating cometary nuclei: Estimation of energy partition from projectile kinetic energy to post shock heat
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021はやぶさ2探査と微惑星形成
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021層構造含水微惑星の模擬物質への衝突実験:デジタル画像相関法による標的内部の粒子速度分布の計測
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021小惑星上の低強度粗粒レゴリス層を伝播する衝突励起地震波
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021ラブルパイル天体上の衝突クレーターからのボルダー放出過程
- 2021, 日本惑星科学会秋季講演会予稿集(Web), 2021フラッシュX線による衝突破片の速度-質量分布の計測:粘土を用いた延性標的の衝突破壊実験
- 2021, 宇宙科学技術連合講演会講演集(CD-ROM), 65thHayabusa2 Science Achievement Digest
- 2020, 日本地球惑星科学連合大会予稿集(Web), 2020Cratering experiments on snow at very low temperature: Scaling law of crater size in gravity regime
- 2020, 日本地球惑星科学連合大会予稿集(Web), 2020Effect of oblique impact on impact strength of icy planetesimals
- 2020, 日本地球惑星科学連合大会予稿集(Web), 2020Effect of porosity on restitution coefficients of snowball simulating Saturn’s ring: implication for inelastic collision
- 2020, 日本地球惑星科学連合大会予稿集(Web), 2020Experimental study on impact disruption for low strength target and implication for effect of tensile strength on impact strength
- 2020, 日本地球惑星科学連合大会予稿集(Web), 2020Measurements of post shock temperature of impact crater formed on porous ice
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020衝突残留熱と小惑星母天体の熱変成過程に関する実験的研究
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020低強度標的を用いた高速度衝突破壊実験:衝突破壊強度と引っ張り強度の関係
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020土星リング粒子を模擬した多孔質氷球の非弾性衝突メカニズムに関する実験的研究
- 2020, 日本地球惑星科学連合大会予稿集(Web), 2020Crater scaling laws of ejecta velocity distribution and crater size constructed for very low strength target
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020フラッシュX線による衝突破片の速度-質量分布の計測:粘土を用いた延性標的の衝突破壊実験
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020小惑星の起伏地形におけるクレーター形成過程に関する実験的研究
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020ラブルパイル天体に適用可能なクレータースケール則と衝突励起振動に関する実験的研究
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020クレーター形成時のエジェクタ放出過程におけるサイズごとの三次元粒子追跡
- 2020, 衝撃波シンポジウム講演論文集(CD-ROM), 2019Estimation on the Size Distribution of Forward Debris from the Small Carry-on Impactor (SCI) onboard Hayabusa2
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020多孔質氷天体を模擬したクレーター形成実験:衝突残留熱の計測
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020「はやぶさ2」搭載分離カメラDCAM3によりSCI衝突実験時に観測された放出ボルダ
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020はやぶさ2SCIによる人工クレーター形成に伴う小惑星リュウグウの再表面化過程
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020DCAM3D画像を用いた小惑星Ryuguの形状モデル
- 2020, 日本惑星科学会秋季講演会予稿集(Web), 2020はやぶさ2のリュウグウ近傍観測の科学成果
- 2019, 日本地球惑星科学連合大会予稿集(Web), 2019小惑星表面を模擬した砂・石膏標的を用いた高速度クレーター形成実験
- 2019, 日本地球惑星科学連合大会予稿集(Web), 2019高空隙多孔質氷の圧密過程に関する実験的研究:氷レゴリス層の密度進化過程への応用
- 2019, 日本地球惑星科学連合大会予稿集(Web), 2019土星リング粒子を模擬した多孔質氷球の衝突過程に関する実験的研究
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019土星リング粒子を模擬した多孔質氷球の反発及び付着に関する実験的研究
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019低強度標的を用いたクレーター形成実験 エジェクタ放出過程の解析
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019多孔質氷天体を模擬した雪のクレーター形成実験:衝突溶融と衝突残留熱に関する研究
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019In-situ observation of ejecta curtain in space impact experiment on the asteroid Ryugu
- 2019, 日本地球惑星科学連合大会予稿集(Web), 2019小惑星Ryugu表層を模擬した低強度粗粒レゴリスの衝突実験
- 2019, 日本地球惑星科学連合大会予稿集(Web), 2019サイズ分布をもつガラスビーズ層へのクレーター形成実験:小惑星Ryuguのクレーター形成過程の解明
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019小惑星のレゴリス層を模擬したサイズ頻度分布を持つガラスビーズ標的へのクレーター形成実験
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019フラッシュX線を用いた衝突破壊現象の観測:多孔質標的の破片速度分布に対する空隙の効果
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019リュウグウ表層を模擬した低強度粗粒標的に対するクレーター形成実験
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019はやぶさ2衝突装置によって生成されたイジェクタカーテンの解析から推定される小惑星リュウグウの表層物性
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019はやぶさ2SCIによる小惑星リュウグウ上での衝突実験
- 2019, 日本天文学会年会講演予稿集, 2019小惑星探査ミッション「はやぶさ2」のこれまでの成果
- 2019, 日本惑星科学会秋季講演会予稿集(Web), 2019探査機はやぶさ2のリュウグウ近傍探査の総括
- 2018, 日本地球惑星科学連合大会予稿集(Web), 2018氷微惑星を模擬した氷球の斜め衝突実験
- 2018, 日本地球惑星科学連合大会予稿集(Web), 2018C型小惑星を模擬した多孔質石膏の高速度衝突実験:衝突クレーター近傍の衝突残留熱のその場計測
- 2018, 日本地球惑星科学連合大会予稿集(Web), 2018多孔質氷天体上への高速度クレーター形成実験:クレーターサイズスケール則に対する衝突溶融度の影響
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018高空隙率シリカ層への衝突実験とクレータリングにおける空隙率の効果
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018多孔質氷球の反発係数の空隙率依存性:土星リング粒子の衝突過程に関する実験的研究
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018多孔質氷への高速度クレーター形成実験:クレーターサイズスケール則に対する衝突溶融の影響
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018多孔質天体上に形成する衝突クレーター周囲の衝突残留温度に関する実験的研究
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018異なる粒径をもつ粒子の混合層へのクレーター形成実験:小惑星Ryugu上のクレーター地形との比較
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018低強度粗粒レゴリスを用いた衝突実験:クレータースケール則と衝突励起振動に対する粒子強度の影響
- 2018, 日本惑星科学会秋季講演会予稿集(Web), 2018多孔質氷の圧縮変形における圧密速度と空隙率の関係:氷微惑星の密度構造への応用
- 2018, 日本地球惑星科学連合大会予稿集(Web), 2018フラッシュX線を用いた凍結粘土の衝突破壊過程のその場観察
- 2018, 日本地球惑星科学連合大会予稿集(Web), 2018Searching SCI craters: Results of a Hayabusa2 landing site selection dry-run
- 2017, 日本惑星科学会秋季講演会予稿集(Web), 2017火星衛星探査計画のための分離カメラ(MMX-DCAM5)の検討状況
- 2017, 日本地球惑星科学連合大会予稿集(Web), 2017石英砂への高速度クレーター形成実験:クレーターサイズとエジェクタ速度分布スケール則構築
- 2017, 日本惑星科学会秋季講演会予稿集(Web), 2017フラッシュX線を用いた衝突破壊現象の観測
- 2017, 日本惑星科学会秋季講演会予稿集(Web), 2017クレーターイジェクタのスケール則に対する衝突速度依存性
- 2017, 日本惑星科学会秋季講演会予稿集(Web), 2017雪標的に作られる衝突クレーター地形
- Jun. 2016, ICARUS, 271, 472 - 472, EnglishOthers
- 2016, 日本地球惑星科学連合大会予稿集(Web), 2016衝突貫入時の加速度計測による惑星表面の力学的性質の調査
- 2016, 日本惑星科学会秋季講演会予稿集(Web), 2016石英ガラス球の衝突破壊実験における斜め衝突の効果
- 2016, 日本惑星科学会秋季講演会予稿集(Web), 2016ペネトレータを用いた天体表層の物性探査
- 2016, 日本地球惑星科学連合大会予稿集(Web), 2016凍結砂を用いた強度支配域のクレータースケール則に関する実験的研究
- 2016, 日本地球惑星科学連合大会予稿集(Web), 2016レゴリス層を模擬した粉粒体を伝播する衝突励起振動に関する実験的研究
- 2016, 日本惑星科学会秋季講演会予稿集(Web), 2016模擬氷天体地殻を用いた強度支配域のクレータースケール則に関する実験的研究
- 2016, 日本惑星科学会秋季講演会予稿集(Web), 2016エジェクタ速度分布スケール則の構築とはやぶさ2 インパクター衝突による地形変化領域の考察
- 2016, 宇宙科学技術連合講演会講演集(CD-ROM), 60thはやぶさ2のサイエンス目標と観測運用計画の検討
- Progress of impact experiments on ice1990年から,北海道大学低温科学研究所において,大型低温室に設置した衝突装置により氷の衝突実験が始まった.20年に渡り行われた実験は,氷の衝突クレーターや衝突破壊強度を研究するための基礎データを提供し,水谷スケール則やπスケール則などの衝突モデルの検証と改良に大きく貢献してきた.両方のスケール則が論拠としている終段階等価性にまで踏み込んだ研究を行うため,衝撃波の伝播過程を衝撃波の可視化及び衝撃圧力のその場観察により研究した.そしてこの実験は,スケール則に対する空隙率や力学強度等の影響を調べる方向へと展開した.今後は,最近導入された6km/sを超える衝突装置や最新の観測機器を生かした研究が期待される.The Japanese Society for Planetary Sciences, Sep. 2015, Planetary People, 24(3) (3), 167 - 180, Japanese
- 2015, 日本地球惑星科学連合大会予稿集(Web), 2015粘性流体へのクレーター形成実験:彗星核上のクレーターの形成及び緩和過程への応用
- 2015, 日本地球惑星科学連合大会予稿集(Web), 2015氷・岩石混合物のレオロジーに関する実験的研究:宇宙雪氷学的応用
- 2015, 日本地球惑星科学連合大会予稿集(Web), 2015多孔質石膏標的に対する斜め衝突破壊実験
- 2015, 日本惑星科学会秋季講演会予稿集(Web), 2015多孔質球の斜め衝突実験:衝突破壊強度に対する衝突角度の影響
- 2015, 日本惑星科学会秋季講演会予稿集(Web), 2015熱進化した氷天体の衝突破壊現象の解明
- 2015, 日本惑星科学会秋季講演会予稿集(Web), 2015フォボス・デイモスの熱環境の再評価
- 2015, 日本地球惑星科学連合大会予稿集(Web), 2015衝突クレーター形成に伴うイジェクタ速度分布に関する実験的研究
- 2015, 日本地球惑星科学連合大会予稿集(Web), 2015氷・石英砂混合標的に対する高速度クレーター形成実験
- 2015, 日本地球惑星科学連合大会予稿集(Web), 2015レゴリス層を模擬した粉粒体を伝播する衝突励起地震に関する実験的研究
- 2015, 日本惑星科学会秋季講演会予稿集(Web), 2015氷・砂レゴリス層へのクレーター形成実験
- 2015, 日本惑星科学会秋季講演会予稿集(Web), 2015密度の異なる弾丸を用いた高速度クレーター形成実験:衝突励起地震の弾丸物質依存性
- 丸善, Jan. 2015, パリティ, 30(1) (1), 56 - 58, Japanese地球・月・小惑星の天体衝突過程 (特集 物理科学,この1年) -- (地球惑星物理)
- 日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, "O12 - 02", JapaneseO12-02 高速度域におけるクレーターエジェクタ速度のスケール則に関する実験的研究(口頭発表セッション12 衝突実験II,口頭発表)
- 日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, "O11 - 04", JapaneseO11-04 氷地殻を模擬した氷・砂混合物に対する高速度クレーター形成実験(口頭発表セッション11 衝突実験I,口頭発表)
- 日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, "O11 - 05", JapaneseO11-05 粉粒体を伝播する衝突励起地震に関する実験的研究II(口頭発表セッション11 衝突実験I,口頭発表)
- 日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, "O8 - 03", JapaneseO8-03 かんらん岩および玄武岩高速衝突破片の3次元形状分布 : はやぶさ粒子との比較(口頭発表セッション8 物質II,口頭発表)
- 日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, S02, JapaneseS02 真空下における粉体熱伝導率の空隙率依存性測定実験と微惑星の初期熱進化への応用(特別セッション(最優秀発表賞選考),口頭発表)
- 日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, "O7 - 04", JapaneseO7-04 はやぶさ2分離カメラ(DCAM3-D)の開発状況とサイエンス(口頭発表セッショ7 はやぶさ2,口頭発表)
- Institute of Space and Astronautical Science, JAXA ; [2006]-, 05 Aug. 2014, Proceedings of the ISAS Lunar and Planetary Symposium, 46, 10p, JapaneseOptical observation of impact simulation by Hayabusa-2 Deployable Camera (DCAM3)
- A proposal for determining the lunar crustal thickness by one penetrator probe using impact seismic events47th ISAS Lunar and Planetary Symposium (August 4-6, 2014. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Aug. 2014, 第47回月・惑星シンポジウム = Proceedings of the 47th ISAS Lunar and Planetary Symposium, Japanese
- The Japanese Society for Planetary Sciences, Mar. 2014, Planetary People, 23(1) (1), 61 - 63, JapaneseSymposium for a small scale planetary exploration using the epsilon rocket
- 日本高圧力学会学会誌, Feb. 2014, 高圧力の科学と技術, 24(1) (1), 13 - 20, Japanese[Refereed][Invited]Introduction scientific journal
- 2014, 雪氷研究大会講演要旨集, 2014雪・氷の二層構造標的上へのクレーター形成実験
- 2014, 雪氷研究大会講演要旨集, 2014雪の衝突圧密に関する実験的研究
- 2014, スペース・プラズマ研究会・講演集(Web), 2013フラッシュX線を用いた衝突圧密に関する実験的研究
- 2014, スペース・プラズマ研究会・講演集(Web), 2013, 26 (WEB ONLY), Japanese「はやぶさ2」SCIの地上較正実験
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O8 - 04", JapaneseO8-04 事前衝突を経験した多結晶氷の衝突破壊条件に関する実験的研究 : 氷天体の蓄積ダメージの見積もり(口頭発表セッション8(衝突),口頭発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, S05, JapaneseS05 粉体物質の熱伝導率測定実験と月惑星表層の熱伝導率構造(特別セッション(最優秀発表賞選考),口頭発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O8 - 12", JapaneseO8-12 ガラスビーズ焼結体の熱伝導率測定と微惑星熱進化への応用(口頭発表セッション8(衝突),口頭発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O8 - 09", JapaneseO8-09 クレーターエジェクタの速度分布に関する実験的研究 : Wada's methodの応用(口頭発表セッション8(衝突),口頭発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O8 - 02", JapaneseO8-02 普通コンドライト母天体を形成した微惑星の低速度衝突実験 : 同サイズ試料の衝突破壊に対する斜め衝突の影響(口頭発表セッション8(衝突),口頭発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "P2 - 22", JapaneseP2-22 砂への低速度衝突による衝突励起地震の観測(ポスターセッション2,ポスター発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "P3 - 28", JapaneseP3-28 イジェクタカーテン観測からイジェクタの放出角度と速さを推定する方法(ポスターセッション3,ポスター発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "P3 - 09", JapaneseP3-09 はやぶさ2小型衝突装置の中空弾丸がクレーター形成過程に及ぼす影響(ポスターセッション3,ポスター発表)
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O9 - 13", JapaneseO9-13 はやぶさ2DCAM3-Dの光学性能検証試験(口頭発表セッション9(はやぶさ),口頭発表)
- The Japanese Society for Planetary Sciences, 20 Nov. 2013, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2013, "P3 - 07", JapaneseP3-07 Environmental compatibility design and verification tests of Hayabusa-2 DCAM3-D
- 日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋季講演会予稿集, 2013, "P3 - 08", Japaneseはやぶさ2搭載DCAM3‐D用CMOS光学センサの性能評価
- はやぶさ2には小型の衝突装置(SCI)が搭載されており,これは秒速2kmで小惑星表面に衝突してクレーターを形成する.このクレーターは小惑星内部を覗くための小窓であり,リモートセンシング観測やサンプル回収から,小惑星表面の宇宙風化や浅内部構造に関する知見を得る.一方, SCIが衝突する様子は分離カメラ(DCAM3)により撮影され,イジェクタカーテンの拡大する様子や小惑星周囲を飛び交うダストを観察する. SCIによる小惑星への衝突は宇宙衝突実験ともいえる.我々はこの世界で最初の小惑星における宇宙衝突実験の機会を利用して,微小重力下における「本物の小惑星物質」のクレーター形成過程を明らかにする.日本惑星科学会, Sep. 2013, 遊・星・人: 日本惑星科学会誌, 22(3) (3), 152 - 158, Japanese[Refereed][Invited]Introduction scientific journal
- 15 Apr. 2013, 未来を拓く高圧力科学技術セミナーシリーズ, (38) (38), 9 - 16, Japanese太陽系における高速度衝突現象と惑星の起源と進化
- Mar. 2013, The proceedings of 44th Lunar and Planetary Science Conference, abstract 1904, EnglishSmall Carry-On Impactor (SCI): Its Scientific Purpose, Operation, and Observation Plan in Hayabysa-2 MissionOthers
- 2013, 宇宙科学技術連合講演会講演集(CD-ROM), 57thイトカワ再探査による宇宙衝突実験
- 2013, 宇宙科学技術連合講演会講演集(CD-ROM), 57thはやぶさ2衝突装置とその運用について
- 2013, スペース・プラズマ研究会・講演集(Web), 2012石膏への弾丸貫入とクレーター形成のフラッシュX線による可視化実験
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 47 - 47, JapaneseO5-03 焼結雪への衝突におけるエジェクタ速度計測(口頭発表セッション5(衝突科学II,室内実験I),口頭発表)
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 44 - 44, JapaneseO4-08 同一画への事前衝突を受けた氷試料の衝突破壊強度(口頭発表セッション4(惑星大気,衝突科学I),口頭発表)
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 124 - 124, JapaneseP2-15 分化天体模擬物質への衝突実験(ポスターセッション2,ポスター発表)
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 127 - 127, JapaneseP2-18 火星氷河・凍土を模擬した高濃度岩石粒子を含む氷の静的圧縮強度 : 強度に対する岩石粒子の粒径の影響(ポスターセッション2,ポスター発表)
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 48 - 48, JapaneseO5-04 同サイズ微惑星の衝突破壊における破片速度分布(口頭発表セッション5(衝突科学II,室内実験I),口頭発表)
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 125 - 125, JapaneseP2-16 等質量氷ダスト球の衝突破壊実験 : 破片速度分布の空隙率依存性(ポスターセッション2,ポスター発表)
- 日本惑星科学会, 24 Oct. 2012, 日本惑星科学会秋期講演会予稿集, 2012, 114 - 114, JapaneseP2-04 はやぶさ2SCI(小型搭載型衝突装置)で目指す衝突の科学(ポスターセッション2,ポスター発表)
- The Japanese Society for Planetary Sciences, Sep. 2012, Planetary People, 21(3) (3), 247 - 252, Japanese[Refereed]Introduction scientific journal
- Jul. 2012, Proceedings of 39th COSPAR Scientific Assembly, B0.4-0016-12, EnglishNumerical simulation of trajectories of impact ejecta around a small asteroidOthers
- May 2012, Proceedings of Asteroids, Comets, Meteors 2012, abstract 6373, EnglishImpact experiments of metal core-rocky mantle targets: Implication for collisional disruption of iron meteorite parent bodiesOthers
- May 2012, The proceedings of Asteroids, Comets, Meteors 2012, abstract 6093, EnglishExperimental study on impact disruption of rocky rubble-pile bodiesOthers
- May 2012, The proceedings of Asteroids, Comets, Meteors 2012, abstract 6250, EnglishExperimental study on collisional sticking of isometric sintered porous ice spheresOthers
- May 2012, Proceedings of Asteroids, Comets, Meteors 2012, abstract 6476, EnglishDistribution of impact ejecta around a small asteroid: Implication to artificial impact experiment in Hayabusa-2 mission to the asteroid 1999JU3Others
- 2012, 日本惑星科学会誌 遊・星・人, 21(3) (3)「月惑星探査の来たる10年:第二段階のまとめ」イトカワ再探査による宇宙衝突実験
- 2012, 宇宙科学技術連合講演会講演集(CD-ROM), 56thはやぶさ2衝突装置について
- 2012, 衝撃波シンポジウム講演論文集, 2011フラッシュX線を用いた石膏への弾丸貫入とクレーター形成過程のその場観察
- 2012, スペース・プラズマ研究会・講演集(Web), 2011フラッシュX線による石膏への弾丸貫入とクレーター形成過程のその場観察
- 2012, スペース・プラズマ研究会・講演集(Web), 2011分化隕石母天体の衝突破壊と進化
- The Japanese Society for Planetary Sciences, 23 Oct. 2011, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2011, 87 - 87, JapaneseS34-04 A Formation Mechanism of Rampart-like Ejecta Formed by an Impact on the Layer of Fine Glass Beads
- The Japanese Society for Planetary Sciences, 23 Oct. 2011, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2011, 102 - 102, JapaneseSP2-04P Laboratory Experiments for Impact Cratering on Sedimentary Rocks
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 145 - 145, JapaneseS34-05P 隕石への超高速衝突実験と塵回収(一般ポスターセッション3,ポスター発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 106 - 106, JapaneseSP2-08P CPS衝突実験実習の取り組み(特別セッション2<実習会,アウトリーチ>,ポスター発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 90 - 90, JapaneseS34-07 複数回衝突が及ぼす氷ターゲットの衝突破壊強度への影響(口頭セッション34:太陽系における衝突科学,口頭発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 84 - 84, JapaneseS34-01 分化隕石母天体の衝突破壊と進化 : 衝突実験からのアプローチ(口頭セッション34:太陽系における衝突科学,口頭発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 41 - 41, JapaneseS22-01 月惑星探査に基づく太陽系年代学の構築(口頭セッション22:惑星探査,口頭発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 86 - 86, JapaneseS34-03 多孔質焼結シリカと石膏を用いた超高速度衝突実験(口頭セッション34:太陽系における衝突科学,口頭発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011, 148 - 148, JapaneseS34-08P 等質量氷ダスト球の衝突付着に関する実験的研究(一般ポスターセッション3,ポスター発表)
- 日本惑星科学会, 23 Oct. 2011, 日本惑星科学会秋期講演会予稿集, 2011(0) (0), 95 - 95, JapaneseS35-02 火星凍土を模擬した氷・固体粒子混合物のレオロジーに関する実験的研究(口頭セッション35:室内実験・物性科学,口頭発表)
- 2011, 衝撃波シンポジウム講演論文集, 2010秒速10km以上での衝突による発光:X線計測
- 2011, スペース・プラズマ研究会・講演集(Web), 2010ラブルパイル天体の衝突破壊実験
- 2011, スペース・プラズマ研究会・講演集(Web), 2010分化天体からの鉄隕石放出条件の解明
- 2011, 衝撃波シンポジウム講演論文集, 2010岩石への超高速衝突実験:塵粒子のサイズ分布解析とデブリ円盤への応用
- 「月惑星探査の来たる10年」検討では第一段階で5つのパネルの各分野に於ける第一級の科学について議論した.そのとりまとめを報告する.地球型惑星固体探査パネルでは,月惑星内部構造の解明,年代学・物質科学の展開による月惑星進化の解明,固体部分と結合した表層環境の変動性の解明,が挙げられた.地球型惑星大気・磁気圏探査パネルは複数学会に跨がる学際性を考慮して,提案内容に学会間で齟齬が生じないように現在も摺り合わせを進めている.本稿では主たる対象天体を火星にしぼって第一級の科学を論じる.小天体パネルでは始原的・より未分化な天体への段階的な探査と,発見段階から理解段階へ進むための同一小天体の再探査が提案された.木星型惑星・氷衛星・系外惑星パネルは広範な科学テーマの中から,木星の大気と磁気圏探査,氷衛星でのハビタブル環境の探査,系外惑星でも生命存在可能環境と生命兆候の発見について具体的な議論を行った.アストロバイオロジーパネルでは現実的な近未来の目標として火星生命探査を,長期的な目標として氷衛星・小天体生命探査を目指した観測装置開発が検討された.これらのまとめを元に「月惑星探査の来たる10年」検討は2011年7月より第二段階に移行し,ミッション提案・観測機器提案の応募を受け付けた.The Japanese Society for Planetary Sciences, 2011, Planetary People - The Japanese Society for Planetary Sciences, 20(4) (4), 349 - 365, Japanese
- 11 Oct. 2010, 高圧討論会講演集, 51, 275 - 275, JapaneseFlyer acceleration using a high-power laser : Impact experiments at 10-60km/s
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 57 - 57, Japanese306 分化天体の衝突破壊および鉄隕石放出条件の解明(オーラルセッション7 衝突・破壊過程)
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 102 - 102, JapaneseP022 ラブルパイル構造を持つ天体の衝突破壊の特徴(ポスターセッション2)
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 103 - 103, JapaneseP023 圧子圧入試験による氷・岩石混合物の局所的変形強度の計測(ポスターセッション2)
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 13 - 13, Japanese113,P005 氷微惑星の衝突破壊様式と破片速度分布に対する空隙率の効果(オーラルセッション2 最優秀発表賞選考)(ポスターセッション1 最優秀発表賞)
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 87 - 87, JapaneseP007 10km/sを超える衝突速度でのクレーター形成実験(ポスターセッション2)
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 93 - 93, JapaneseP013 高出力レーザーによる飛翔体の加速と衝突実験 : 可視高速カメラおよびX線カメラによる衝突光の撮影(ポスターセッション2)
- 日本惑星科学会, 06 Oct. 2010, 日本惑星科学会秋期講演会予稿集, 2010, 14 - 14, Japanese114,P006 岩石への小金属球超高速衝突実験 : 塵粒子のサイズ分布解析(オーラルセッション2 最優秀発表賞選考)(ポスターセッション1 最優秀発表賞)
- The Japanese Society for Planetary Sciences, 25 Jun. 2010, Planetary people, 19(2) (2), 164 - 174, JapaneseReport of the 2nd CPS Experimental Laboratory CourseMeeting report
- Jun. 2010, 遊星人(日本惑星科学会学会誌), 19(2) (2), 136 - 147, Japanese氷・シリカ混合物の流動則に対する空隙の効果:氷衛星の地形緩和への応用[Refereed]Others
- Jun. 2010, 遊・星・人 : 日本惑星科学会誌, 19(2) (2), 136 - 147, Japanese氷・シリカ混合物の流動則に対する空隙の効果:氷衛星の地形緩和への応用[Refereed]Others
- 2010, スペース・プラズマ研究会, 2009(CD-ROM)分化天体からの鉄隕石放出条件の解明 金属の低温脆性が及ぼす影響
- 2010, スペース・プラズマ研究会, 2009(CD-ROM)層構造地殻に形成される衝突クレーターに関する実験的研究
- 日本惑星科学会, 28 Sep. 2009, 日本惑星科学会秋期講演会予稿集, 2009, 77 - 77, Japanese326 分化天体からの鉄隕石放出条件の解明 : 金属の低温脆性が及ぼす影響(オーラルセッション12 衝突実験)
- 日本惑星科学会, 28 Sep. 2009, 日本惑星科学会秋期講演会予稿集, 2009, 110 - 110, JapaneseP310 層構造に形成される衝突クレーターに関する実験的研究(ポスターセッション3)
- 日本惑星科学会, 28 Sep. 2009, 日本惑星科学会秋期講演会予稿集, 2009, 76 - 76, Japanese325 超高空隙率雪球の衝突破壊と破片速度分布に関する実験的研究(オーラルセッション12 衝突実験)
- 日本惑星科学会, 28 Sep. 2009, 日本惑星科学会秋期講演会予稿集, 2009, 75 - 75, Japanese324 超低密度物質中への貫入過程における突入物質減速メカニズムの速度依存性(オーラルセッション12 衝突実験)
- 日本惑星科学会, 28 Sep. 2009, 日本惑星科学会秋期講演会予稿集, 2009, 11 - 11, Japanese111,P004 氷・シリカ混合物の流動則に対する空隙の効果 : 氷衛星の地形緩和への応用(オーラルセッション2 最優秀発表賞選考,最優秀発表賞選考エントリーポスター,ポスターセッション1)
- 日本惑星科学会, 28 Sep. 2009, 日本惑星科学会秋期講演会予稿集, 2009, 72 - 72, Japanese321 超高速度衝突による衝突破片サイズ分布(オーラルセッション12 衝突実験)
- Sep. 2009, 雪氷(日本雪氷学会学会誌), 71(5) (5), 377 - 385, Japanese氷・シリカ微粒子混合物の力学強度に関する実験的研究[Refereed]Others
- The Japanese Society for Planetary Sciences, Jun. 2009, Planetary People, 18(2) (2), 111 - 118, Japanese第1回CPS衝突実験実習報告Meeting report
- May 2009, 天文月報(日本天文学会学会誌), 102(2) (2), 127 - 133, Japanese氷微惑星の衝突破壊[Refereed]Others
- 31 Mar. 2009, 大阪大学レーザーエネルギー学研究センター共同利用・共同研究成果報告書, 2008, 11 - 12, Japanese超地球脱出速度における衝突クレーター形成実験
- Projectile acceleration and impact experiments using a high-power laser : Impacts with a velocity higher than 10km/s大阪大学レーザーエネルギー学研究センターの高出力レーザーを使ってマクロサイズ(0.1mm以上)の弾丸飛翔体を加速する実験を行っている.これまでに直径0.1〜0.3mmの弾丸飛翔体が秒速10〜60kmに加速されている.この高速度に加速された弾丸飛翔体を使って金属どうしの衝突実験を行い,クレーター,放出破片による二次クレーター,衝突により発生したガスからの輝線,などを観測した.惑星科学への応用を念頭に置いた,珪酸塩物質の衝突発光観測,岩石ターゲットを使ったクレーター形成実験,エアロジェルによる岩石放出破片の捕獲,などの実験も並行して進行中である.日本惑星科学会, 25 Mar. 2009, Planetary People, 18(1) (1), 4 - 9, Japanese
- 日本惑星科学会, 01 Nov. 2008, 日本惑星科学会秋期講演会予稿集, 2008, 75 - 75, Japanese314 リム付きコンドリュールの衝突付着と跳ね返りに関する実験的研究(コンドリュール,オーラルセッション9)
- 日本惑星科学会, 01 Nov. 2008, 日本惑星科学会秋期講演会予稿集, 2008, 45 - 45, Japanese211 石膏球の衝突破壊に関する実験的研究 : ラブルパイル天体形成との関連(衝突現象および関連室内実験,オーラルセッション6)
- 日本惑星科学会, 01 Nov. 2008, 日本惑星科学会秋期講演会予稿集, 2008, 70 - 70, Japanese309 氷・シリカ微粒子混合物の圧密実験と氷小天体の密度進化への応用(微惑星と原始惑星,オーラルセッション8)
- 日本惑星科学会, 01 Nov. 2008, 日本惑星科学会秋期講演会予稿集, 2008, 118 - 118, JapaneseP128 レーザー加速弾丸を用いた高速度衝突クレーター形成実験(ポスター:一般,ポスターセッション1)
- The Japanese Society for Planetary Sciences, 01 Nov. 2008, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2008, 44 - 44, Japanese210 Experimental Observation of Ejecta from Hyper Velocity Impact of Laser Accelerated Projectile into Rocks
- The Japanese Society for Planetary Sciences, 25 Mar. 2008, Planetary People, 17(1) (1), 85 - 86, JapaneseActivities of Impact Research Group
- 日本雪氷学会, 15 Jan. 2007, 雪氷, 69(1) (1), 95 - 100, Japanese氷の物理化学に関する国際会議(PCI 2006)参加報告 : International Symposium on Physics and Chemistry of Ice : PCI
- 2007, 日本惑星科学会秋季講演会予稿集, 2007高濃度粒子混合氷の粘性率とその氷天体流動地形への応用
- 2007, 日本惑星科学会秋季講演会予稿集, 2007氷クレーターの形成に伴う衝突残留熱に関する実験的研究
- Impact disruption and crater formation on icy bodies氷衛星上の衝突クレーターや外惑星領域における惑星・衛星の衝突集積過程に関連して,氷を用いた高速度衝突実験が行われている.氷の衝突実験は融けやすい氷の取り扱いに問題が生じ精度の高い実験をすることが難しかったが,衝突実験装置自体を大型の低温室に設置することによりその問題が解決され,研究が飛躍的に進歩した.特に氷中を伝播する衝撃波や破壊素過程の理解が進み,さらに弾丸にも氷を用いた高速度衝突実験が衝突速度700m/sまで可能となった.その結果,氷クレーターの形態変化やスケール則及び氷の衝突破壊強度が明らかになった.Impact experiments on water ice have been conducted to study impact crater formation on icy satellites and collisional accretion process of icy bodies. It was difficult to use water ice for collisional experiments in a laboratory because it was easy to melt at room temperature. In order to overcome this difficulty, an impact facility was set in a large cold room below 0℃, and this method is successful to advance the impact study on water ice. Elementary physical processes related to impact disruption were especially studied to achieve a good progress. Furthermore, it was enabled that an ice projectile was accelerated at the impact velocity higher than 700m/s. As a result, the impact strength of water ice was obtained to be one order of magnitude smaller than that of basalt, and a systematic change of crater morphologies with the impact velocity and the scaling law on the impact craterwas extensively studied.北海道大学低温科学研究所, 2007, Low temperature science, 66, 113 - 121, Japanese
- 2007, ADVANCES IN SPACE RESEARCH, 40(2) (2), 252 - 257, English
- Using a high-power laser, Gekko XII, at Institute of Laser Engineering, Osaka University, we carried out a acceleration experiment of projectiles. We observed the acceleration of glass spheres with a diameter of 100 micro-meters. The glass spheres were accelerated to ~ 13 km/s. Also, we observe a CaO line in the spectrum of self-luminous impact vapor.THE JAPANESE SOCIETY FOR PLANETARY SCIENCES, 2007, Abstracts for fall meeting of the Japanese Society for Planetary Science, 2007(0) (0), 52 - 52
- 2006, 日本惑星科学会秋季講演会予稿集, 2006氷・シリカ粒子混合物の変形実験:流動則に対するシリカ粒子の効果と氷天体テクトニクスヘの応用
- 雪氷のフィールドを地球から太陽系の惑星・衛星にまで広げた時に現れる雪氷学の新たな研究課題を総称して宇宙雪氷学と呼ぶ.この課題の一つに土星の衛星系が持つサイズと平均密度の正の相関関係がある.この関係は,衛星の衝突集積時に起こる衝突分別過程で説明できる.この分別過程は,氷衛星の岩石含有率の差に起因する衝突破壊強度の違いにより引き起されると考えられる.The Japanese Society of Snow and Ice, 2005, 雪氷(日本雪氷学会学会誌), 67(2) (2), 147 - 154, Japanese[Refereed]Introduction scientific journal
- 2004, 遊星人(日本惑星科学会学会誌), 13(3) (3), 166 - 174, Japanese火星環境の模擬室内実験[Refereed]Introduction scientific journal
- 15 Nov. 2003, 雪氷 : 日本雪氷協會雜誌, 65(6) (6), i - ii, JapaneseCrater formation on ice by high-velocity impact
- 306 Impact strength of ice-rock mixture at various porositiesImpact strength of porous ice-rock mixture was studied by laboratory experiments in a cold room. The porosity of the target was changed from 0 % to 55 %. Ice cylindrical projectile was impacted at the velocity from 150 m/s to 650 m/s. By means of the measurements of the largest fragment mass, the impact strength was determined for the target at different porosities and rock contents. The strength increases with decreasing the porosity for the snow target, however it increases with decreasing the porosity for the target of ice-rock mixture.The Japanese Society for Planetary Sciences, 06 Oct. 2001, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2001, 45 - 45, Japanese
- 15 Jan. 2001, 雪氷, 63(1) (1), 94 - 95, Japanese平田賞を受賞して
- The Japanese Society for Planetary Sciences, 31 Oct. 2000, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2000, 41 - 41, JapaneseP107 Impact cratering of granular mixture targets made of H_2O Ice-CO_2 Ice-pyrophylite
- The Japanese Society for Planetary Sciences, 13 Nov. 1999, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1999, 56 - 56, JapaneseP426 Effects of organic materials on the coagulation of solid particles
- The Japanese Society for Planetary Sciences, 25 Mar. 1999, Planetary people, 8(1) (1), 43 - 50, JapaneseRebound Experiments of Icy Spheres (
Icy Satellites) - The Japanese Society for Planetary Sciences, 13 Oct. 1998, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1998, 103 - 103, Japanese319 Shock compression of snow
- May 1998, 地球惑星科学関連学会合同大会予稿集, 1998, 258 - 259, JapaneseObservation of shock wave and fracture in ice.
- Mar. 1997, 地球惑星科学関連学会合同大会予稿集, 1997, 592, JapaneseHugoniot of ice and shock attenuation at -18.DEG.C..
- Mar. 1997, 地球惑星科学関連学会合同大会予稿集, 1997, 568, JapaneseObservation of shock wave and fracture in ice.
- The Japanese Society for Planetary Sciences, 02 Oct. 1996, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1996, 49 - 49, JapaneseP13 Velocity Measurements of Ice Fragments made by Oblique Impacts
- The Japanese Society for Planetary Sciences, 02 Oct. 1996, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1996, 38 - 38, Japanese202 New methods of making an amorphous icy grains for cometary nucleus simulation experiments
- The Japanese Society for Planetary Sciences, 02 Oct. 1996, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1996, 39 - 39, Japanese203 Measurement of Impact Vaporization of Water Ice : Impact Velocity and Temperature Dependence
- The Japanese Society for Planetary Sciences, 25 Mar. 1996, Planetary People, 5(1) (1), 17 - 22, JapaneseJozankei Symposium JSPS
- Mar. 1996, 地球惑星科学関連学会合同大会予稿集, 1996, 560, JapaneseHugoniot of ice and shock propagation at -18.DEG.C..
- The Japanese Society for Planetary Sciences, 01 Dec. 1995, Planetary People, 4(4) (4), 253 - 255, Japanese1995 JSPS Fall Meeting
- The Japanese Society for Planetary Sciences, 13 Nov. 1995, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1995, P05, JapaneseP05 Experimental studies on impact vaporization of ice
- The Japanese Society for Planetary Sciences, 13 Nov. 1995, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1995, 508 - 508, Japanese508 Measurements of Ejection Velocities in Collisional Disruption of Ice Spheres
- The Japanese Society for Planetary Sciences, 13 Nov. 1995, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1995, 507 - 507, Japanese507 In Situ Observations of the Cratering by Oblique Impacts on Ice
- The Japanese Society for Planetary Sciences, 13 Nov. 1995, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1995, 501 - 501, Japanese501 Experiments on size dependence of restitution coefficients for ice spheres
- The Japanese Society for Planetary Sciences, 25 Mar. 1995, Planetary People, 4(1) (1), 26 - 32, JapaneseImpact Process of Ice (
"Impact Experiments") - The Japanese Society for Planetary Sciences, 25 Mar. 1995, Planetary People, 4(1) (1), 3 - 4, JapaneseAbout the Special Issue (
"Impact Experiments") - The Japanese Society for Planetary Sciences, 03 Oct. 1994, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1994, 114 - 114, Japanese114 Crack growth process in ice colliosions
- The Japanese Society for Planetary Sciences, 03 Oct. 1994, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1994, 115 - 115, Japanese115 Measurements of particle velocity in the shock compression of snow
- The Japanese Society for Planetary Sciences, 15 Sep. 1994, Planetary People, 3(3) (3), 206 - 208, JapaneseNew Campus (10) : Hokkaido University
- 日本惑星科学会, 15 Oct. 1993, 日本惑星科学会秋期講演会予稿集, 1993, 102 - 102, Japanese102 衝突における小破片の生成 : 氷と葉ろう石の衝突実験(セッションI)
- The Japanese Society for Planetary Sciences, 15 Oct. 1993, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1993, 256 - 256, Japanese256 Impact experiments of ice spheres rebounding on an ice block at low temperatres
- The Japanese Society for Planetary Sciences, 15 Oct. 1993, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1993, 267 - 267, Japanese267 Deformation experiment of ice-ammonia mixture at low temperatures
- The Japanese Society for Planetary Sciences, 25 Jun. 1993, Planetary People, 2(2) (2), 67 - 72, JapanesePanel Discussion Reports
- 56th Lunar and Planetary Science Conference, Mar. 2025, EnglishCollisional Disruption of Core-Mantle Bodies Simulating Differentiated Planetesimals with Molted or Solid CoresOral presentation
- 56th Lunar and Planetary Science Conference, Mar. 2025, EnglishPost-Shock Heating Below Impact Crater Formed on Wet Sand TargetsPoster presentation
- 56th Lunar and Planetary Science Conference, Mar. 2025, EnglishSubsurface Strength of Solid Bodies Estimated from Crater Morphology: Cratering Experiment on Regolith-Covered BedrockPoster presentation
- 56th Lunar and Planetary Science Conference, Mar. 2025, EnglishEffects of Atmospheric Pressure on Wake and Crater Formation in High-Velocity Oblique Impacts: Comparison with Craters on VenusPoster presentation
- 56th Lunar and Planetary Science Conference, Mar. 2025, EnglishLow-Velocity Impact Simulations on a Granular Material Based on an Effective Elastic Model Composed of a Random Packing of SpheresPoster presentation
- 56th Lunar and Planetary Science Conference, Mar. 2025, EnglishExperimental Study on Impact Crater Formed on Icy Crust Covering Subsurface OceanPoster presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese湿った砂におけるクレーター形成に伴う周辺大気の温度変化Oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese氷球の低速度斜め衝突実験:反発係数に対する衝突角度依存性Oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese内海を覆う氷地殻上のクレーター形成実験Oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 I, Nov. 2024, Japanese鉄・岩石ラブルパイル天体模擬資料への衝突破壊実験及び三次元軌道解析Oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese衝突研究会が生まれたときInvited oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese基盤岩を覆うレゴリス層のクレーター形成実験: 基盤岩がクレーター成長・崩壊に及ぼす影響Oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese小惑星起伏地形に起因するクレーター形状の多様性 に関する実験的研究Oral presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024クレーター形成に対する埋没ボルダーの影響:アーマリング効果に対するボルダーの埋没深度依存性と強度依存性
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese分化溶融天体の衝突における実験的研究:層構造液体標的のクレーター形成過程Poster presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japaneseエジェクタ速度スケール則に対する粒⼦サイズ依存性と 微⼩⼩惑星形成への関連Poster presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese⼤気中で形成されるクレーター周囲の起伏構造に関する 実験的研究Poster presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese氷天体上の高速斜め衝突により発生する ホットスプリングPoster presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese2 層構造標的への衝突実験Poster presentation
- 天体の衝突物理の解明 (XX)~日本の衝突研究の未来 II~, Nov. 2024, Japanese原始惑星衝突に伴う衝突体の残存率と その産状についての実験的研究Poster presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese氷天体上の高速斜め衝突により発生する ホットスプリングOral presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese小惑星起伏地形に起因するクレーター形状の 多様性に関する実験的研究Oral presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese液体の水を含む表面でのクレーター形成に伴う温 度上昇:湿った砂標的に対する高速度衝突実験Oral presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese氷微惑星の層構造が及ぼす衝突破⽚の質量速度分布への影響Poster presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese内海を覆う氷地殻上のクレーター形成実験Poster presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japaneseはやぶさ2分離カメラ画像を⽤いた SCI 衝突イジェクタの⾮対称分布復元Poster presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese鉄・岩石ラブルパイル天体模擬試料へ衝突破壊実験及び三次元軌道解析Poster presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japanese基盤岩を覆うレゴリス層のクレーター成長過程:基盤岩が掘削流に及ぼす影響Poster presentation
- 日本惑星科学会2024年秋季講演会, Sep. 2024, Japaneseボルダーへの衝突におけるアーマリング効果に対するボルダーの深さ依存性と ボルダーの強度がクレーター形成に及ぼす影響Poster presentation
- 17th Hypervelocity Impact Symposium, Sep. 2024, EnglishEffects of Surface Topography on The Crater Formation Process of Rubble-Pile AsteroidsOral presentation
- 17th Hypervelocity Impact Symposium, Sep. 2024, EnglishEjection Angles during Hypervelocity Impacts on Flat and Spherical Targets Investigated with Hydrocode SimulationsOral presentation
- JpGU2024, May 2024, Japanese氷天体上の高速斜め衝突により発生するクレーター内のホットスプリングOral presentation
- JpGU2024, May 2024, Japanese氷球の低速度斜め衝突に関する実験的研究:二次元レーザー変位計を用いた球の回転と位置変化の観察Poster presentation
- JpGU2024, May 2024, Japanese内海を覆う氷地殻上のクレーター形成実験Poster presentation
- JpGU2024, May 2024, Japanese大気中で形成されるクレーター周囲の起伏構造に関する実験的研究Poster presentation
- JpGU2024, May 2024, Japanese鉄・岩石ラブルパイル天体の再集積過程に関する実験的研究Poster presentation
- JpGU2024, May 2024, EnglishEjection velocities and angles during kinetic impact events on flat and spherical targets investigated with hydrocode simulationOral presentation
- JpGU2024, May 2024, Japanese2層粒子層標的におけるクレーター形成と衝突励起振動Poster presentation
- JpGU2024, May 2024, Japanese石英砂に埋没したボルダーに対するクレーター形成実験:アーマリング効果に対するボルダーの深さ依存性Poster presentation
- JpGU2024, May 2024, Japanese基盤岩を覆うレゴリス層のクレーター成長が抑制されるメカニズム:衝突励起振動の影響Poster presentation
- JpGU2024, May 2024, Japanese湿った砂表面における高速度斜め衝突:クレーター形成に伴う温度上昇およびクレーター形態に対する表面含水量の効果Oral presentation
- 55th Lunar and Planetary Science Conference 2024, Mar. 2024, EnglishIntrinsic spectral variation among C-type bright boulders on Ryugu revealed from observations of the artificial craterOral presentation
- 55th Lunar and Planetary Science Conference 2024, Mar. 2024, EnglishRe-accretion process after the catastrophic disruption event on a differentiated asteroidPoster presentation
- 55th Lunar and Planetary Science Conference 2024, Mar. 2024, EnglishHigh-velocity oblique impact may form a hot spring on a crater floor of icy bodiesOral presentation
- 令和5年度宇宙科学に関する室内実験シンポジウム, Feb. 2024, Japanese高速斜め衝突による多孔質氷上のクレーター底部の温度計測Oral presentation
- 令和5年度宇宙科学に関する室内実験シンポジウム, Feb. 2024, Japaneseレゴリス層に覆われた基盤岩標的へのクレーター形成実験:クレーター形態と衝突励起振動への基盤岩の影響Oral presentation
- 令和5年度宇宙科学に関する室内実験シンポジウム, Feb. 2024, Japaneseラブルパイル天体表層の衝突過程に対するボルダー強度とサイズ分布の影響Oral presentation
- American Geophysical Union (AGU) Fall Meeting 2023, Dec. 2023, EnglishImpact Experiments on Cohesive Layer Covered with Regolith Layer: Effects of Granular Layer Thickness and Bedrock Strength on Crater MorphologyPoster presentation
- American Geophysical Union (AGU) Fall Meeting 2023, Dec. 2023, EnglishImpact Cratering Experiments on Wet Sand: Crater Formation Mechanism of Secondary Craters on MarsPoster presentation
- American Geophysical Union (AGU) Fall Meeting 2023, Dec. 2023, EnglishImpact experiments on ice spherical targets simulating icy planetesimals at various thermal evolution stagesPoster presentation
- 天体の衝突物理の解明 (XIX) ~惑星科学・天文学における衝突現象の解析法, Nov. 2023, Japanese衝突クレーター形成に伴う地下に埋まったボルダーの放出に関する実験的研究Oral presentation
- 天体の衝突物理の解明 (XIX) ~惑星科学・天文学における衝突現象の解析法, Oct. 2023, Japanese熱進化を経験した氷微惑星の衝突破壊実験Poster presentation
- 天体の衝突物理の解明 (XIX) ~惑星科学・天文学における衝突現象の解析法, Oct. 2023, Japanese砂に埋没したボルダーへの衝突による破壊とクレーター形成に対するアーマリング効果Poster presentation
- 天体の衝突物理の解明 (XIX) ~惑星科学・天文学における衝突現象の解析法, Oct. 2023, Japanese鉄ラブルパイル天体の衝突破壊実験Poster presentation
- 天体の衝突物理の解明 (XIX) ~惑星科学・天文学における衝突現象の解析法, Oct. 2023, Japanese斜め衝突による角運動量輸送効率に関する実験的研究Poster presentation
- 天体の衝突物理の解明 (XIX) ~惑星科学・天文学における衝突現象の解析法, Oct. 2023, Japaneseレゴリスに覆われた基盤岩標的への衝突実験:クレーター形態と衝突励起振動の層厚依存性Oral presentation
- 日本惑星科学会2023年秋季講演会, Oct. 2023, Japanese衝突クレーター形成に伴う地下から放出されるボルダーの速度スケール則Poster presentation
- 日本惑星科学会2023年秋季講演会, Oct. 2023, Japaneseレゴリスに覆われた基盤岩標的へのクレーター形成実験:クレーター形態と衝突励起振動の計測Poster presentation
- 日本惑星科学会2023年秋季講演会, Oct. 2023, Japaneseクレーター形成に伴う周辺大気の温度変化Poster presentation
- 15th International Conference on the Physics and Chemistry of Ice, Sep. 2023, EnglishEffects of Impact Heating on Porous Icy Bodies Like CometsOral presentation
- 15th International Conference on the Physics and Chemistry of Ice, Sep. 2023, EnglishImpact strength of porous icy bodies in high-velocity oblique collision: Implication for catastrophic disruption of Kuiper belt objects in outer solar systemPoster presentation
- 15th International Conference on the Physics and Chemistry of Ice, Sep. 2023, EnglishExperimental study on collisional disruption of differentiated icy planetesimalsPoster presentation
- JpGU2023, May 2023, Japanese湿った砂のクレーター形成過程に対する含水率の効果とハビタブル天体への応用Oral presentation
- JpGU2023, May 2023, EnglishEjecta plume evolution observed in the Hayabusa2 impact experiment on RyuguOral presentation
- JpGU2023, May 2023, English小惑星の起伏表面に適用可能なクレータースケール則とクレーターの崩壊に関する実験的研究Poster presentation
- JpGU2023, May 2023, English厚みの異なるレゴリスで覆われた基盤岩への高速衝突実験:クレーター形態と衝突励起振動との関連Poster presentation
- JpGU2023, May 2023, EnglishImpact experiments for crater size scaling laws on asteroids covered with low-strength coarse-grained regolithOral presentation
- JpGU2023, May 2023, Japanese天体衝突における分化小天体の岩石マントル消失Oral presentation
- JpGU2023, May 2023, Japanese彗星核上のクレーター形成による衝突残留熱に対する衝突角度の影響Oral presentation
- JpGU2023, May 2023, Japanese分化した氷微惑星の衝突破壊過程に関する実験的研究Poster presentation
- JpGU2023, May 2023, Englishボルダーの破壊によるクレーター形成へのアーマリング効果Poster presentation
- JpGU2023, May 2023, Japanese土星リング粒子を模擬した多孔質氷球の低速度衝突実験:反発係数に対する空隙率依存性及び非弾性衝突メカニズムPoster presentation
- JpGU2023, May 2023, Japaneseコア・マントル構造を持つ含⽔微惑星の衝突破壊:標的内部の粒⼦速度分布と重力支配域における衝突破壊強度の決定Poster presentation
- JpGU2023, May 2023, Japanese圧密進化した氷衛星のクレーター形成過程に関する実験的研究:クレーターサイズスケール則と運動量輸送効率に対する空隙率の影響Poster presentation
- Protostars and Planets VII, Apr. 2023, EnglishExploration-Based Reconstruction of Planetesimals, Protostars and Planets VII, Kyoto International Conference Center[Invited]Invited oral presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023Impact experiments for crater size scaling laws on rubble-pike asteroidsOral presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023Collisional stripping of;he rock mantle on;he;differentiated asteroidPoster presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023Low-velocity impact experiments of porous ice ball simulating Saturn’s ring particle: Porosity dependence of restitution coefficients and the mechanism of inelastic collisionPoster presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023Experimental studies on crater scaling law applicable to undulating surfaces and crater collapsePoster presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023Post shock heat induced by high-velocity oblique impacts on porous icy bodiesPoster presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023High-velocity oblique impact experiments on wet sand targets simulating habitable planetsPoster presentation
- 54th Lunar and Planetary Science Conference (2023), Mar. 2023Photometric parameters of the ejecta deposits around an artificial crater on asteroid RyuguOral presentation
- 令和4年度宇宙科学に関する室内シンポジウム, Mar. 2023小惑星模擬物質の高速度衝突実験:衝突残留温度分布の物質強度依存性Oral presentation
- 天体の衝突物理の解明 (XVIII) ~表層粒子から探る太陽系天体の進化~, Nov. 2022多孔質氷球の反発係数:粘弾性変形及び塑性変形を考慮した非弾性衝突メカニズムOral presentation
- 天体の衝突物理の解明 (XVIII) ~表層粒子から探る太陽系天体の進化~, Nov. 2022コア・マントル構造を持つ含水小天体の衝突破壊と破片速度分布:標的内部の粒子速度分布の計測Oral presentation
- 天体の衝突物理の解明 (XVIII) ~表層粒子から探る太陽系天体の進化~, Nov. 2022レゴリスに覆われた基盤岩へのクレーター形成実験:衝突励起振動による物質移動との関連Oral presentation
- 天体の衝突物理の解明 (XVIII) ~表層粒子から探る太陽系天体の進化~, Nov. 2022ハビタブル天体表面を模擬した含水砂標的への斜め衝突実験Oral presentation
- 天体の衝突物理の解明 (XVIII) ~表層粒子から探る太陽系天体の進化~, Nov. 2022低強度粗粒標的に対する衝突実験:アーマリング効果を含んだクレータースケール則の構築Oral presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022起伏表面に適用可能なクレータースケール則と クレーターの崩壊に関する実験的研究Poster presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022氷・雪クレーター形成実験:クレーターサイズ・スケール則と運動量輸送に対する空隙の影響Poster presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022レゴリスに覆われた基盤岩へのクレーター形成実験:衝突励起振動による物質移動との関連Poster presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022衝突クレーター形成に伴う地下からのボルダー放出に関する実験的研究Poster presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022多孔質氷球の反発係数:塑性変形を考慮した非弾性衝突モデルの応用Oral presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022コア・マントル構造を持つ含水小天体の衝突破壊と破片速度分布:標的内部の粒子速度分布の計測Oral presentation
- 日本惑星科学会2022年秋季講演会, Sep. 2022ハビタブル天体表面を模擬した含水砂標的への斜め衝突実験Oral presentation
- 日本地球惑星科学連合2022年大会, Jun. 2022ラブルパイル天体表層模擬標的への衝突実験:クレーターサイズと衝突励起振動に対する低強度粗粒レゴリスの影響Poster presentation
- 日本地球惑星科学連合2022年大会, Jun. 2022クレーターの崩壊と非対称エジェクタカーテンが天体表層に及ぼす影響Poster presentation
- 日本地球惑星科学連合2022年大会, Jun. 2022ハビタブル天体への衝突に関する実験的研究:大気圧下での含水石英砂標的を用いた高速度衝突実験Poster presentation
- 日本地球惑星科学連合2022年大会, May 2022土星リング粒子を模擬した多孔質氷球の低速度での複数回衝突実験:反発係数と付着特性に対する空隙率の影響Oral presentation
- 日本地球惑星科学連合2022年大会, May 2022多孔質氷上の高速度衝突クレーターおよび温かいエジェクタの熱赤外観測Oral presentation
- Apophis T-7 Years: Knowledge Opportunities for the Science of Planetary Defense, May 2022Lessons Learned from Hayabusa II at Ryugu: Implications for the Regolith and Cohesion Properties for the Surface of Apophis[Invited]Invited oral presentation
- 53rd Lunar and Planetary Science Conference (2022), Mar. 2022, EnglishConstraining Asteroid Ryugu’s Surface Properties from Numerical Simulations of the SCI ImpactOral presentation
- 53rd Lunar and Planetary Science Conference (2022), Mar. 2022, EnglishApparent Brightness Change of Hyabusa2’s Artificial Crater Ejecta Observed by the ONC-T at Different Phase Angles and Implications for the Physical State of Natural Crater EjectaPoster presentation
- 53rd Lunar and Planetary Science Conference (2022), Mar. 2022, EnglishImpact Strength of Porous- and Ductile-Rocky Planetesimals in Gravity Dominated RegimePoster presentation
- 53rd Lunar and Planetary Science Conference (2022), Mar. 2022, EnglishPost Shock Heat Induced by High Velocity Impact on Porous Icy BodiesPoster presentation
- 53rd Lunar and Planetary Science Conference (2022), Mar. 2022, EnglishHigh-Velocity Impact Experiments of Simulated Porous Asteroids and Measurements of Post Impact Temperature around Impact CraterPoster presentation
- 53rd Lunar and Planetary Science Conference (2022), Mar. 2022, EnglishFirst NIR Hyperspectral Imaging of Hyabusa2 Returned Samples by the MicrOmega Microscope within the ISAS Curation FacilityOral presentation
- 令和3年度宇宙科学に関する室内実験シンポジウム, Mar. 2022, Japanese熱進化する微惑星の衝突破壊とそのフラッシュX線観測Oral presentation
- 令和3年度宇宙科学に関する室内実験シンポジウム, Mar. 2022, Japaneseラブルパイル小惑星模擬層のクレーター形成実験Oral presentation
- 天体の衝突物理の解明 (XVII) ~小天体進化における圧密過程の役割~, Nov. 2021熱進化した氷微惑星を模擬した圧密標的上のクレーター形成実験Poster presentation
- 天体の衝突物理の解明 (XVII) ~小天体進化における圧密過程の役割~, Nov. 2021, Japanese土星リング粒子を模擬した多孔質氷球の低速度衝突実験:反発係数及び付着特性に対する空隙率の影響及び非弾性衝突のメカニズムOral presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japanese小惑星上の低強度粗粒レゴリス層を伝播する衝突励起地震波Poster presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japanese氷微惑星上の高速衝突により発生する衝突残留熱の定量的評価Poster presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japaneseレゴリス起伏地形の緩和に対するクレーターと非対称エジェクタカーテンの影響Poster presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, JapaneseフラッシュX線による衝突破片の速度―質量分布の計測: 粘土を用いた延性標的の衝突破壊実験Poster presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japanese多孔質氷球の超低速度衝突における非弾性衝突メカニズムと付着境界速度Oral presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japaneseラブルパイル天体上の衝突クレーターからのボルダー放出過程Invited oral presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japanese層構造含水微惑星の模擬物質への衝突実験:デジタル画像相関法による標的内部の粒子速度分布の計測Poster presentation
- 日本惑星科学会2021年秋季講演会, Sep. 2021, Japanese熱進化した氷微惑星の斜め衝突に関する実験的研究Poster presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, English小惑星のレゴリス起伏地形に形成されるクレーターに関する実験的研究Oral presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, Japanese小惑星衝突時の運動量輸送に関する実験的研究Poster presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, EnglishThree-dimensional tracking of ejecta particle: Effects of boulder size on ejecta velocity distributionPoster presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, English低強度粗粒レゴリス層における衝突エジェクタ速度スケール則に関する実験的研究Poster presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, Japanese土星リング粒子を模擬した多孔質氷球の低速度衝突実験:反発係数及び付着特性に対する空隙率依存性Oral presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, Japanese彗星核を模擬した多孔質氷に対する高速度衝突実験:衝突残留熱へのエネルギー分配率Oral presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, Japanese層構造試料を用いた衝突破壊実験:デジタル画像相関法による衝突破片速度分布の計測法の開発Poster presentation
- 日本地球惑星科学連合2021年大会, Jun. 2021, Japanese低空隙多孔質氷標的を用いた高速度衝突実験:運動量輸送およびクレーター形成過程に関する実験的研究Poster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishExperimental Study on Restitution Coefficients of Porous Ice Ball Simulating Saturn’s Ring ParticlesPoster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishExperimental Study on Impact Craters Formed on Mountain-Like Surface Topography of AsteroidsPoster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishHigh Velocity Impact Experiments on Porous Ice Aggregates Simulating Cometary Nuclei Surface: Measurements of Post Shock Temperature around Impact CraterPoster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishCrater Size Scaling Law and Impact-Induced Seismic Shaking on Rubble-Pile AsteroidsPoster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishThree-Dimensional Tracking of Various Sized Glass Beads Ejected from Impact CraterPoster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishImpact Cratering Experiments on Granular Targets Simulating Surface Layer on Asteroid 162173 Ryugu: Crater Scaling Law and Impact-Induced Seismic ShakingPoster presentation
- 52nd Lunar and Planetary Science Conference, Mar. 2021, EnglishA HYBRID SPH-SSDEM FRAMEWORK FOR END-TO-END IMPACT CRATERING MODELINGOral presentation
- 天体の衝突物理の解明 (XVI) / 第12回スペースガード研究会 ~プラネタリーディフェンスの現況~, Mar. 2021, Japanese低空隙多孔質氷標的を用いた高速度衝突実験:運動量輸送およびクレーター形成過程に関する実験的研究Poster presentation
- 天体の衝突物理の解明 (XVI) / 第12回スペースガード研究会 ~プラネタリーディフェンスの現況~, Mar. 2021, Japanese層構造試料を用いた衝突破壊実験:デジタル画像相関法による衝突破片速度分布の計測法の開発Poster presentation
- Mar. 2021, Japaneseガラスビーズを用いた低速度クレーター形成実験:学生実験のデータ統計解析Poster presentation
- 天体の衝突物理の解明 (XVI) / 第12回スペースガード研究会 ~プラネタリーディフェンスの現況~, Mar. 2021, Japanese低強度レゴリスにおける衝突エジェクタ速度スケール則に対する実験的研究Oral presentation
- 天体の衝突物理の解明 (XVI) / 第12回スペースガード研究会 ~プラネタリーディフェンスの現況~, Mar. 2021, Japanese土星リング粒子を模擬した多孔質氷球の低速度衝突実験:反発係数及び付着特性に対する空隙率依存性Oral presentation
- 天体の衝突物理の解明 (XVI) / 第12回スペースガード研究会 ~プラネタリーディフェンスの現況~, Mar. 2021, Japanese多孔質氷天体のクレーター形成における衝突残留温度計測Oral presentation
- 令和2年度 宇宙科学に関する室内実験シンポジウム, Mar. 2021, Japanese小惑星リュウグウ表層を模擬した粉粒体層に対するクレーター形成実験Oral presentation
- 令和2年度 宇宙科学に関する室内実験シンポジウム, Mar. 2021, JapaneseフラッシュX線による衝突破片の速度ー質量分布の計測Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japanese土星リング粒子を模擬した多孔質氷球の非弾性衝突メカニズムに関する実験的研究Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japanese衝突残留熱と小惑星母天体の熱変成過程に関する実験的研究Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japaneseはやぶさ2SCIによる人工クレーター形成に伴う小惑星リュウグウの再表面化過程Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japaneseラブルパイル天体に適用可能なクレータースケール則と衝突励起振動に関する実験的研究Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japanese小惑星の起伏地形上に形成するクレーターに関する実験的研究Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japaneseクレーター形成時のエジェクタ放出過程におけるサイズごとの三次元粒子追跡Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japanese多孔質氷天体を模擬したクレーター形成実験:衝突残留熱の計測Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, Japanese低強度標的を用いた高速度衝突破壊実験:衝突破壊強度と引っ張り強度の関係Oral presentation
- 日本惑星科学会2020年度秋季講演会, Nov. 2020, JapaneseフラッシュX線による衝突破片の速度ー質量分布の計測:粘土を用いた延性標的の衝突破壊実験Oral presentation
- 52nd Meeting of the AAS Division for Planetary Sciences, Oct. 2020, EnglishResurfacing processes on asteroid (162173) Ryugu caused by an artificial impact of Hayabusa2’s Small Carry-on ImpactorPoster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, Japanese弱い強度を持つ表面への衝突クレーター形成実験とクレータースケール則の構築Poster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, Japanese土星リング粒子を模擬した多孔質氷球の低速度衝突実験:反発係数に対する空隙率依存性と非弾性衝突のメカニズムPoster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, Japanese氷微惑星の衝突破壊強度に対する斜め衝突の効果Oral presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, Japanese多孔質氷上のクレーター形成に伴う衝突残留温度の計測Oral presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, Japanese低強度標的を用いた衝突破壊実験:引張強度と衝突破壊強度の関係Poster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, Japanese極低温下における多孔質氷のクレーター形成実験:重力支配域のクレータースケール則の構築Poster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, EnglishEffects of surface topography on ejecta growth and crater formation processPoster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, EnglishThree-dimensional tracking of various sized glass beads ejected from crater formed by high-velocity impactPoster presentation
- JpGU-AGU Joint Meeting 2020, Jul. 2020, EnglishImpact experiments for crater scaling laws and impact-induced seismic shaking on rubble-pile asteroidsOral presentation
- 51st Lunar and Planetary Science Conference, The Woodlands, Texas, Mar. 2020, English, International conferenceThermophysical Property of the Artificial Impact Crater on Asteroid RyuguPoster presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceShape Reconstruction of the Asteroid Ryugu with Structure-from-Motion MethodPoster presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceVisible Color of the Artificial Crater on Ryugu Created by Small Carry-On ImpactorPoster presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceCentaur Environment and Surface Activity Measurement Experiment (Cesame)Poster presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceInitial Results of Hayabusa2 Impact Experiment and Observations of Impact Ejecta and CraterOral presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceMorphological and Spectral Analysis of S-Type Bright Boulders on RyuguOral presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferencePaucity of Boulders in Shallow Craters on Asteroid 162173 RyuguOral presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceAn Absence of Seismic Shaking on Ryugu Induced by the Impact Experiment on the Hayabusa2 MissionOral presentation
- 51st Lunar and Planetary Science Conference, Mar. 2020, The Woodlands, Texas, International conferenceThe Effect of Sphere Packing onto the Dynamics in the Gravitational Field of Rubble-Pile Asteroids: Applications to Ryugus' EjectaOral presentation
- American Geophysical Union(AGU) Fall Meeting 2019, Dec. 2019, English, International conferenceArtificial impact crater formed by Hayabusa2 small carry-on impactor on the surface of asteroid Ryugu[Invited]Invited oral presentation
- American Geophysical Union(AGU) Fall Meeting 2019, Dec. 2019, San FranciscoThe Evolution of Asteroid Ryugu Revealed by Hayabusa2 and Implications for Sample Analyses[Invited]Invited oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学クレーター形成時のエジェクタ放出過程における三次元粒子追跡Poster presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学バルジ地形に形成される衝突クレーターに関する実験的研究Poster presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学多孔質天体を模擬した雪のクレーター形成実験及び衝突残留熱の計測Poster presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学フラッシュX線による衝突破片の速度-分布の観測:乾燥粘土を用いた強度と空隙率に対する依存性の研究Poster presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学始原的隕石母天体を模擬した衝突破壊に関する実験的研究Poster presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学SCI クレータから放出されたイジェクタ粒子のサイズ推定 衝突によるラブルパイル天体の自転速度変化Oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学リュウグウ表層を模擬した低強度粗粒レゴリスに対するクレーター形成実験Oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学氷微惑星を模擬した氷球の斜め衝突実験Oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学石膏及びガラス球の衝突破壊強度に対する斜め衝突の影響Oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学物質強度を変化させた模擬小惑星標的を用いた高速度クレーター形成実験 ~クレータースケール則の導出、エジェクタ放出過程の解析~Oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学土星リング粒子を模擬した多孔質氷球の反発及び付着に関する実験的研究Oral presentation
- 第15回衝突研究会 研究集会, Nov. 2019, 千葉工業大学はやぶさ2-SCIとDCAM3による宇宙衝突実験Invited oral presentation
- 日本惑星科学会2019年秋季大会, Oct. 2019小惑星のレゴリス層を模擬したサイズ頻度分布を持つガラスビーズ標的へのクレーター形成実験Oral presentation
- 日本惑星科学会2019年度秋季講演会, Oct. 2019Hayabusa2人工衝突クレータ生成による岩石サイズ頻度分布への影響Poster presentation
- 日本惑星科学会2019年度秋季講演会, Oct. 2019はやぶさ2衝突装置によって生成されたイジェクタカーテンの解析から推定される小惑星リュウグウの表層物性Poster presentation
- 日本惑星科学会2019年度秋季講演会, Oct. 2019多孔質氷天体を模擬した雪のクレーター形成実験:衝突溶融と衝突残留熱に関する研究Poster presentation
- 日本惑星科学会2019年度秋季講演会, Oct. 2019リュウグウ表層を模擬した低強度粗粒標的に対するクレーター形成実験Poster presentation
- 日本惑星科学会2019年度秋季講演会, Oct. 2019低強度標的を用いたクレーター形成実験:エジェクタ放出過程の解析Oral presentation
- 日本惑星科学会2019年秋季大会, Oct. 2019, 京都産業大学土星リング粒子を模擬した多孔質氷球の反発及び付着に関する実験的研究Poster presentation
- 日本惑星科学会2019年秋季大会, Oct. 2019, 京都産業大学小惑星Ryuguでの宇宙衝突実験におけるクレーターからの放出物のその場観測Poster presentation
- 日本惑星科学会2019年秋季大会, Oct. 2019, 京都産業大学フラッシュX線を用いた衝突破壊現象の観測:多孔質標的の破片速度分布に対する空隙の効果Oral presentation
- 日本惑星科学会2019年秋季大会, Oct. 2019, 京都産業大学小惑星リュウグウのクレーターと周辺ボルダーの関係に着目した表層の層構造の推定Oral presentation
- 日本惑星科学会2019年秋季大会, Oct. 2019, 京都産業大学探査機はやぶさ2のリュウグウ近傍探査の総括Oral presentation
- EPSC-DPS Joint Meeting 2019, Sep. 2019, Geneva, SwitzerlandIn-situ observation of catastrophic disruption of asteroid analogues using flash X-ray photographyOral presentation
- EPSC-DPS Joint Meeting 2019, Sep. 2019, Geneva, SwitzerlandImpact experiments on granular targets with size frequency distribution similar to asteroid 162173 RyuguOral presentation
- EPSC-DPS Joint Meeting 2019, Sep. 2019, Geneva, SwitzerlandFirst result of Hayabusa2 impact experiment on RyuguOral presentation
- サイエンスパブ「西条 酒蔵×宇宙」, Jul. 2019, Japanese, ライトダウンin東広島2019実行委員会, 泉ホール(広島県東広島市), Domestic conferenceはやぶさ2による小惑星探査と宇宙衝突実験Invited oral presentation
- Annual Meetings of the Meteoritical Society, Jul. 2019, English, Sapporo, International conferenceHayabusa2: Current SummaryOral presentation
- Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conferenceExperimental study on collisional processes of highly porous ice ballssimulating Saturn’s ring particlesOral presentation
- Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conferenceHigh velocity cratering experiments on sand-gypsum targets simulating asteroidsOral presentation
- Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conferenceExperimental study on compaction process of highly porous ice: Implications for density change of icy regolith layer on icy bodiesOral presentation
- Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, International conferenceThe shape and origin of the rubble-pile asteroid Ryugu[Invited]Invited oral presentation
- Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conferenceObservation of catastrophic destruction of two different targets using X Ray photographyPoster presentation
- Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, International conferenceImpact experiments on low strength coarse-grained regolith simulating surface materials on asteroid RyuguPoster presentation
- Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, International conferenceImpact experiment on asteroid Ryugu by Small-Carry on impactor of Hayabusa-2 and observation of the impact ejecta by a Deployable CAMera-3[Invited]Invited oral presentation
- Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, International conferenceImpact cratering experiments on glass beads with bead size freuency distribution: Implications for cratering process on asteroid RyuguOral presentation
- Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, International conferenceExperimental study on impact crater formed on bulgePoster presentation
- Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conferenceExperimental study on collision destruction simulating the primitive meteorite parent bodyPoster presentation
- Lunar and Planetary Science Conference, Mar. 2019, English, Houston, International conferenceHigh porosity nature of the top-shape C-type asteroid 162173 Ryugu as observed by Hayabusa2Oral presentation
- 50th Lunar and Planetary Science Conference, Mar. 2019, English, The Woodlands Waterway Marriott Hotel and Convention Center, Texas, International conferenceHayabusa2 mission up to nowPoster presentation
- 第2回月着陸探査研究会, Feb. 2019, Japanese, 奥州宇宙遊学館(国立天文台 水沢キャンパス内), Domestic conference国際宇宙探査のための人材育成[Invited]Invited oral presentation
- 衝突研究会, Dec. 2018, Japanese, 神戸, Domestic conferenceHayabusa2 DCAM3 による衝突実験観測の計画と準備状況Poster presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference低強度粗粒レゴリスを用いた衝突実験:クレータースケール則と衝突励起振動に対する粒子強度の影響Poster presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference多孔質氷球の反発係数の空隙率依存性:土星リング粒子の衝突過程に関する実験的研究Poster presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference多孔質氷への高速度クレーター形成実験:クレーターサイズスケール則に対する衝突溶融の影響Poster presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference多孔質氷の圧縮変形における圧密速度と空隙率の関係:氷微惑星の密度構造への応用Poster presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference多孔質天体上に形成する衝突クレーター周囲の衝突残留温度に関する実験的研究Poster presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference高空隙率シリカ層への衝突実験とクレータリングにおける空隙率の効果Oral presentation
- 日本惑星科学会2018年秋季講演会, Oct. 2018, Japanese, 旭川市科学館サイパル, Domestic conference異なる粒径をもつ粒⼦の混合層へのクレーター形成実験:⼩惑星Ryugu 上のクレーター地形との⽐較Poster presentation
- 15th Annual Meeting Asia Oceania Geosciences Society(AOGS), Jun. 2018, English, Honolulu, Hawaii, U.S.A., International conferenceMission Status of Hayabus2 - Final Approach to Asteroid RyuguOral presentation
- Asia Oceania Geosciences Society(AOGS) 15th Annual Meeting, Jun. 2018, English, Honolulu, Hawaii, International conferenceMission status of Hayabus2 - Final approach to asteroid RyuguOral presentation
- 日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conference氷微惑星を模擬した氷球の斜め衝突実験Poster presentation
- 日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conference日本惑星科学会による,惑星探査ロードマップPoster presentation
- 日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conference多孔質氷天体上への高速度クレーター形成実験:クレーターサイズスケール則に対する衝突溶融度の影響Poster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conferenceImpact experiment on asteroid Ryugu using Small Carry-on Impactor and Deployable CAMera-3[Invited]Invited oral presentation
- 日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conferenceフラッシュX線を用いた凍結粘土の衝突破壊過程のその場観察Oral presentation
- Japan Geoscience Union Meeting, May 2018, English, Makuhari Messe, Chiba, International conferenceThermal conductivity of natural soils and implication to grain size estimate using thermal inertiaOral presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conferenceThermal conductivity of lunar regolith simulant and implication to grain size estimate using thermal inertiaPoster presentation
- Japan Geoscience Union Meeting, May 2018, English, Makuhari Messe, Chiba, International conferenceSearching SCI craters: Results of a Hayabusa2 landing site selection dry-runPoster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conferenceSearching SCI craters: Results of a Hayabusa2 landing site selection dry-runPoster presentation
- 9th Workshop on Catastrophic Disruption in the Solar System(CD9), May 2018, English, Ikuta Shirine Hall, International conferenceImpact experiments on porous gypsum and glass simulating rocky planetesimals and proto-planets: Collisional properties in oblique impactsOral presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conferenceImpact experiment on asteroid Ryugu using Small Carry-on Impactor and Deployable CAMera-3[Invited]Invited oral presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conferenceImpact cratering experiments on quartz sand block consolidated by porous gypsum: Implication for crater scaling law in low strength regimePoster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conferenceImpact cratering experiments on quartz sand block consolidated byporous gypsum: Implication for crater scaling law in low strengthregimePoster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conferenceHigh-velocity impact experiments on porous gypsum simulating C-type asteroids: In-situ measurements of post shock temperature around impact craterOral presentation
- 9th Workshop on Catastrophic Disruption in the Solar System (CD9), May 2018, English, Ikuta Jinja Kaikan: IKUTA Shirine Hall, International conferenceExperimental study on scaling laws for high-velocity impact phenomena on water icy targets.[Invited]Invited oral presentation
- 9th Workshop on Catastrophic Disruption in the Solar System (CD9), May 2018, English, Ikuta Shrine, Kobe, International conferenceExperimental study on oblique impacts with various projectilesPoster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conferenceExperimental study on crater size scaling law of porous silica layerPoster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conferenceExperimental study on crater size scaling law of porous silica layerPoster presentation
- 日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conferenceC型小惑星を模擬した多孔質石膏の高速度衝突実験:衝突クレーター近傍の衝突残留熱のその場計測Keynote oral presentation
- Japan Geoscience Union Meeting, May 2018, English, Makuhari Messe, Chiba, International conferenceConceptual Study of Deployable Camera 5 for Martian Moons Exploration missionPoster presentation
- Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conferenceConceptual Study of Deployable Camera 5 for Martian Moons Exploration missionPoster presentation
- 日本惑星科学会2017年度秋季講演会, Sep. 2017, Japanese, 大阪大学 豊中キャンパス, Domestic conference雪標的に作られる衝突クレーター地形Poster presentation
- 日本惑星科学会2017年度秋季講演会, Sep. 2017, Japanese, 大阪大学 豊中キャンパス, Domestic conference火星衛星探査計画のための分離カメラ (MMX-DCAM5) の検討状況Oral presentation
- 日本惑星科学会2017年度秋季講演会, Sep. 2017, Japanese, 大阪大学 豊中キャンパス, Domestic conferenceフラッシュX線を用いた衝突破壊現象の観測Oral presentation
- 日本惑星科学会2017年度秋季講演会, Sep. 2017, Japanese, 大阪大学 豊中キャンパス, Domestic conferenceクレーターイジェクタのスケール則に対する衝突速度依存性Oral presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference隕石を模擬した試料の衝突破壊強度の確率分布と小惑星強度のサイズ依存性への応用Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference多孔質氷の流動則に対する空隙率の効果Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference石英砂への高速度クレーター形成実験:クレーターサイズとエジェクタ速度分布スケール則構築Oral presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference高空隙率シリカ層への衝突実験と空隙率を考慮したクレーターサイズスケール則の構築Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference含水率を変化させた粒子層への高速度衝突クレーター形成実験Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conferenceレゴリス層に形成されるエジェクタカーテン解析法の提案:はやぶさ2小型搭載型衝突装置による衝突実験への応用Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conferenceイトカワ分光画像解析と「はやぶさ2」可視カメラの光学特性解析Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceThermal conductivity of sintered glass beads: measurements, modeling and implication to thermal evolution of planetesimalPoster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceTemperature calculation of coarse-grained regolith surface on small bodiesOral presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferencePlanetary Regolith in Vacuum: Thermal Conductivity Models, Thermal Inertia.Uncertainties and Possible Ways of ImprovementOral presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceNovel method for analyzing ejecta curtain growth of impact crater formed on regolith layer: Implication for impact phenomena made by Hayabusa-2 Small carry-on impactorPoster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceMulti-band image analysis of Itokawa and optical properties analysis of Hayabusa2/ONC-TPoster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceMartian Moons eXploration (MMX): connecting small bodies with habitable planetsOral presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceHow to investigate surface regolith on small bodies with Deployable Cameras (DCAM)Poster presentation
- JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conferenceDESTINY+ミッション:小型衛星による流星群母天体フライバイOral presentation
- JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conferenceConceptual Study of Small Active Seismic Exploration Package on Moons and Small BodiesPoster presentation
- 48th Lunar and Planetary Science Conference, Mar. 2017, English, The Woodlands Waterway Marriott Hotel and Convention Center, International conferenceThermal conductivity model for powdered materials under vacuum based on experimental studiesPoster presentation
- 48th Lunar and Planetary Science Conference, Mar. 2017, English, The Woodlands Waterway Marriott Hotel and Convention Center, International conferenceThermal conductivity measurement of sintered glass beads and implication for thermal evolution of planetesimalPoster presentation
- 天体の衝突物理の解明(XII)〜水質変成から探る太陽系物質進化〜, Nov. 2016, Japanese, 神戸大学六甲台キャンパス, Domestic conference氷分化天体の衝突破壊実験Poster presentation
- 天体の衝突物理の解明(XII)〜水質変成から探る太陽系物質進化〜, Nov. 2016, Japanese, 神戸大学六甲台キャンパス, Domestic conference凍結砂を用いた強度支配域の衝突クレーター形成過程に関する実験的研究Oral presentation
- 天体の衝突物理の解明(XII)〜水質変成から探る太陽系物質進化〜, Nov. 2016, Japanese, 神戸大学六甲台キャンパス, Domestic conference含水砂へのクレーター形成実験:SCI衝突実験解析に向けてOral presentation
- DPS 48/EPSC 11 Meeting, Oct. 2016, English, Pasadena Convention Center, International conferenceEffect of oblique impact on impact strength of planetesimalsPoster presentation
- 日本惑星科学会2016年秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conference模擬氷天体地殻を用いた強度支配域のクレータースケール則に関する実験的研究Oral presentation
- 日本惑星科学会2016年度秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conference石英ガラス球の衝突破壊実験における斜め衝突の効果Oral presentation
- 日本惑星科学会2016年度秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conferenceペネトレータを用いた天体表層の物性探査Oral presentation
- 日本惑星科学会2016年秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conferenceペネトレータを用いた天体表層の物性探査Oral presentation
- 日本惑星科学会2016年秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conferenceセレスのクレーター形状と表層物性の推定Oral presentation
- 日本惑星科学会2016年秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conferenceエジェクタ速度分布スケール則の構築とはやぶさ2インパクター衝突による地形変化領域の考察(ポスター)Poster presentation
- 日本惑星科学会2016年秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conferenceエジェクタ速度分布スケール則の構築とはやぶさ2インパクター衝突による地形変化領域の考察Oral presentation
- 日本惑星科学会2016年度秋季講演会, Sep. 2016, Japanese, ノートルダム清心女子大学, Domestic conferenceエジェクタ速度分布スケール則の構築とはやぶさ2インパクター衝突による地形変化領域の考察Oral presentation
- 日本惑星科学会2016年度秋季講演会, Aug. 2016, Japanese, ノートルダム清心女子大学, Domestic conference氷天体地殻を用いた強度支配域のクレータースケール則に関する実験的研究Oral presentation
- 研究会「衝突・振動による固体天体表面進化と粉体物理」, Aug. 2016, Japanese, 名古屋大学, Domestic conference真空中粉粒体の熱伝導率モデルOral presentation
- 研究会「衝突・振動による固体天体表面進化と粉体物理」, Aug. 2016, Japanese, 名古屋大学, Domestic conference衝突励起振動とエジェクタ速度分布の実験的研究Oral presentation
- 日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference粒径分布と不規則粒子形状が粉体熱伝導率に与える影響の実験的調査Oral presentation
- 日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference凍結砂を用いた強度支配域のクレータースケール則に関する実験的研究Poster presentation
- 日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference岩石天体の衝突破壊に対する斜め衝突の効果Poster presentation
- 日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conferenceレゴリス層を模擬した粉粒体を伝播する衝突励起振動に関する実験的研究Oral presentation
- 日本地球惑星科学連合2016年大会, May 2016, English, 幕張メッセ, Domestic conferenceThe survey of physical properties of planetary subsurface using penetratorPoster presentation
- 日本地球惑星科学連合2016年大会, May 2016, English, 幕張メッセ, International conferenceGeophysical experiments on Phobos proposed for JAXA Mars Moon Exploration missionPoster presentation
- 日本地球惑星科学連合2016年大会, May 2016, English, 幕張メッセ, Domestic conferenceDeployable Camera system 5 (DCAM5) proposed for Martian Moon Exploration mission (MMX)Poster presentation
- Phobos, Deimos, and Mars Workshop, Apr. 2016, English, Earth-Life Science Institute, Tokyo Institute of Technology, International conferenceGeophysical experiments on Phobos proposed in MMXPoster presentation
- Phobos MMX Science Workshop, Apr. 2016, English, Technische Universität Berlin, International conferenceGeophysical Experiment Package and Deployable Camera proposed in MMXOral presentation
- Phobos MMX Science Workshop, Apr. 2016, English, Technische Universität Berlin, International conferenceDCAM5 in MMX: Multi-deployable cameraPoster presentation
- MISASA VI "Frontiers in Earth and Planetary Materials Research", Mar. 2016, English, Institute for Study of the Earth's Interior, Okayama University, Institute for Study of the Earth's Interior, Okayama University, International conferenceOblique impact experiments on porous gypsum and silica glass spheres simulating planetesimalsPoster presentation
- Phobos, Deimos, and Mars Workshop, Feb. 2016, English, Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo Institute of Technology, International conferenceDCAM5 in MMXOral presentation
- 天体の衝突物理の解明(XI)~衝突研究における状態方程式の役割~, Nov. 2015, Japanese, 北海道大学低温科学研究所, 北海道大学低温科学研究所, Domestic conference粉粒体を伝播する衝突励起震動に関する実験的研究Oral presentation
- 天体の衝突物理の解明(XI)~衝突研究における状態方程式の役割~, Nov. 2015, Japanese, 日本地球惑星科学連合, 北海道大学低温科学研究所, Domestic conference氷・石英砂混合標的に対する高速度クレーター形成実験Oral presentation
- 天体の衝突物理の解明(XI)~衝突研究における状態方程式の役割~, Nov. 2015, Japanese, 北海道大学低温科学研究所, 北海道大学低温科学研究所, Domestic conference石膏球の斜め衝突破壊実験Oral presentation
- 天体の衝突物理の解明(XI)~衝突研究における状態方程式の役割~, Nov. 2015, Japanese, 北海道大学低温科学研究所, 北海道大学低温科学研究所, Domestic conference衝突貫入時の加速度計測による惑星表面の力学的性質の調査Poster presentation
- 衝突研究会, Nov. 2015, Japanese, 北海道大学, Domestic conferenceHayabusa2/DCAM3 による衝突実験観測Poster presentation
- 日本惑星科学会2015年度秋季講演会, Oct. 2015, Japanese, 日本惑星科学会, 東京工業大学, Domestic conference密度の異なる弾丸を用いた高速度クレーター形成実験:衝突励起地震の弾丸物質依存性Oral presentation
- 日本惑星科学会2015年度秋季講演会, Oct. 2015, Japanese, 日本惑星科学会, 東京工業大学, Domestic conference氷・砂レゴリス層へのクレーター形成実験Poster presentation
- 日本惑星科学会2015年度秋季講演会, Oct. 2015, Japanese, 日本惑星科学会, 東京工業大学, Domestic conference熱進化した氷天体の衝突破壊現象の解明Oral presentation
- 日本惑星科学会2015年秋季講演会, Oct. 2015, Japanese, 日本惑星科学会, 東京工業大学, Domestic conference多孔質球の斜め衝突実験:衝突破壊強度に対する衝突角度の影響Oral presentation
- 日本惑星科学会2015年度秋季講演会, Oct. 2015, Japanese, 日本惑星科学会, 東京工業大学, Domestic conference月レゴリス層の熱伝導率モデルと LRO/Diviner データを用いた検証Poster presentation
- 日本惑星科学会 2015年度 秋季講演会, Oct. 2015, Japanese, 日本惑星科学会, 東京工業大学, Domestic conferenceフォボス・デイモスの熱環境の再評価Oral presentation
- IAU XXIX General Assembly, Aug. 2015, English, International Astronomical Union, Hawaii Convention Center, International conferenceExperimental study on propagation process of impact-induced seismic wave in quartz sand simulating asteroid regolith layerPoster presentation
- IAU XXIX General Assembly, Aug. 2015, English, International Astronomical Union, Hawaii Convention Center, International conferenceExperimental study on impact disruption of porous asteroids: Effects of oblique impact and multiple collisions on impact strengthOral presentation
- 第48回 月・惑星シンポジウム, Jul. 2015, Japanese, 宇宙航空研究開発機構, 宇宙航空研究開発機構 宇宙科学研究所, Domestic conferenceレゴリスの圧縮による熱伝導率の変化と月表層レゴリスの熱伝導率分布Oral presentation
- 30th International Symposium on Space Technology and Science, Jul. 2015, English, International Symposium on Space Technology and Science, International Electric Propulsion Conference, Nano-satellite Symposium, Kobe International Conference Center, International conferenceScientific Camera System in Hayabusa2 DCAM3: Its objective and system configuration for observation of SCI asteroid impact experimentOral presentation
- 日本地球惑星科学連合 2015年度連合大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conference氷・石英砂混合標的に対する高速度クレーター形成実験Oral presentation
- 日本地球惑星科学連合 2015年度連合大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conference氷・岩石混合物のレオロジーに関する実験的研究:宇宙雪氷学的応用[Invited]Invited oral presentation
- 日本地球惑星科学連合2015年度連合大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conference粘性流体へのクレーター形成実験:彗星核上のクレーターの形成及び緩和過程への応用Poster presentation
- 日本地球惑星科学連合 2015年度連合大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conference多孔質石膏標的に対する斜め衝突破壊実験Poster presentation
- 日本地球惑星科学連合2015年度連合大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conference衝突クレーター形成に伴うイジェクタ速度分布に関する実験的研究Oral presentation
- 日本地球惑星科学連合2015年度連合大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conferenceレゴリス層を模擬した粉粒体を伝播する衝突励起地震に関する実験的研究Oral presentation
- 日本地球惑星科学連合 2015年度連合大会, May 2015, English, 幕張メッセ, Domestic conferenceImaging strategy of DCAM3 equipped on Hayabusa2 based on radiance prediction of imaging objectsOral presentation
- 日本地球惑星科学連合大会2015年大会, May 2015, Japanese, 公益社団法人 日本地球惑星科学連合, 幕張メッセ, Domestic conferenceはやぶさ2搭載分離カメラ(DCAM3)撮像対象物の輝度予測と撮像戦略Oral presentation
- Lunar and Planetary Science Conference, Mar. 2015, English, International conferenceHayabusa2 Deployable Camera 3 (DCAM3) for impact experiment on asteroid: Scientific observation plan and instrument performancePoster presentation
- 平成26年度宇宙科学に関する室内実験シンポジウム, Feb. 2015, Japanese, 宇宙科学研究所, Domestic conference粉粒体を伝播する衝突励起地震に関する実験的研究Oral presentation
- 平成26年度宇宙科学に関する室内実験シンポジウム, Feb. 2015, Japanese, 宇宙科学研究所(神戸大学からTV会議接続で参加), Domestic conference堆積岩に対する斜め衝突クレーター形成実験Oral presentation
- 宇宙科学シンポジウム, Jan. 2015, Japanese, Domestic conferenceSmall Carry-on Impactor (SCI) and Deployable Camera (DCAM3): Asteroid Impact Experiment System on Hayabusa-2Poster presentation
- AIDA international workshop, Oct. 2014, English, International conferenceSmall Carry-On Impactor (SCI) and Deployable Camera 3 (DCAM3) in HAYABUSA-2 MissinonOral presentation
- 日本惑星科学会2014年度秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conference粉流体を伝播する衝突励起地震に関する実験的研究IIOral presentation
- 日本惑星科学会2014年秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conference粉流体を伝播する衝突励起地震に関する実験的研究Oral presentation
- 日本惑星科学会2014年度秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conference氷地殻を模擬した氷・砂混合物に対する高速度クレーター形成実験Oral presentation
- 日本惑星科学会2014年秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conference氷地殻を模擬した氷・砂混合物に対する高速度クレーター形成実験Oral presentation
- 雪氷研究大会(2014・八戸), Sep. 2014, Japanese, 八戸工業大学, Domestic conference雪・氷の二層構造標的上へのクレーター形成実験Oral presentation
- 雪氷研究大会(2014・八戸), Sep. 2014, Japanese, 八戸工業大学, Domestic conference雪の衝突圧密に関する実験的研究Oral presentation
- 日本惑星科学会2014年秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conference真空下における紛体熱伝導率の空隙率依存性測定実験と微惑星の初期熱進化への応用Poster presentation
- 日本惑星科学会2014年秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conference高速度域におけるクレーターエジェクタ速度のスケール則に関する実験的研究Oral presentation
- 日本惑星科学会2014年秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conferenceはやぶさ2分離カメラ (DCAM3-D) の開発状況とサイエンスOral presentation
- 日本惑星科学会2014年秋季講演会, Sep. 2014, Japanese, 東北大学片平キャンパス, Domestic conferenceかんらん岩および玄武岩高速衝突破片の3次元形状分布 : はやぶさ粒子との比較Oral presentation
- Asteroids, Comets, Meteors (ACM) 2014, Jul. 2014, English, Helsinki, Finland, International conferenceExperimental study on the impact-induced seismic wave propagating through granular materials: Implications for a future asteroid missionOral presentation
- Asteroids, Comets, Meteors (ACM) 2014, Jul. 2014, English, Helsinki, Finland, International conferenceExperimental study on ejecta velocity distributions caused by low velocity impactsOral presentation
- 日本地球惑星科学連合大会, May 2014, Japanese, Domestic conference粒径分布が粉体の熱伝導率に与える影響の実験的調査Poster presentation
- 日本地球惑星科学連合大会, May 2014, Japanese, Domestic conferenceはやぶさ2・SCI の地上較正実験: クレーターサイズについてPoster presentation
- 日本地球惑星科学連合大会, May 2014, Japanese, Domestic conferenceはやぶさ2 DCAM3-D の光学性能検証試験Poster presentation
- 日本地球惑星科学連合大会, May 2014, Japanese, Domestic conferenceガラスビーズ焼結体の熱伝導率測定実験と微惑星熱進化への応用Oral presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conference惑星科学界における小型惑星探査計画の検討状況Oral presentation
- 地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conference粉流体を伝播する衝突励起地震に関する実験的研究Oral presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conference氷衛星表面を模擬した氷・砂混合物に対するクレーター形成実験Poster presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conference氷・岩石微惑星の衝突破壊に関する実験的研究:同サイズ天体の衝突破壊に対する衝突角度の影響Oral presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conference多孔質物質の動的圧密実験:微惑星前駆天体の衝突圧密への応用Oral presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, Domestic conference焼結ガラスビーズの熱伝導率と音速の測定実験Poster presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conference砂を伝播する衝突励起応力の減衰過程に関する実験的研究Poster presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conferenceはやぶさ2・SCIの地上較正実験:クレーターサイズについてPoster presentation
- 日本地球惑星科学連合2014年大会, Apr. 2014, Japanese, パシフィコ横浜, Domestic conferenceSmall carry-on impactor of Hayabusa2Oral presentation
- Lunar and Planetary Science Conference, Mar. 2014, English, International conferenceLarge scale impact experiments simulating Small Carry-On Impactor (SCI) equipped on HAYABUSA-2Poster presentation
- 第25回スペースプラズマ研究会, Feb. 2014, Japanese, 宇宙科学研究所, Domestic conference堆積岩への斜め衝突クレーター形成実験Oral presentation
- 第25回スペースプラズマ研究会, Feb. 2014, Japanese, 宇宙科学研究所, Domestic conference「はやぶさ2」SCI の地上較正実験Oral presentation
- 平成25年度スペースプラズマ研究会, Feb. 2014, Japanese, 宇宙科学研究所, Domestic conferenceフラッシュX線を用いた衝突圧密に関する実験的研究Oral presentation
- 宇宙科学シンポジウム, Jan. 2014, Japanese, Domestic conferenceはやぶさ2小型搭載型衝突装置と分離カメラによるサイエンスPoster presentation
- 「日本における超高速衝突実験の現状と将来展望」研究会, Dec. 2013, Japanese, 宇宙科学研究所, Domestic conference神戸大における惑星衝突実験の現状と将来Oral presentation
- 5th Subaru International Conference: Exoplanets and Disks: Their Formation and Diversity II, Dec. 2013, English, Sheraton Kona Resort and Spa at Keauhou Bay, Kailua-Kona, Hawai'i Island, USA, International conferenceImpact strength of small icy bodies experienced multiple collisionsPoster presentation
- 日本惑星科学会秋季講演会, Nov. 2013, Japanese, Domestic conference粉体物質の熱伝導率測定実験と月惑星表層の熱伝導率構造Oral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conference普通コンドライト母天体を形成した微惑星の低速度衝突実験:同サイズ試料の衝突破壊に対する斜め衝突の影響Oral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conference事前衝突を経験した多結晶氷の衝突破壊条件に関する実験的研究:氷天体の蓄積ダメージの見積もりOral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conference砂への低速度衝突による衝突励起地震の観測Poster presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceはやぶさ2搭載 DCAM3-D 用 CMOS 光学センサの性能評価Poster presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceはやぶさ2小型衝突装置の中空弾丸がクレーター形成過程に及ぼす影響Poster presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceはやぶさ2 DCAM3-D の光学性能検証試験Oral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceクレーターエジェクタの速度分布に関する実験的研究:Wada's methodの応用Oral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceカンラン岩ターゲットへの高速度衝突により放出される破片の3次元形状分布Oral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceガラスビーズ焼結体の熱伝導率測定と微惑星熱進化への応用Oral presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceイジェクタカーテン観測からイジェクタの放出角度と速さを測定する方法Poster presentation
- 日本惑星科学会2013年度秋季講演会, Nov. 2013, Japanese, 石垣市民会館, Domestic conferenceHayabusa-2 DCAM3-D の耐環境設計と検証試験Oral presentation
- 第57回宇宙科学技術連合講演会, Oct. 2013, Japanese, 鳥取県米子市, Domestic conferenceはやぶさ2衝突装置とその運用についてOral presentation
- 第57回宇宙科学技術連合講演会, Oct. 2013, Japanese, 鳥取県米子市, Domestic conferenceイトカワ再探査による宇宙衝突実験Oral presentation
- 月・惑星シンポジウム, Aug. 2013, Japanese, Domestic conferenceガラスビーズ焼結体のネックの成長による熱伝導率の変化Oral presentation
- 月・惑星シンポジウム, Aug. 2013, Japanese, Domestic conferenceガラスビーズの熱伝導率測定実験: 粒径分布依存性Oral presentation
- 月・惑星シンポジウム, Aug. 2013, Japanese, Domestic conferenceHayabusa-2 分離カメラ (DCAM3) による衝突実験の可視光観測Oral presentation
- Asia Oceania Geosciences Society 10th Annual Meeting, Jun. 2013, English, Asia Oceania Geosciences Society, Brisbane, Australia, International conferenceSmall Carry-on Impactor (SCI): Its Scientific Purpose, Operation, and Observation Plan in Hayabusa-2 Mission[Invited]Invited oral presentation
- 8th Workshop on Catastrophic Disruption in the Solar System, Jun. 2013, English, Hapuna Beach Prince Hotel, International conferenceExperimental study on the impact strength of icy bodies damaged by multiple collisionsOral presentation
- 日本地球惑星科学連合2013年度連合大会, May 2013, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference複数回衝突を受けた氷天体の衝突破壊強度に関する実験的研究Poster presentation
- 日本地球惑星科学連合2013年度連合大会, May 2013, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference雪・氷の二層構造標的上へのクレーター形成実験Oral presentation
- 日本地球惑星科学連合2013年度連合大会, May 2013, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference雪の動的圧密実験:氷微惑星の低速度衝突圧密への応用Poster presentation
- 日本地球惑星科学連合2013年大会, May 2013, Japanese, 日本地球惑星科学連合, 幕張メッセ, Domestic conferenceクレーターエジェクタ速度のスケール則に関する実験的研究Poster presentation
- 日本地球惑星科学連合大会, May 2013, Japanese, Domestic conferenceHayabusa-2 衝突実験観測用カメラ DCAM3 の開発状況Oral presentation
- 44th Lunar and Planetary Science Conference, Mar. 2013, English, Lunar and Planetary Institute (LPI), Universities Space Research Association (USRA), The Woodlands, Texas, USA, International conferenceSmall Carry-On Impactor (SCI): Its Scientific Purpose, Operation, and Observation Plan in Hayabysa-2 MissionPoster presentation
- 44th Lunar and Planetary Science Conference, Mar. 2013, English, Lunar and Planetary Institute (LPI), Universities Space Research Association (USRA), The Woodlands, Texas, USA, International conferenceIn situ flash X-ray observation of crater formation in porous gypsum analogous to low-density asteroidsOral presentation
- 44th Lunar and Planetary Science Conference, Mar. 2013, English, Lunar and Planetary Institute (LPI), Universities Space Research Association (USRA), The Woodlands, Texas, USA, International conferenceExperimental study on impact disruption of rocky rubble-pile bodies: Effect of disruption of constituent boulders on reaccumulation processPoster presentation
- 平成24年度スペースプラズマ研究会, Feb. 2013, Japanese, 宇宙科学研究所, 宇宙科学研究所, Domestic conference堆積岩への斜め衝突クレーター形成実験Oral presentation
- 平成24年度スペースプラズマ研究会, Feb. 2013, Japanese, 宇宙航空研究開発機構 宇宙科学研究所, 神奈川・相模原, Domestic conference石膏への弾丸貫入とクレーター形成のフラッシュX線による可視化実験Oral presentation
- 宇宙科学シンポジウム, Jan. 2013, Japanese, Domestic conferenceはやぶさ2 SCI/DCAM3-D によるサイエンスPoster presentation
- 天体の衝突物理の解明(VIII)~小天体の衝突・軌道進化~, Nov. 2012, Japanese, 衝突研究会/北大低温研, 北大低温研, Domestic conference衝突実験でのクレーターレイの原因Oral presentation
- 宇宙科学技術連合講演会, Nov. 2012, Japanese, 別府, Domestic conferenceはやぶさ2搭載分離カメラによる衝突実験観測ミッションについてOral presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸, Domestic conference分化天体模擬物質への衝突実験Poster presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸大学, Domestic conference複数回衝突が及ぼす氷ターゲットの衝突破壊強度への影響Oral presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸大学, Domestic conference同サイズ微惑星の衝突破壊における破片速度分布Oral presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸, Domestic conference等質量氷ダスト球の衝突破壊実験:破片速度分布の空隙率依存性Poster presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸大学, Domestic conference焼結雪への衝突におけるエジェクタ速度計測Oral presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸大学, Domestic conference火星氷河・凍土を模擬した高濃度岩石粒子を含む氷の静的圧縮強度:強度に対する岩石粒子の粒径の影響Poster presentation
- 日本惑星科学会秋季講演会, Oct. 2012, Japanese, 神戸, Domestic conferenceはやぶさ2 SCI (小型搭載型衝突装置) で目指す衝突の科学Oral presentation
- 日本惑星科学会2012年度秋季講演会, Oct. 2012, Japanese, 日本惑星科学会秋季講演会実行委員会(神戸大学), 神戸, Domestic conferenceはやぶさ2 SCI (小型搭載型衝突装置) で目指す衝突の科学Poster presentation
- 39th COSPAR Scientific Assembly, Jul. 2012, English, LOC-COSPAR 2012, Mysore, India, International conferenceNumerical simulation of trajectories of impact ejecta around a small asteroidOral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference複数回衝突が及ぼす氷ターゲットの衝突破壊強度への影響Oral presentation
- 日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference同サイズ微惑星の低速度衝突に関する実験的研究:衝突破壊強度と破片速度の角度依存性Poster presentation
- 日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference石膏衝突クレーターのフラッシュX線による可視化実験Oral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference衝突破壊実験生成物の3次元形状分布測定Oral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference焼結した多孔質氷球の等質量衝突に関する実験的研究:衝突付着の空隙率依存性Oral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference小型衝突装置(SCI)からのサイエンスOral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conference岩石ラブルパイル天体の衝突破壊強度に関する実験的研究:構成岩塊の破壊が再集積プロセスに及ぼす影響Oral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conferenceはやぶさ2のサイエンスと科学観測機器Oral presentation
- JpGU Meeting 2012, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conferenceコンドライトへの弾丸衝突とエジェクタ回収実験Oral presentation
- 日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉・幕張, Domestic conferenceイトカワ再探査による宇宙衝突実験Poster presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceThe effects of multiple impacts on the impact strength of ice targetsPoster presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceLow-velocity impact experiments of ice and porous gypsum simulating equal-sized planetesimal collisionsPoster presentation
- 日本地球惑星科学連合2012年大会, May 2012, English, 日本地球惑星科学連合, 幕張メッセ, Domestic conferenceLaboratory Experiments of Impact onto Chondrites and Ejecta Recovery.Oral presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceIn-situ flash X-ray observation of projectile penetration and crater formation in porous asteroid analogueOral presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceImpact experiments of metal core-rocky mantle targets: Implication for collisional disruption of iron meteorite parent bodiesOral presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceHayabusa-2, C-type asteroid sample return mission, science targets and instrumentsPoster presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceExperimental study on impact disruption of rocky rubble-pile bodiesOral presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceExperimental study on collisional sticking of isometric sintered porous ice spheresPoster presentation
- Asteroids, Comets, Meteors (ACM) 2012, May 2012, English, ACM2012 日本実行委員会, Niigata, Japan, International conferenceDistribution of impact ejecta around a small asteroid: Implication to artificial impact experiment in Hayabusa-2 mission to the asteroid 1999JU3Oral presentation
- 平成23年度衝撃波シンポジウム, Mar. 2012, Japanese, 千葉・柏(東大・柏キャンパス), Domestic conferenceフラッシュX線を用いた石膏への弾丸貫入とクレーター形成過程のその場観察Oral presentation
- 平成23年度スペースプラズマ研究会,, Feb. 2012, Japanese, 宇宙科学研究所,, Domestic conference分化隕石母天体の衝突破壊と進化Oral presentation
- 平成23年度スペースプラズマ研究会, Feb. 2012, Japanese, 宇宙科学研究所, 宇宙科学研究所, Domestic conference堆積岩に対する衝突クレーター形成実験:大学院生を対象とした人材育成のための衝突実験実習Oral presentation
- 平成23年度スペースプラズマ研究会,, Feb. 2012, Japanese, 宇宙科学研究所, Domestic conferenceフラッシュ X 線による石膏への弾丸貫入とクレーター形成過程のその場観察Oral presentation
- MISASA-IV,, Feb. 2012, English, Kurayoshi, Japan, International conferenceLaboratory experiments of crater formation on basalt and dunite impacted at the velocity higher than 11 km/sPoster presentation
- MISASA IV International Symposium 2012, Feb. 2012, English, 岡山大学, Kurayoshi, Japan, International conferenceImpact ejecta from chondrites, MISASA-IV Solar System Exploration and New Geosciences -Perspective for the Next Decade-Poster presentation
- MISASA-IV,, Feb. 2012, English, Kurayoshi, Japan., International conferenceExperimental study on collisional sticking of isometric porous ice dust spheresPoster presentation
- 日本における超高速衝突実験の現状と将来展望,, Dec. 2011, Japanese, 惑星科学研究センター, Domestic conference模擬ラブルパイル天体の衝突破壊実験とCPS実験実習の報告Oral presentation
- 第6回はやぶさ2から考えるサイエンス研究会, Dec. 2011, Japanese, 惑星科学研究センター, Domestic conferenceSCIからのサイエンスOral presentation
- AGU Fall Meeting 2011, Dec. 2011, English, San Francisco, California, USA, International conferenceImpact experiments of porous gypsum-glass bead mixtures simulating parent bodies of ordinary chondrites: Implications for re-accumulation processes related to rubble-pile formationPoster presentation
- AGU Fall Meeting 2011, Dec. 2011, English, AGU, San Francisco, California, USA, International conferenceA possible formation mechanism of rampart-like ejecta pattern in a laboratoryPoster presentation
- 天体の衝突物理の解明(ⅥI)~巨大天体衝突過程とその影響~,, Nov. 2011, Japanese, 衝突研究会/北大低温研, 北大低温研, Domestic conference粉体への衝突実験で見られるランパート風地形の形成過程Oral presentation
- 天体の衝突物理の解明(ⅥI)~巨大天体衝突過程とその影響~, Nov. 2011, Japanese, 北大低温研, Domestic conference等質量氷ダスト球の衝突付着に関する実験的研究Oral presentation
- 天体の衝突物理の解明(ⅥI)~巨大天体衝突過程とその影響~, Nov. 2011, Japanese, 北大低温研, Domestic conferenceラブルパイル天体の衝突破壊強度に関する実験的研究Oral presentation
- 天体の衝突物理の解明(ⅥI)~巨大天体衝突過程とその影響~, Nov. 2011, Japanese, 北大低温研, Domestic conference10km/s を超える衝突速度でのクレーター形成実験Oral presentation
- 日本惑星科学会2011年秋季講演会, Oct. 2011, Japanese, 日本惑星科学会, 相模女子大学, Domestic conference隕石への超高速衝突実験と塵回収Poster presentation
- , 日本惑星科学会秋季講演会, Oct. 2011, Japanese, ,相模女子大学, Domestic conference等質量氷ダスト球の衝突付着に関する実験的研究Poster presentation
- 日本惑星科学会2011年秋季講演会, Oct. 2011, Japanese, 日本惑星科学会, 相模女子大学, Domestic conference堆積岩への衝突クレーター形成実験Poster presentation
- 日本惑星科学会秋季講演会,, Oct. 2011, English, 相模女子大学, Domestic conference多孔質焼結シリカと石膏を用いた超高速度衝突実験Oral presentation
- 日本惑星科学会2011年秋季講演会, Oct. 2011, Japanese, 日本惑星科学会, 相模女子大学, Domestic conference細かいガラスビーズ層への衝突で見られるランパートクレーターに似たエジェクタ地形の形成過程Oral presentation
- 日本惑星科学会2011年度秋季講演会, Oct. 2011, Japanese, 神奈川・相模女子大学, Domestic conference火星凍土を模擬した氷・固体粒子混合物のレオロジーに関する実験的研究Oral presentation
- 日本惑星科学会2011年秋季講演会, Oct. 2011, Japanese, 日本惑星科学会, 相模女子大学, Domestic conferenceCPS 衝突実験実習の取り組みPoster presentation
- 第44回月・惑星シンポジウム, Aug. 2011, Japanese, 神奈川・相模原(宇宙科学研究本部), Domestic conference普通コンドライト隕石母天体を模擬した石膏・ガラスビーズ混合物の衝突破壊実験Oral presentation
- Asia Oceania Geosciences Society 8th Annual Meeting,, Aug. 2011, English, Taipei, Taiwan, International conferenceLaboratory experiments of crater formation on basalt and dunite impacted at the velocity higher than 11 km/sOral presentation
- Asia Oceania Geosciences Society 8th Annual Meeting, Aug. 2011, English, Taipei, Taiwan, International conferenceExperimental study on the collisional properties of gypsum-glass beads mixturesOral presentation
- Asia Oceania Geosciences Society 8th Annual Meeting,, Aug. 2011, English, Taipei, Taiwan, International conferenceExperimental study on the collisional process of icy planetesimalsPoster presentation
- 17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, Jun. 2011, English, APS, Chicago, Illinois, USA, International conferenceFlyer acceleration by high-power laser and impact experiments at velocities higher than 10 km/sOral presentation
- 17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, Jun. 2011, English, APS, Chicago, Illinois, USA, International conferenceCapture of dusts from hypervelocity collision of planetary materials: Implication for dust size distribution in debris discsPoster presentation
- 日本地球惑星科学連合2011年大会, May 2011, Japanese, ,幕張メッセ,千葉, Domestic conference模擬レゴリス物質の衝突破壊強度の測定Poster presentation
- 日本地球惑星科学連合2011年大会, May 2011, Japanese, 日本地球惑星科学連合, 幕張メッセ,千葉, Domestic conference粉体への衝突実験で見られるクレーター周辺地形の形成過程Oral presentation
- 日本地球惑星科学連合2011年大会, May 2011, Japanese, 千葉・幕張, Domestic conference氷・岩石混合物の流動則に対する岩石粒子のサイズと形状の効果Poster presentation
- ,日本地球惑星科学連合2011年大会, May 2011, Japanese, ,幕張メッセ,千葉, Domestic conference焼結した雪球同士の衝突貫入と付着に関する実験的研究Oral presentation
- ,日本地球惑星科学連合2011年大会, May 2011, Japanese, ,幕張メッセ,千葉, Domestic conferenceラブルパイル天体の衝突破壊に対する間隙物質の影響Oral presentation
- 平成22年度スペースプラズマ研究会・講演集, Mar. 2011, Japanese, 宇宙科学研究所, 宇宙科学研究所, Domestic conference砂岩に対する衝突クレーター形成実験:弾丸密度の効果Oral presentation
- 平成22年度衝撃波シンポジウム, Mar. 2011, Japanese, 日本衝撃波研究会, 青山学院大学, Domestic conference岩石への超高速衝突実験:塵粒子のサイズ分布解析とデブリ円盤への応用Oral presentation
- 42nd Lunar and Planetary Science Conference, Mar. 2011, English, The Woodlands, International conferenceImpact Experiments of Metal Core-Rocky Mantle Targets Simulating Collisional Disruption of Iron Meteorite Parent BodiesOral presentation
- 42nd Lunar and Planetary Science Conference, Mar. 2011, English, The Woodlands, Texas, USA, International conferenceImpact experiments of gypsum-glass beads mixtures simulating parent bodies of ordinary chondritesPoster presentation
- 43rd Lunar and Planetary Science Conference, Mar. 2011, English, The Woodlands, International conferenceExperimental Study on Impact Craters Formed on Basalt Target Covered with Weak Mortar LayerPoster presentation
- 日本惑星科学会2010年秋季講演会, Oct. 2010, Japanese, 名古屋, Domestic conference分化天体の衝突破壊および鉄隕石放出条件の解明Oral presentation
- 日本惑星科学会2010年秋季講演会, Oct. 2010, Japanese, 名古屋大学, Domestic conference氷微惑星の衝突破壊様式と破片速度分布に対する空隙率の効果Oral presentation
- 日本惑星学会秋季講演会, Oct. 2010, Japanese, 日本惑星科学会, 名古屋大学, Domestic conference岩石への小金属球超高速度衝突実験:塵粒子のサイズ分布解析Oral presentation
- 日本惑星科学会2010年秋季講演会, Oct. 2010, Japanese, 名古屋大学, Domestic conference圧子圧入試験による氷・岩石混合物の局所的変形強度の計測Poster presentation
- 日本惑星科学会2010年秋季講演会, Oct. 2010, Japanese, 名古屋, Domestic conferenceラブルパイル構造を持つ天体の衝突破壊の特徴Poster presentation
- 日本惑星科学会2010年秋季講演会, Oct. 2010, Japanese, 名古屋, Domestic conference10km/s を超える衝突速度でのクレーター形成実験Poster presentation
- 12th International Conference on the Physics and Chemistry of Ice, Sep. 2010, English, Sapporo, Japan, International conferenceMeasurements of post shock temperature deposited in ice impact craterPoster presentation
- 12th international Conference on the Physics and Chemistry of Ice, Sep. 2010, English, Sapporo Japan, International conferenceImpact experiments on sintered snowballsPoster presentation
- 12th International Conference on the Physics and Chemistry of Ice, Sep. 2010, English, Sapporo, Japan, International conferenceFlow law of ice-silica mixtures and the effects of silica content and porosityOral presentation
- European Planetary Science Congress 2010, Sep. 2010, English, Europlanet, Rome, Italy, International conferenceEjecta size distribution from hypervelocity impact cratering of planetary materials: Implication for dust production process of impact originOral presentation
- 第43回月・惑星シンポジウム, Aug. 2010, Japanese, 神奈川・相模原(宇宙科学研究本部), Domestic conference氷微惑星の衝突破壊様式と破片速度分布に対する空隙率の効果Oral presentation
- 2010 Western Pacific Geophysics Meeting, Jun. 2010, English, Taipei, Taiwan, International conferenceExperimental Study on the Collisional Disruption of Sintered Snowball with Various PorositiesPoster presentation
- 日本地球惑星科学連合2010年大会, May 2010, Japanese, 千葉・幕張, Domestic conference熱進化する氷微惑星の衝突集積過程に関する実験的研究Oral presentation
- 日本地球惑星科学連合2010年大会, May 2010, Japanese, 千葉・幕張, Domestic conference圧子圧入法を用いた氷物質の変形実験:局所的な変形強度を調べる新しい手法の確立Poster presentation
- 日本地球惑星科学連合2010年大会, May 2010, Japanese, 千葉・幕張, Domestic conferenceマクスウェル粘弾性モデルを用いた小・中氷衛星の地形緩和条件の推定Oral presentation
- レーザー研シンポジウム2010, Apr. 2010, Japanese, 大阪大学レーザーエネルギー学研究センター, 大阪大学レーザーエネルギー学研究センター, Domestic conference宇宙固体物質への高速衝突による塵生成過程の解明のための衝突破片回収実験~惑星系における塵生成のスケーリング則構築に向けて~Poster presentation
- 41st Lunar and Planetary Science Conference, Mar. 2010, English, The Woodlands, Texas, USA, International conferenceMechanical strength of small icy bodies with residual porosity less than 30 %Poster presentation
- 41st Lunar and Planetary Science Conference, Mar. 2010, English, The Woodlands, Texas, USA, International conferenceExperimental study on the collisional disruption of sintered snowball with various porosityOral presentation
- 41st LPSC, Mar. 2010, English, LPI, Woodlands, Texas, USA, International conferenceEjecta size distribution from hypervelocity impact cratering of planetary materialsOthers
- 日本惑星科学会2009年秋季講演会, Sep. 2009, Japanese, 東京・文京区(東大・本郷キャンパス), Domestic conference氷・シリカ混合物の流動則に対する空隙の効果:氷衛星の地形緩和への応用Oral presentation
- 日本惑星科学会2009年秋季講演会, Sep. 2009, Japanese, 東京・文京区(東大・本郷キャンパス), Domestic conference超低密度物質中への貫入過程における突入物質減速メカニズムの速度依存性Oral presentation
- 日本惑星学会秋期講演会, Sep. 2009, Japanese, 日本惑星科学会, 東京大学, Domestic conference超高速度衝突による衝突破片回収実験Oral presentation
- 日本惑星科学会2009年秋季講演会, Sep. 2009, Japanese, 東京・文京区(東大・本郷キャンパス), Domestic conference超高空隙率雪球の衝突破壊と破片速度分布に関する実験的研究Oral presentation
- Asia Oceania Geosciences Society 6th Annual Meeting, Aug. 2009, English, Singapore, International conferenceImpact experiments of sintered snow sphere: Implication for thermal evolution of icy planetesimalsPoster presentation
- Asia Oceania Geosciences Society 6th Annual Meeting, Aug. 2009, English, Singapore, International conferenceFlow law of compacted ice-silica mixtures with residual porosity less than 30 %: Implications for geology of small icy satellitesOral presentation
- 日本地球惑星科学連合2009年大会, May 2009, Japanese, 千葉・幕張, Domestic conference氷・シリカ微粒子混合物の圧密実験とその氷衛星の密度進化への応用Oral presentation
- 日本地球惑星科学連合2009年大会, May 2009, Japanese, 千葉・幕張, Domestic conference超低密度物質への貫入過程におけるトラック形成のその場観察Oral presentation
- 日本地球惑星科学連合2009年大会, May 2009, Japanese, 日本地球惑星科学連合, 幕張メッセ, Domestic conferenceレーザー銃を用いた超高速度衝突による衝突破片回収実験Poster presentation
- 日本惑星科学会2008年秋季講演会, Nov. 2008, Japanese, 九州大学, Domestic conference氷・シリカ微粒子混合物の圧密実験と氷小天体の密度進化への応用Oral presentation
- 日本惑星科学会2008秋季講演会, Nov. 2008, Japanese, 日本惑星科学会, 九州大学, Domestic conferenceレーザー加速弾丸の岩石への高速衝突によるエジェクタの観察Oral presentation
- 共同利用研究集会 特定領域研究「太陽系外惑星科学の展開」ダスト班研究会 天体の衝突物理の解明(IV), Sep. 2008, Japanese, 衝突研究会/北大低温研, 北大低温研, Domestic conferenceレーザー加速弾丸衝突による放出物の検出Poster presentation
- 第41回月・惑星シンポジウム, Aug. 2008, Japanese, 神奈川・相模原(宇宙科学研究本部), Domestic conference氷・シリカ微粒子混合物の変形実験:流動則の温度依存性と脆性ー塑性境界についてOral presentation
- 第41回月・惑星シンポジウム, Aug. 2008, Japanese, 神奈川・相模原(宇宙科学研究本部), Domestic conference焼結した雪球の衝突実験:小微惑星の熱進化と衝突破壊強度の関係Oral presentation
- 日本地球惑星科学連合2008年大会, May 2008, Japanese, 千葉・幕張, Domestic conference普通コンドライト母天体模擬物質の衝突破壊強度に関する実験的研究Poster presentation
- 日本地球惑星科学連合2008年大会, May 2008, Japanese, 千葉・幕張, Domestic conference氷・シリカ混合物の変形実験:流動則に対する温度依存性Oral presentation
- 日本地球惑星科学連合2008年大会, May 2008, Japanese, 千葉・幕張, Domestic conference焼結した雪球の衝突実験:氷小天体の衝突破壊・再集積条件の推定Oral presentation
- Science of Solar System Ices: A Cross-Disciplinary Workshop, May 2008, English, Oxnard, USA, International conferenceExperimental study on the rheology of ice-silica beads mixtures: effects of silica content and temperature on the flow lawPoster presentation
- 日本惑星科学会2007年秋季講演会, Sep. 2007, Japanese, 高知大学, Domestic conference氷クレーターの形成に伴う衝突残留熱に関する実験的研究Oral presentation
- 日本惑星科学会2007年秋季講演会, Sep. 2007, Japanese, 高知大学, Domestic conference高濃度粒子混合氷の粘性率とその氷天体流動地形への応用Oral presentation
- 第40回月・惑星シンポジウム, Jul. 2007, Japanese, 神奈川・相模原(宇宙科学研究本部), Domestic conference氷クレーターの形成に伴う衝突残留熱に関する実験的研究Oral presentation
- IUGG XXIV, Jul. 2007, English, Perugia, Italy, International conferenceEffects of silica particles on the flow law of H2O ice: implication for lobate debris aprons on MarsOral presentation
- 日本地球惑星科学連合2007年大会, May 2007, Japanese, 千葉・幕張, Domestic conference氷・シリカ粒子混合物の変形実験:流動則に対するシリカ粒子の効果と火星のlobate debris apron地形への応用Oral presentation
- 日本地球惑星科学連合2007年大会, May 2007, Japanese, 千葉・幕張, Domestic conference氷クレーターの形成時に発生する衝突残留熱の計測Oral presentation
- 2006年度日本雪氷学会全国大会, Nov. 2006, Japanese, 秋田市民交流プラザALVE, Domestic conference固体粒子を含んだ氷の流動に関する実験的研究とその宇宙雪氷学的応用Oral presentation
- 日本惑星科学会2006年秋季講演会, Oct. 2006, Japanese, 兵庫県立美術館, Domestic conference氷・シリカ粒子混合物の変形実験:流動則に対するシリカ粒子の効果と氷天体テクトニクスへの応用Poster presentation
- 4th International Conference on Mars Polar Science and Exploration, Oct. 2006, English, Davos, Switzerland, International conferenceMechanical strength of ice-silicate mixture depending on the silicate contents and the silicate particle sizesPoster presentation
- 第39回月・惑星シンポジウム, Aug. 2006, Japanese, 神奈川・相模原(宇宙科学研究本部), Domestic conference固体粒子を含んだ氷の力学的性質:粒子濃度とサイズ依存性に関する実験的研究Oral presentation
- 11th International Conference on the Physics and Chemistry of Ice, Jul. 2006, English, Bremerhaven, Germany, International conferenceMechanical strength and flow properties of ice-silicate mixture depending on the silicate contents and the silicate particle sizesPoster presentation
- Asia Oceania Geoscience Society Annual Meeting, Jul. 2006, English, Singapore, International conferenceLunar Elemental Mapping by XRS Onboard SELENE: Science and InstrumentOral presentation
- COSPAR Scientific Assembly, Jul. 2006, English, Beijing, International conferenceCurrent status of X-ray spectrometer development in SELENE projectOral presentation
- 日本地球惑星科学連合2006年大会, May 2006, Japanese, 千葉・幕張, Domestic conference固体粒子を含んだ氷の力学的性質:粒子濃度とサイズ依存性に関する実験的研究Oral presentation
- 日本地球惑星科学連合大会, May 2006, Japanese, 幕張, Domestic conferenceSELENE 搭載蛍光X線分光計による月面詳細元素分布の探査Poster presentation
- Lunar and Planetary Science Conference, Mar. 2006, English, Houston, International conferenceDevelopment of X-ray fluorescence spectrometer onboard SELENEPoster presentation
- International Astronomical UnionJan. 2015 - Present
- Division of Planetary Science, Americam Astronomical SocietyOct. 2020
- 日本雪氷学会
- アメリカ地球物理学連合
- 日本惑星科学会
- 2009 - 2011超高速レーザー銃実験 で解明する惑星間衝突 の物理化学過程
- 2008 - 2010熱進化する微惑星の衝突破壊と小惑星・氷衛星の多様性の起源
- 2005 - 2007彗星表面における衝突クレーター形成過程と彗星の熱史
- 2005 - 2007Crater formation process on the comet surface and the implication to the thermal history of the comet
- 2004 - 2005彗星の衝撃変成による含水鉱物の形成
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Kobe University, 01 Apr. 2022 - 31 Mar. 2026Origin of an extra-large metallic core of Mercury and M-type asteroids inferred from differentiation process between iron and rock at the region of terrestrial planets
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Kobe University, 01 Apr. 2019 - 31 Mar. 2022Study of collisional disruption by using the ultra-high speed X-ray tomography and implication for the diversity of asteroid familiesThe mass-velocity distribution of impact fragments at the time of collisional disruption was measured by analyzing the images taken by Flash X-rays and the images acquired by a high-speed camera by the digital image correlation method. Impact experiments were performed using targets that simulate the various stages of thermal evolution of planetesimals. From the comparison with the numerical simulation, it became clear that the impact strength QD* in the gravity-dominated regime can be estimated from the semi-theoretical formula by using the relationship between the median velocity v* and the energy density Q obtained in the laboratory experiment. It was found that QD* is sensitive to porosity and internal structure, but insensitive to tensile strength.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Japan Aerospace EXploration Agency, 30 Jun. 2017 - 31 Mar. 2022Solar System Exploration for Aqua-planetology本計画研究は、「第1段階(H29・30年度):はやぶさ2探査での観測データの取得準備、近傍観測」、「第2段階(H31・32年度):微惑星・水惑星・氷衛星の水・物質循環に関する地球科学データの抽出」、「第3段階(H33年度):微惑星・水惑星・氷衛星の水・物質循環モデルの構築」からなる。はやぶさ2探査が予定通り進行していることにより、本年度は、小惑星リュウグウのリモートセンシング観測およびそのデータ解析に従事した。得られたリモートセンシングデータから、リュウグウが、小惑星帯に存在した母天体の衝突破壊による破片の再集積で形成されたラブルパイル天体であり、その母天体は水-岩石反応を生じていることが明らかとなった。これらの結果は、査読付き原著論文としてScience誌(Kitazato et al. 2019; Sugita et al. 2019; Watanabe et al. 2019)やAstrophysical Journal Letters誌(Hirabayashi et al. 2019)に掲載されることとなった。
リュウグウの解析に加え、計画班では、将来の火星地下県探査のためのツール開発も行っている。火星には凍土層や水-岩石反応で形成された含水鉱物層が地下に広域的に分布しており、地下圏探査の重要性が示唆されている(Usui et al. 2017 Nature)。我々は、レーダーサウンダー技術を応用し、地下水圏の露出部分であるクレーター壁や渓谷から内部へと続く、地下水圏の水平分布(右図のシンボル部分)を取得する技術を開発した。本技術を火星全域に展開することにより、これまで推察の域を出なかった火星地下水圏マップが作成され、表面地質マップとの対比により、火星表層(大気圏)と内部(水圏)との相互進化解明の鍵を握る地下圏進化への理解へと発展することが期待される。 - Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Kobe University, 01 Apr. 2016 - 31 Mar. 2019To examine the crater scaling law for crater radius of water ice in the gravity regime applicable for crater chronology on Pluto, we developed new vertical gas gun in the cold room and conducted cratering experiments of non-sintered snow at very low temperature. As a result, a bowl-shaped crater cavity, which is a typical crater shape in the gravity regime, was observed under vacuum and at <148 degC, and the crater scaling law could be constructed. We also conducted impact experiments of sintered snow at high impact velocity (>1 km/s) to examine the cratering efficiency, and found that the cratering efficiency was lower than that of polycrystalline ice due to the impact melting. Furthermore, we conducted uniaxial compression tests under constant strain rate on ice-silica mixtures to clarify the tectonics of surface features on icy bodies such as Pluto, and found that the strain rate showing the ductile-to-brittle transition increased with the increase of the silica volume fraction.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2016 - 31 Mar. 2019, Principal investigatorHigh-velocity impact experiments were conducted for asteroid analogues to study the impact strength in a gravity regime. The catastrophic disruption of asteroid analogues with different tensile strength and porosities were observed by using flash X-ray photography, and the relationship between the impact fragment mass and the ejection velocity was obtained. The median velocity, V*, which is an upper limit of ejection velocities of fragments with a half of the original target mass was derived from this relationship and it was found to increase lineally with the energy density but it was independent of the tensile strength. While the V* was drastically affected by the porosity, the V* of the non-porous target was more than 3 time larger than that of the porous targets. These V* of various targets allowed us to estimate the impact strength of asteroid analogues in the gravity regime.Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Chiba Institute of Technology, 01 Apr. 2015 - 31 Mar. 2019In this study, we constructed a light scattering model of ejecta curtain emerging at impact to obtain precious information on target bodies from observation of the ejecta curatin. Conducting numerical simulations and laboratory experiments of impact cratering and light scattering, we revealed the dependence of light scattering on the form and structure of ejecta curtain, the particle size distribution, the particle number density distribution, the scattering phase function of ejecta particles, the solar phase angle, and so on. The products of this study is expected to be applied for the future planetary missions with impact experiments in space.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Kobe University, 01 Apr. 2013 - 31 Mar. 2016, Principal investigatorWe studied the feasibility of development of a Low Gravity Simulator for Impact Phenomena (LoGSIP) in the laboratory; the LoGSIP would be used for the study on the physical properties of granular matters under the low gravity condition simulating a regolith layer of asteroid surface. Then, we developed the method to measure the dynamical resistance force generated from granular matters using the impactor equipped with an accelerometer, and more we developed the method to measure the impact vibration and the excavation process during the crater formation process using the accelerometers set on a target surface and a high speed photography. As a result of these developments, we obtained the basic dynamical properties of granular matters at 1G, and assessed the feasibility of the implementation of these methods to the LoGSIP.Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Ibaraki University, 01 Apr. 2011 - 31 Mar. 2016Our group studied various subjects related to the planet formation process in a protoplanetary disk. Major accomplishments achieved by our collaborations between astronomical observations, theories and impact experiments are as follows: (1) High resolution observations with ALMA and Subaru telescope have revealed that asymmetric structure is quite common in a protoplanetary disk. The regions of dust concentration in such structure may be responsible for the formation of rocky planetesimals. (2) Our theories on planetary gaps show that the ring-like features seen in several protoplanetary disks with different ages can be explained by a gap carved by a protoplanet, suggesting that a planetary system may form in various modes with different timescales. (3) Modeling of chemical reaction network in the formation site of a star-disk system has successfully reproduced spatial distributions and relative abundances of gas molecules, including HDO and N2H+, in a protoplanetary disk.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Chiba Institute of Technology, 01 Apr. 2012 - 31 Mar. 2015The objective of this study is to determine the Hugoniot curve of forsterite, one of the most important silicates, in the density-pressure-temperature-entropy space. We conducted a series of laser shock experiments using a high power laser and obtained shock-induced radiance and shock velocity in forsterite samples under 400-900 GPa compression. Our results indicate that the degree of vaporization of forsterite after shock compression is much higher than previously thought. Hypervelocity impacts at >30 km/s on the Hadean Earth may produce a transient O2-rich atmosphere. This hypothesis can be tested by the geochemical analyses of impact-related geologic record.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2010 - 31 Mar. 2013First, we examined temporary capture of planetesimals by a giant planet, which likely played an important role in capture of irregular satellites of giant planets. Using numerical simulations, we investigated capture rates as well as their dependence on various orbital parameters. Our results suggest that the source region of some of the prograge irregular satellites of Jupiter corresponds to the Hilda region. Next, we examined the process of particle accretion and collisional disruption of aggregates in the tidal environment. We obtained the critical radial distance for particle accretion, and clarified the condition for disruption. Finally, we examined capture of planetesimals by the circumplanetary gas disk of a growing giant planet, which is important in relation to the origin of regular satellites of giant planets. We obtained capture rates and also investigated their dependence on various parameters.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Japan Aerospace Exploration Agency, 2010 - 2012We have introduced a pair of flash X-ray system with the applied voltage of 300kV in order to study the transient phenomena during the high velocity collision among planetary bodies, and we have tried to construct a new perspective of an impact cratering process by means of these apparatus. Then, we succeeded to observe the impact penetration of a projectile and the crater formation accompanied by this penetration. As a result, we have obtained several new results on the laboratory experiments of the projectile penetration and the crater formation on the porous target, the numerical simulation of the excavation flow during the crater formation, and the observation of the ejecta-expansion from the impact point.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Chiba Institute of Technology, 2009 - 2011Laser shock experiments were carried out to investigate the equations of state(EOS) for silicate materials under impact-induced extreme conditions. Based on time-resolved emission spectra, we conclude that electrons behave as an important energy reservoir during impact-driven processes via endothermic shock-induced ionization and exothermic electron recombination. A number of previous studies related to silicate vaporization should be re-visited because the widely used EOS's do not consider such electron behaviors.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 2008 - 2011We develop a new flyer acceleration technique using a high-power laser, Gekko XII, at Osaka University, which can accelerate sheet flyers with a diameter of ~ 0.5 mm and a thickness of ~ 30 - 50 .m and spherical projectiles with a diameter of 0.1 - 0.3 mm to velocities higher than 10 km/s up to 60 km/s. Using this technique, we carry out impact experiments to investigate impact vapor and melt, equation of state, craters, and ejecta. Obtained data are quite new and important for various themes in the field of planetary science.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Nagoya University, 2008 - 2010Impact disruption of planetesimals with layered structure in their interiors could be one of the origins of the density and composition variation observed in asteroids and satellites. Thus, we studied the compaction and the sintering processes of icy planetesimals and also studied the impact process of small icy bodies with various porosities originated from the impact disruption of the sintered bodies, so that we clarified the porosity distribution of the planetesimal interiors and the porosity dependence of the impact strength. Furthermore, we also made impact-cratering experiments on the layered surface of the rocky planetesimals and collisional experiments on the rubble-pile bodies. Thus, we clarified that the effects of layered structures on the crater formation and the effects of fragment number and fragment size of the rubble-pile on the impact disruption.
- 科学研究費補助金, 2008 - 2010熱進化する天体の衝突破壊と太陽系小天体の多様性の起源Competitive research funding
- Grant-in-Aid for Scientific Research, 2008 - 2010Collisional disruption of the thermally evolved bodies and the origin of the variety of small bodies in the solar systemCompetitive research funding
- 共同研究, 2005 - 2010氷・岩石混合物のレオロジーとその宇宙雪氷学的応用Competitive research funding
- Cooperative Research, 2005 - 2010Rheology of ice-rock mixtures and the implication to cosmo-glaciologyCompetitive research funding
- 科学研究費補助金/基盤研究(B), 2010, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Priority Areas, Hokkaido University, 2004 - 2008惑星系円盤におけるダストの衝突進化と熱進化の素過程,観測結果を読み解くうえで重要な光学に関する研究,ダスト生成とその後続解析実験,ダスト衝突実験,氷表面における分子反応等,物質進化の総合的研究を展開した.加えて,この分野の研究基盤形成にも貢献した.研究グループの交流を促進し,国内の関連研究グループの組織化を図り,研究コミュニティー形成を積極的に推進した
- 科学研究費補助金, 2004 - 2008惑星形成過程における微粒子衝突に関する実験的研究Competitive research funding
- Grant-in-Aid for Scientific Research, 2004 - 2008Experimental study on the dust collision process in the solar nebulaCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Nagoya University, 2005 - 2007Impact crater formation on comet surface and its implications for thermal history of comet nucleusWe carried out impact experiments on snow to simulate the impact crater found on the surface of comet nuclei. Especially, in order to clarify the relationship between the thermal history of the comet surface and the crater morphology, the impact experiments were conducted using sintered snow samples. The size of the impact crater was found to increase with the increase of the impact velocity up to 150m/s when the snow projectile was impacted on the snow with the porosity of 40% sintered at-10℃ during 15 min. These results show that the crater volume has a power law relationship to the projectile kinetic energy (Ek) with the power law index of 0.5 for the Ek. The crater size was found to decrease with the increase of the sintering time from 3 min. to 60 hrs. at -10℃. The crater volume has a power law relationship to the sintering time. A high velocity impact of a nylon projectile with the velocity of 2.7km was carried out on the snow with the porosity of 50%, and then we found that the outer edge of the crater was spalled out to form a ring like structure of the crater rim and the crater had a very spherical shape with the refrozen thin ice layer on the inner wall. This results show that the impact of the nylon projectile higher than 2.7km/s (impact pressure could be 3.9GPa) can induce impact melting of snow to spread it out on the crater wall. In order to estimate the temperature increase of the high velocity impact quantitatively, ice-on-ice impact experiments were conducted to measure the post shock temperature on the crater by using an infrared video camera. As a result, we found that the post shock temperature was measured to be from 2K to 9K when the ice projectile was impacted up to 300m/s. Thus, it was found that the projectile kinetic energy was partitioned into the crater heated at the post shock temperature with the partition coefficient of 1% to 10%.Competitive research funding
- Grant-in-Aid for Scientific Research, 2005 - 2007Crater formation process on the comet surface and the implication to the thermal history of the cometCompetitive research funding
- 日本学術振興会, 科学研究費助成事業, 萌芽研究, 2004 - 2006彗星の衝撃変成による含水鉱物の形成本年度は,氷・珪酸塩混合物の水熱変成に最も重要な素過程である衝撃加熱に関する実験を行なった.衝繋加熱による温度上昇は衝突物質の空隙率に大きく依存する.また,含水鉱物の形成効率を考えると衝突加熱の領域を定量的に見積もることが重要である.そこで,空隙率を50〜80%の間で変化させた雪試料を用いてクレーター形成実験を行ない,回収した試料のクレーター孔を観察して加熱領域の広さとその特徴を調べた.また,水熱反応に重要な衝突余熱の定量測定を行なうため,赤外線ビデオを用いた直接観察の手法開発も行なった. クレーター形成実験は,雪試料(空隙率50%と80%)に2〜3km/sでナイロン弾(7mg)を衝突させて行なった.回収された試料からクレーターの形態を解析したところ,80%空隙率試料では上部を削られた球の形状を示すクレーターが観測された.球の中心は,弾丸径の8倍くらい表面から試料中に潜りこんでいる.一方,50%空隙率試料のクレーターは,スポール破壊によると思われるリング状の外縁部を持ち,その中に球形を示すクレーターが観察された.球の中心は弾丸径の5倍くらい試料中に潜り込んでいる.この空隙率の試料にのみ,クレーターの底面および側面に氷が融解して再凍結してできたと思われる薄い層が確認された.このことから,衝突速度2.7km/s(衝突点圧力〜3.9GPa)以上では,空隙率50%の試料においてはクレーター形成時に十分な量の氷が衝突溶融を起こすことがわかった. 隕石母天体の始源天体である微惑星はμmサイズのダストからできていたと思われている.そこでサイズ1μmのSiO_2ガラス球のアグリゲイトを衝突試料に用いて,衝突余熱の測定を行なった.温度測定は,衝突付着時の様子を赤外線ビデオカメラで撮影して行なった.ダストアグリゲイトを40〜50m/sまでガス銃で加速し,アクリル板に衝突させたところ,衝突後1/30秒以内に3℃以上の温度上昇が測定された.本手法は衝突余熱の測定に有効であることが確認された.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Hokkaido University, 2003 - 2004UV-induced diamond formation in interstellar cloudsNew formation routes of diamond in interstellar clouds and parent bodies of carbonaceous chondrites are found based on laboratory experiments. It is shown that diamond precursor nucleated as a result of UV photolysis of interstellar ice mixtures in molecular clouds, and grew with further UV irradiation in diffuse clouds. The present study supports the occurrence of diamonds in interstellar clouds, and suggests that diamond is ubiquitous in space. Furthermore, we performed experiments on the aqueous alteration and the subsequent thermal metamorphism of organic materials formed in molecular cloud, and found that diamonds formed by this process in the parent bodies of carbonaceous chondrites. The various characteristics of nano-diamonds in chondrites and interplanetary dusts are well explained by these new formation routes.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Hokkaido University, 2002 - 2004Experimental study on ice-on-ice friction and compressive properties of high-density snowFriction coefficient of ice changes with the temperature and the relative velocity. So, we have studied the effect of friction coefficient on the snow drag force. The drag force exerted by indentation has been measured below the density of 400kg/m^3. However, the drag force generated in the high-density snow (>400kg/m^3) is now important for the snow debris of avalanche, compressed snow on the road, and icy satellites. Therefore, we made indentation tests to clarify the mechanical behavior of the high-density snow and measured the drag force generated by ice granular flow to study the relationship between the ice friction coefficient and the snow drag force. Snow drag force was measured by using cylinder set in a various depth at -10℃ for the flow speed from 0.5 to 500mm/s. Thus, we have found that the drag force decreased with increasing the flow velocity. But, the same velocity dependence was not found in the test conducted at -50℃: it was a constant. The velocity dependence of the drag force at -10℃ could be explained by the velocity dependence of the ice friction coefficient. The ice friction coefficient decreases with increasing the velocity because of the frictional melting at the boundary to reduce the friction. Compression measurements were conducted by using a rod to penetrate high-density snow. Two types of deformation were recognized plastic-type and destructive-type deformations. In the plastic-type deformation, the relation between the stress and strain rates was nonlinear, hence, this deformation is not Newtonian and is expressed by a power law. This suggests that in addition to the particle rearrangement operative in low-density snow, plastic-type deformation and destruction of ice particles are also important. The critical penetration speeds between the two deformation types were 0.33-0.83, 0.83-1.67, and 1.67-3.33 mm/ for snow densities of 550, 640, and 730 kg/m^3, respectively. The power increased with density and approached 3, which correspond to that required for penetrating ice.
- 日本学術振興会, 科学研究費助成事業, 萌芽研究, 北海道大学, 2002 - 2003彗星、エッジワース・カイパーベルト天体の力学物性と衝突破壊強度本年度は、様々な衝突条件下で氷・岩石混合物の破壊モード、破片の飛翔速度、衝撃圧の減衰率を実験的に調べた。氷・岩石混合物試料は氷と蛇紋岩粉末を質量比1:1で混合して作成した(密度1350kg/m^3)。試料の形状は直径50mmの円筒形とサイズ20mmx20mmの直方体であり、それぞれ厚さを2.4〜46mm、10〜30mmの間で変化させた。衝突実験は低温室(-10℃)に設置した二段式軽ガス銃を用いて行なった。弾丸はナイロン円柱(直径1.6mm、質量7mg)で、その衝突速度は2.9〜3.8km/sであった。衝突過程は高速度デジタルビデオカメラ(撮影速度:3000fps〜8000fps)とイメージコンバーターカメラ(2〜5x10^5fps)により観察した。(破壊モード)試料の厚みが薄い円板の場合、試料の中央部に貫通孔が作られるのみで周囲はほとんど破壊を受けない。試料が厚くなるにつれて、中央孔から放射状に伸びるクラックが発達するようになり、試料全体が破砕される。しかしながら、直径と厚さの比が1:1に近づくとクラックの成長は抑制され、試料全体の破壊は起こらずにクレーター孔だけとなる。(反対点速度)衝突の反対点における破片速度は試料が厚くなるにつれて遅くなるが、その時の速度と試料厚の関係は試料の形状に依存する。直径50mmの円板試料は、サイズ20mmの直方体試料と比較すると常に同じ試料厚で速度が遅くなっている。円板試料では側面からの反射波による破壊が起こらず、反対点付近からの反射波によるスポール破壊により破片は加速される。一方、直方体試料では側面から強い反射波が来るため反対点付近ではこの側面反射波により破砕を受け、背面からの反射波はほとんど強度を失った試料を加速することになる。この加速メカニズムの違いが上記の差を生じさせたと思われる。直方体試料の場合、試料厚(L)と反対点速度(v_a)の関係は、v_a∝L^<-3.0>となった。この減衰率3.0は氷の場合(2.2)と比べてかなり大きい。また、速度の絶対値も氷の約半分までと遅くなっている。反対点速度を自由表面速度とみなして上記の関係を衝撃圧力の減衰率に換算し直すと、圧力の減衰率は距離の-2.7となった。これは氷の-2.2と比べると有意に大きな値である。(破片質量と速度の関係)高速度カメラの撮影画像から得られた破片サイズを用いて、反対点における破片質量(m_a)と飛翔速度の関係を求めることができた。この関係は、試料の形状に関係なくv_a=7.1m_a^<-0.35>となった。これは、破片が受ける単位面積あたりの力積が衝突条件や破片サイズに関係なく一定であることを意味していると思われる。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 2001 - 2003Experimental study on the heating of silicate aggregates and the formation of chondrules by nebula shockWe have developed a new instrument to generate a strong shock wave with a large Mach number in gas. This instrument was consisted of a two-stage light gas gun and a small high-pressure vessel set in a sample chamber evacuated in a vacuum. Collisions among nebula gas and the dust-gas interaction in a generated shock wave were simulated with this instrument. A nylon projectile with the size of 1.6mm was launched into the high-pressure vessel filled with 1 bar air and this projectile generates a strong shock wave after it penetrates into the air. We have observed a bow shock with the Mach number larger than 9 around the projectile by using a high-speed photography, but we didn't observe any emission from the shock compressed gas and the surface of the projectile heated by gas drag. The projectile was observed to be intact without any disruption and melting after the penetration into the gas. We have also studied a disruption experiment of a water droplet by high velocity gas flow. This study simulates a completely molten silicate droplets caused by nebula shock, which are compressed or sheared by gas drag. The disrupted silicate melts could be related to the origin of chondrules based on the evidence such as the size distribution and the characteristics of the shape. We have conducted this experiment with a water droplet whose size is 0.3 to 5mm at the condition with the Mach number from 1.01-1.12 by using a shock tube in air. The disruption was observed by a high-speed digital video and the size distribution of the disrupted droplets was analyzed. Our result shows that the disrupted droplets have an exponential relationship for the cumulative mass distribution and the slope of this exponential relation is found to depend on a Weber number (4-400)
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 2001 - 2003Development of electrostatic accelerator for ice dust and the aggregatesWe have developed an electrostatic accelerator to launch a ice dust and ice aggregates at a wide range of velocities from cm/s to km/s. The ice sample launched was prepared by a condensation, method : a cold copper plate cooled by liquid nitrogen was subjected to an air saturated with water vapor at -10℃. The condensed icy dust is an almost spherical shape with the size of 10 μm, Ice aggregates were grown by collecting each ice dust under high electric field more than 100 V/cm. The aggregate was charged under the electric field, so that it was launched by the electrostatic attraction. The relationship between the electric field and the velocity is derived as follows for the aggregates of 500μm.: V_i=0.25(V_
/d)^<0.9> (m/s), V_i: velocity, V_o: Voltage, d: distance between electrodes (d=2.5mm). The launch velocity is strongly affected by the air drag for the small aggregates, so we have set a vacuum chamber to eliminate the gas drag to the aggregates in the acceleration. We also used a longer acceleration tube to avoid disruption of the aggregates by the strong attraction force. As a result we have achieved 20m/s for 500μm aggregate at the electric field of 1kV/mm and 1 bar. In the evacuated condition of 0.1 bar, the launched velocity increased about 3 to 4 times higher than that of 1 bar at the same electric field strength. This means that it could be possible to achieve more than 100 m/s for ice aggregate of 500 μm at 1kV/mm. - Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 2000 - 2001Collisional sticking of organic grains in the solar nebulaHeating and collision experiments were performed involving interstellar organic material analogue to determine the distribution of interstellar organic material in the proto solar nebula and to investigate the growth of organic grains. We found that there were interstellar organic grains in 2.1-3.0 AU, silicate grains <2.1 AU, and ice grains>3.0 AU. We also found that gas evaporated at around 2.2 AU is very reductive. The organic material in 2.1-3.0 AU is very sticky ; the sticking threshold velocity of the mm-size organic grains is 5 m/s. This shows a very rapid coagulation of organic grain aggregates, the formation of planetesimals even the early stage of the turbulent accretion disk. The planetesimals in this region become achondrites' parent bodies. In contrast, the formation of planetesimals in <2.1 AU and >3.0 AU occur when passive disk is formed, because silicate and ice grains are not sticky. The planetesimals in <2.1 AU and >3.0 AU become ordinary and carbonaceous chondrites' parent bodies, respectively. In these framework, we discuss a redox state of chondrites, an oxygen isotope composition of meteorites and planets, and the formation of chondrules. We have succeded to give an explanation for various sequences among meteorites and planets by the heliocentric distance only : the sequence from the sun is the Earth, Mars, LL, L, H, E, Aubrite, HED, Acapulcoite, Ureilite, CO, CV, CM, CI.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Hokkaido University, 1998 - 2001Impact and friction mechanisms and structural changes of snow and ice in snow avalanches, ice blasts and icy planetecimal impactsIce-ice friction measurements were extended to the lowest sliding velocities aimed originally in the project. For the experiment a new device of non-rotation type was constructed and installed in a cold room, which enabled us to carry out the friction experiment to the velocities of 10^<-7> to 10^<-3> m/s and normal stresses of 123 to 368 kPa. The obtained results below 10^<-4> m/s was different f rom what has been expected from the traditional adhesion shear mechanism. Based on the experiment al result a new model of adhesion shear mechanism was proposed taking account of junction growth d ue to sintering of ice asperities on the sliding surfaces. High speed impact experiments were conducted in relation to the formation mechanism of characteristic craters found on regolith layers on asteroids, Mars, and other icy bodies. Samples used are mixtures of H_2O ice, CO_2 ice and rocks, and projectiles, made of H_2O ice, metal or plastic, were impacted with a speed of 100 to 600 m/s. The project was conducted with cooperation of Prof. Leliwa-Kopystysnski of Warsaw University. Effects of electric field on ice friction were investigated.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, 1999 - 2000The observation of the growth and ifrured absorption for dust particles ecclosed in a small scale spaceThe purpose of this study is to clarify the growth process of cosmic dusts in the interstellar space and to determine the optical property of the cosmic dusts in the laboratory. Our final goal of this experiment is that we observe the growth process of the dust particles in collision with time when various kinds of small dusts are enclosed in a small vacuum space for a long time. The chosen materials are ices, organic matters and silicates, and their sizes are from 0.1 to 1 mm. We also intend to analyze these dusts by using a infrared absorption method. In this term, we have finished to develop the instrument to enclose the dust particles, which is the most important part of this experiment, moreover we estimated the adhesion strength among the organic dust particles. We succeeded to enclose molecular ions for several hours by means of the developed instrument of dust enclosure, so called RF ion trap instrument in ultra-high vacuum chamber. This instrument has characteristics that there are 4 holes of the diameter of 5mm at the ion trap electrode necessary to observe the interior and that the electric gun is set as a lower electrode. We did a preliminary test with molecular ions, then we developed the impedance matching instrument for high frequency electric field in order to arrange the experimental conditions to enclose the dust particles. We improved our electrodes for the ion trap according to these preliminary tests. Before we try to enclose the organic dusts, we studied the adhesion force of ethylene glycol particles, which particles were formed by a spray, at 200 K.The adhesion force was measured by a flowing method. As a result, the adhesion force of the organic matter was concluded to be several orders of magnitudes larger than that of silicate particles.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Institute of Low Temperature Science, HOKKAIDO UNIVERSITY, 1998 - 1999Development of comet nucleus simulation experimentsWe have developed new methods for making amorphous icy grains: 1 ) CO sublimation-induced disruption method First, we deposited CO sample of 10 mm thickness. Second, thin film of amorphous water ice was deposited on the CO. After deposition, the substrate was heated by turning off the helium refrigerator. At temperatures around 30 K, corresponding to CO sublimation temperatures, the sublimation of CO occurred violently, and this caused the disruption of the thin film of amorphous water ice. 2) Continuous production method by fast codeposition of HィイD22ィエD2O and COィイD22ィエD2. We found that continuous disruption of ice film occurred during the deposition , when deposition rate is larger than 3x10ィイD1-9ィエD1 m/s and when thickness of the film is larger than critical thickness. In both method, we collected amorphous icy grains falling from the substrate using grain collector. These methods enables us to perform better comet nucleus simulation experiments than hitherto performed.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), HOKKAIDO UNIVERSITY, 1997 - 1999Structure and physical properties of impure amorphous interstellar icy grainsThe following research was carried out on the formation and metamorphism of amorphous icy grains and origin and evolution of comets using newly developed ultrahigh-vacuum very low temperature atomic force microscope and existing equipments : 1) By irradiating the ultraviolet rays onto amorphous ice thin film, we analyze the formation of hydrogen molecule quantitatively. In addition, the reaction cross section was measured, and the reaction mechanism was decided. 2) The measurements on physical properties of impure amorphous ices were carried out. The thermal conductivity of impure amorphous ice was found to be 2-3 orders of magnitude smaller than that of the amorphous ice without the defect. As a result of the differential thermal analysis, we found that the crystallization of amorphous ices including impurities were endothermic reaction. 3) There results clearly shows that the some properties of impure amorphous ices strongly depends on their defect structure in amorphous ices. 4) On the basis of the above results, we have calculated the thermal history of comet nucleus. We found that runaway crystallization considered until now could not be occurred in the actual comet nucleus.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 1996 - 1998In-situ measurement of high velocoty impact fragments of icy planetsHigh velocity impact among icy planets is an important physical phenomenon related to the planetary accretion process in the outer solar system. Then, an impact experiment on water ice was made by using a micro two-stage light gas gun installed in a cold room (-10゚C) to clarify elementary processes of the collisional disruption and to study reaccumulation condition of the impact fragments. As a result, we clarified that the shock pressure attenuated in the ice target according to the relation of P = a (Lp/d)^2 irrespective of the mass ratio between 10^-3 to 10^-5, where Lp is a projectile size and d is a propagation distance. We also observed that the shock wave propagated with the velocity of 4.4 km/s at the shock pressure from 10 to 200 GPa ; 2.6 km/s at 200 MPa. Below 200 MPa, the shear fracture region expanded with the velocity of 1.7 km/s until the shock pressure decreased lower than 60 MPa. The reaccumulation condition of icy planets in the high velocity collisions was estimated to show that fragments disrupted from parent bodies with the radius larger than 500 km could reaccumulate at any conditions of the impact velocity from 500 m/s to 5 km/s and the mass ratio from 10^-2 to l0^-5.
- 日本学術振興会, 科学研究費助成事業, 萌芽的研究, 北海道大学, 1996 - 1997星雲ガスの集積に伴う星間塵の熱変成作用原始太陽系の星雲ガスとダストとの相互作用を調べるために,衝撃波管を用いた流体力学的実験を行った.昨年度は衝撃波管を設計・製作し,その装置を用いて多孔質ダストの抵抗計数やその変形について詳しく調べた.本年度は低温下での揮発性物質の摩擦加熱・蒸発を調べるため衝撃波管の改良を行い,実験を実施した。 揮発性物質の試料にはドライアイスの薄膜(>1μm)を用いた.その薄膜は,液体窒素により冷却したクライオスタット(温度-150〜-170℃)上のアルミ板に作成した.この薄膜に高速の気流(アルゴンガス)を衝突させ,蒸発量を求めた.衝突気流の速度は900〜1000m/sであり,その圧力は6000Paであった.蒸発したドライアイス量の測定は波長2.7μmでの赤外発光強度を観測することにより行った.検出器はPbSe(立ち上がり50μs以下)であり,半値幅0.1μmのバンドパスフィルターを用いて分光を行った. ドライアイスの薄膜は高速気流がぶつかるとその表面で摩擦熱が発生し,その熱により蒸発が起こると思われる.確かに実験の結果ドライアイスの蒸発によると思われる赤外発光を観測することができた.そしてこの観測された赤外発光強度から薄膜表面での気流衝突による上昇温度を見積もると8K以下となった.この表面温度の上昇はアルミ板衝突によるアルゴンガスの温度上昇(4000K)と較べると遙かに小さいことがわかる.ドライアイスを蒸発させる熱源としては,摩擦熱・衝突ガスからの熱伝達(輻射・伝導・対流)があるが,それらの熱はドライアイスの潜熱として消費され,ほとんどその表面温度を上げないことを示している. 二年間の研究により星間塵と星雲ガスの相互作用を調べるための装置開発と実験技術との蓄積を行うことができた.またこの衝撃波管を用いた実験における技術的課題や可能性も明らかになった.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 1995 - 1997Study of snow avalanches, ice-blast and collision of icy planetary bodies by high-speed impact and shock-wave experiments of iceDetailed processes of ice impact and its relation to shock waves have not been clarified mainly because of various experimental difficulties. However the processess are the most important to understand the mechanism of natural high-speed snow avalanches, practical ice blast techniques, and various planetary collisions of icy bodies. This study was aimed at obtaining the fundamental and common information related to the above-mentioned phenomena by making three different experiments of ice. High-Speed impact experiments were made in a large cold room maintained at -15 degree C.A light gas gun was used to impact ice projentile on ice or snow plates. The impact speed was from 50 to 700 m/s. The experiments at lower speeds were made by dropping ice or snow blocks from a 15-m high tower. Shock tubes were also used to observe the interaction between a shock wave and fine ice particles. In all the three experiments the behavior of ice and snow was observed by high-speed video and image-converter cameras using Schlieren and shadow photography. The analyzes of the obtained datagave many important results such as crack development, ice ejection velocities, etc., the physical implications of which were discussed in each natural and planetary phenomenon.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), HOKKAIDO UNIVERSITY, 1995 - 1997Development of Chemical Evolution Simular in Interstellar SpacePrimordial solid particles in the dark nebula consist of minuscule silicate minerals mantled by organic materials, and in turn by cosmochemical ice. When they are exposed to UV,cosmic rays, or some high energy sources such as collision and radiation, their physical and chemical properties are altered accordingly through thermal metamorphism, evaporation, and chemical and isotopic fractionations. The new molecules generated in those events become constituents of the next generation in interstellar space. In our own solar nebula, in ancient times, interstellar dust were altered and recycled in much the same way, collided each other, and coaggulated to primary bodies of miniature planets. Carbonaceous meteorites are debris of such celestial bodies. We have developed a new laboratory system that is capable of monitoring time-dependent evolution of molecules generated from primordial interstellar particles as they are exposed to controlled fluxes of various energy sources. With this new device, we are able to investigate the physical environment of the primordial solar nebula, and hopefully decipher the origin of the solar system materials. The new device, "the cosmochemical evolution simulator" is equipped with three turbomolecular pumps, a main vacuum Chamber, and a diffentia11y-evacuated sub-chamber. The high vacuum system produces 10^<-10> Torr with no load, and better than 10^<-7> Torr during high-temperature heatings. The main vacuum chamber is equipped with a high-T tungsten heater, UV lamp, or IR lamp to provide high/low temperatures or high/low energies, with which primordial materials such as carbonaceous fine particles are heated, altered, and evaporated. The sub-chamber is used for mass spectrometric analyzes and photometry either with a quadrupole mass spectrometer or IR spectrophotometry attached to it. A criostat chamber in place of the sub-chamber attached to the main chamber provides a cold substrate for extreme low temperatures. Indigenous molecules generated from the primordial solid particles are condensed to reproduce interstellar ice and organic compounds. From these results, our primary goal, viz.development of chemical evolution simulator in interstellar space, is now complete.
- 日本学術振興会, 科学研究費助成事業, 奨励研究(A), 北海道大学, 1995 - 1995惑星衝突による衝撃波と破壊の発生・伝播に関する実験的研究惑星の衝突破壊は,太陽系天体の成長・進化過程を研究する上で最も重要な物理過程の一つである。そこでこの衝突破壊過程の物理を理解するために,関連する素過程とその素過程どうしの相互作用を明らかにする実験的研究を行った.特に,太陽系外惑星領域での主要構成鉱物である氷を用いた衝突破壊実験を通して,氷天体の衝突破壊の物理を明らかにした.衝突破壊の素過程である,衝撃波の伝播及びクラックの発生・成長を観察するために,超高速度カメラによる氷内部の可視化撮影を行った.その結果,衝突速度〜10m/sでは,縦割れクラックが卓越し,その成長速度は,最高で1050±130m/sであることがわかった.一方,氷一氷高速度衝突においては,衝突速度の変化に伴う破壊の伝播速度の変化が発見された.回収した試料には衝突点近傍では,圧縮剪断破壊により発生した細粒のドメイン構造が観察され、遠くに行くと引っ張り応力により発生した縦割れクラックが卓越して観察された.クラックの成長速度もこの破壊形態に依存して変化している。衝突点近傍の圧縮剪断破壊領域では,2〜3.5km/sという氷の縦波速度に近い高速度で破壊が伝播し,衝突点から遠い縦割れ領域では,1km/s以下に減衰する.この結果は,衝突点近傍での破壊は,衝撃波に先立つ先行弾性波に起因することを意味している.先行弾性波は,ユゴニオ弾性限界を越える高圧力になると圧縮剪断破壊を伴い,氷中を減衰しながら伝播していくと思われる.一方,縦割れクラックは,衝突後充分に時間が経ち,弾・塑性波の反射により試料全体が変形を起こし,引っ張りの応力場が実現した後に発生・伝播して行くと思われる.本研究では,衝撃波を観測することはできなかったが,これは破壊の進行の方が衝撃波に先立つためであると思われる.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Co-operative Research (A), The University of Tokyo, 1993 - 1994Co-operative study of comparative planetary geology using digital image informationIn the study of planetary geology, digital data of surface images of planets and satellites are the important clue and image processing systems are necessary instruments. In our project, adding data reader/recorder instruments and using appropriate softwares, we can utilize pre-existing personal computers and workstations for the image processing of digital data. As a center of data control and our network, we introduced a database machine at Nagoya Univ. (now at Toho Junior College). This machine is now used not only by our group but also by larger planetary science community in Japan. In our group, volcanic activity history of Mars, landslides on Venus, lava flows on Venus, tectonics on Venus, development of image processing method using genetic algorithm, image processing of asteroids, shape of small bodies and impacts, application of ocean data base, size distribution of craters on icy satellites, Venus-Earth CD-ROM were done by the member of this co-operative study. On 94-10-05, "Planetary Geology" workshop was held at Nagoya University. We had about 25 attendants. On 95-01-17, the summary workshop of the present co-operative study was held at the University of Tokyo.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (B), Hokkaido University, 1993 - 1994Investigations of high-speed avalanche dynamics and Hugoniot of ice by the high-speed impact experiments of snowHigh-speed impact experiments of snow and ice were conducted in a large cold room maintained at -18゚C.A light gas gun was used to impact an ice projectile (15 mm cylinder with a round cap of radius 8 mm) on snow and ice plates. The impact speed was varied between 50 and 600 m/s. Observations of crack growth in the ice target was possible by eliminating reflections from walls. The impact phenomena were photographed with an image-converter camera at 200,000 and 500,000 frames per second. The lighting system used was Schlieren and shadow photograpy. From the photographic observations, the following results were obtained. In the impact experiment between an ice projectile and ice plate, cracks developed semicircularly, and the propagation velocity of craks amounted to roughly 3 km/s when the impact speed was 139 m/s. The propagation velocity varies between 2.1 and 4.0 km/s at the impact speed of 139-528 m/s. In the high-speed impact experiments between an ice projectile and snow paltes (thickness of 3,5,10,20,30 mm and porosity of 15 and 30%), it was found that the free surface particle velocity decreased with distance and that of snow was larger than that of ice at the same impact velocity.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (C), (Institute of Low Temperature Science), Hokkaido University, 1992 - 1993Experimental Study on the deformation properties of cosmic ices.The steady-state deformation of partially melted ice in the ammonia-water system was studied by means of a concentric cylinder viscometer in shear stresses, 10 kPa-0.1 MPa, temperatures, 180-210K and NH_3 contents, 4.0-8.4%. The flow law found was of a non-Newtonian power-law type ; the power index was 4.0(〕SY.+-.〔)0.1. The activation energy at constant melt fractions was 33.7(〕SY.+-.〔)0.8kJ/mol, which was close to that of viscosity for aqueous ammonia solutions. The calculated effective viscosity of partially melted ice at 0.1 MPa was 10^7-10^<10> Pa s, which is by ten orders of maguitudes smaller than that of the ammonia-water mixture in a solid phase below a peritectic point, 176 K.
- 日本学術振興会, 科学研究費助成事業, 重点領域研究, 北海道大学, 1991 - 1991大規模山地豪雪雪崩のメカニズムと予測に関する基礎研究一般に湿雪雪崩の形は単純でその動的特徴の多くは斜面を流下する濡れた雪塊として理解できる。しかし、乾雪雪崩、特に煙り型乾雪表層雪崩は、昭和61年13人の死者を出した新潟県能生町の柵口雪崩にように、極めて高速かつ大規模になり、大きな被害を起こしやすいにもかかわらず、その内部構造と動的特性について詳しい情報が得られておらず、その予測や防御が難しい。本研究では実際の乾雪表層雪崩の内部構造を調べるために、黒部峡谷志合谷において観測を実施した。これは雪崩走路上に設置されている2基のマウンドに雪崩観測用のカメラ、衝撃圧センサ-、超音波風速計等を取り付け、雪崩の自然発生を待つ方法である。黒部峡谷志合谷で観測された数個の雪崩では、雪崩風が観測された。雪崩風は雪崩の実体の前面あるいは側方に発生する局部的な強風であり、その存在やそれによる災害がしばしば報告されいるが、これまで定量的に観測はなかった。今回観測された雪崩風は、雪崩自身の規模があまり大きくなかったが、雪崩の実質部よりもはっきりと先行しており、その速度は雪崩前面の速度にほぼ等しかった。 本研究では、また雪崩の内部構造と運動メカニズムを調べるために、大型低温実験室における氷球を用いたシュ-ト実験が実施された。多数の氷球(平均粒径2.9mm)がシュ-ト(長さ5.4m、幅8cm)を流下する様子が高速ビデオで撮影され、速度と密度が求められた。シュ-トの角度は30度から40度、実験温度は0℃からー30℃の範囲で変えられた。得られた氷粒子速度と密度の鉛直分布からは、流れの最下部に低密度層が見出され、この層が生成する理由は粒子間衝突の結果と結論された。
- 日本学術振興会, 科学研究費助成事業, 奨励研究(A), 北海道大学, 1991 - 1991氷,アンモニア・メタン水知物のレオロジーと氷衛星のテクトニクス