Curriculum Vitaes
Profile Information
- Affiliation
- Senior Researcher, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Degree
- 博士（理学）(東京大学)
- ORCID ID
https://orcid.org/0000-0001-6366-2608- J-GLOBAL ID
- 200901078920834652
- researchmap Member ID
- 5000019324
Research Areas
2Research History
7-
Apr, 2016 - Sep, 2024
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Oct, 2015 - Mar, 2016
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Apr, 2005 - Sep, 2015
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Apr, 2004 - Mar, 2005
Education
3-
Apr, 1996 - Mar, 1999
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Apr, 1993 - Mar, 1995
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Apr, 1989 - Mar, 1993
Committee Memberships
2-
Apr, 2015 - Present
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Apr, 2009 - Mar, 2015
Awards
2Papers
288-
The Planetary Science Journal, Dec 1, 2025
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Discover Life, 55(1), Sep, 2025In space, asteroids have collided with planets and satellites throughout their long history, and many types of organic molecules have been synthesized. In particular, on satellites with gas atmospheres such as titan, a satellite of saturn, asteroid impacts cause hot reactions in a hot gas plume. To investigate the effects of asteroid impacts, simulation experiment has been carried out using a two-stage light-gas gun in nitrogen gas. we used a small polycarbonate bullet to impact on an iron-based target in nitrogen gas at a pressure of 100 kpa and a speed of approximately 7 km/s. As a result, many carbonaceous nanoparticles were produced. By analyzing the produced soot, using a water extraction method, a dabsylation method and a liquid chromatography method, we detected markedly large amounts of amino acids (glycine and alanine). The reaction process in the hot gas plume was considered. Many types of radicals collide with each other in nitrogen gas and the impact provides a suitable environment for the synthesis of amino acids and precursors of amino acids....
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International Journal of Impact Engineering, Aug, 2025
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Journal of Spacecraft and Rockets, (in press), Jul, 2025 Peer-reviewed
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Journal of Space Safety Engineering, Jun, 2025
Misc.
635-
Abstracts for fall meeting of the Japanese Society for Planetary Science, 2006 104-104, 2006Silica aerogel has been used as a suitable capture medium for solid microparticles with hypervelocity. The authors have been conducting experiments for evaluation of thermal alteration of particles captured by silica aerogel and energy partition. In this study, formation of penetration tracks in aerogel was observed and recorded by a high-speed camera. Excavation process of a single track, so-called a "carrot track" made by a 500 micron-Al2O3 grain was observed. At first a thin track grew in the direction of penetration and then it started to swell into a "carrot". Assuming that brighter part represents higher temperature/pressure area, shock wave dissipation in aerogel can be recognized. Combining this and our previous results, this study aims at finding empirical facts constraining energy partition.
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2006 79-79, 2006As a post-Hayabusa mission in 2010's, our working group has been developing a new sampling system for C-type and other primitive asteroid surface and sub-surface materials, based upon technology and operation established and lessons learned by Hayabusa's touch-and-go sampling attempt at the S-type asteroid Itokawa in 2005. Both impact sampling with corer projectiles and a microgravity tether retraction system are under the development as well as shaped charge excavation on free asteroidal surface. This study summarizes results of those endeavors and future prospects of this challenge.
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宇宙科学技術連合講演会講演集(CD-ROM), 50th 2H14, 2006
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2006 26-26, 2006Impact cratering experiments in microgravity environment were performed using a drop tower. The results showed no gravity effect. Details of experimental procedures and results will be presented at the session.
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宇宙科学技術連合講演会講演集(CD-ROM), 49th, 2005
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宇宙科学技術連合講演会講演集(CD-ROM), 49th, 2005
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宇宙科学技術連合講演会講演集(CD-ROM), 49th, 2005
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IEEE Nuclear Science Symposium Conference Record, 1 423-427, 2005
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2005 24-24, 2005We performed N (10 micron) and Q-band (20 micron) observations of 25143 Itokawa at the ESO La Silla 3.6m telescope with TIMMI2. At last apparition in 2001, Sekiguchi et al. (2003) derived its size and geometric albedo from STM analysis. Our new data in July 2004, in combination with already published data, allowed us to de-termine a radiometric effective diameter of 0.32+/-0.03km and an albedo of 0.19 +0.11/-0.03 through a Thermophysical Model. This effective diameter corresponds to 520 (+/-50) x 270 (+/-30) x 230 (+/-20) m based on the Kaasalainen et al.(2005) shape model with a lightcurve analysis using optical observations data. These re-sults are incompatible with them derived from radar observations in 15 % differ-ences. The obtained thermal inertia indicates a bare rock surface. The total mass of Itokawa was derived to be 4.5x10^10 kg from our results assuming the bulk density for S-type asteroids.
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2005 38-38, 2005We present the results of photometric observations of the near-Earth asteroid 65803 Didymos (1996 GT) in 2003 and 2005. Didymos has a complex lightcurve consisting of mainly two independent components. It suggests that the two-body system as asynchronous binary displaying the mutual eclipse/occultation by the satellite. Although the taxonomic type was revealed an M-type from the reflectance spectrum and phase curve, the bulk density is estimated at 1.4 +/- 0.3 g/cm<SUP>3</SUP> by the analysis of the satellite orbit. This could indicate that Didymos is composed of, not metallic but, chondritic materials.
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METEORITICS & PLANETARY SCIENCE, 39(8) A116-A116, Aug, 2004
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日本惑星科学会秋季講演会予稿集, 2003 39-28, Oct 8, 2003衝突クレーター形成過程において、サイズ等を支配するパラメーターが、標的が岩石等の場合は物質強度、標的がレゴリス等の場合は表面重力であることは様々な研究により明らかにされている。しかし、標的がレゴリスでかつ表面重力が微小な場合に、どのようなパラメターにより支配されるかは明らかでない。このような領域でのクレーター形成過程を定量的に明らかにすることは、小惑星の表面進化過程を研究するうえで重要である。今回我々は、落下カプセルを用いた微小重力環境下でのクレーター形成実験を行ったので、その結果を発表する。
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宇宙科学技術連合講演会講演集(CD-ROM), 47th, 2003
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Meeting Abstracts of the Physical Society of Japan, 58 120-120, 2003
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第12回東京大学原子力研究総合センターシンポジウム 平成15年, 2003
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宇宙科学シンポジウム 平成14年度 第3回, 3 341-344, 2003
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2003 87-87, 2003Asteroid 4 Vesta is a peculiar asteroid due to its basaltic composition. Many multi-band observations for Vesta were carried out and at last the image of Vesta were obtained by Hubble Space Telescope in 1994, and a geologic map was made.2003. <BR> We made the visual observation using a transportable 10 cm refracting telescope with a MUTOH CV-16 CCD in ECAS filter system. Infrared observations were carried out using 105cm Schmidt telescope with Mitsubishi 1040 x 1040 PtSi CSD (KONIC) in H band at Kiso Observatory. And we made spectroscopic observation (500nm to 900nm) using a 65 cm reflecting telescope and GCS (Gunma Compact Spectrograph) at Gunma Astronomical Observatory.<BR>We report consideration of the effect of space weathering as well as the inhomogeneous distribution of minerals on the surface of Vesta.<BR>
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2003 88-88, 2003We have succeeded in detecting a dust trail along the orbit of the short-period comet 81P/Wild2 , the target of the Stardust mission, which will fly by 81P/Wild2 in 2004 January. Based on our observation, it is likely that the trail is composed of dust particles with a diameter of about 1mm. During the flyby phase of the Stardust spacecraft, the spacecraft will come across the impacts of such large dust particles along the comet's orbit. In this study , we examine the impact fluence and impact velocity of the dust particles onto the Stardust spacecraft.
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宇宙科学シンポジウム 平成14年度 第3回, 109-112, 2003
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2002 24-24, 2002
Major Presentations
132Professional Memberships
3Research Projects
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科学研究費助成事業, 日本学術振興会, Apr, 2024 - Mar, 2028
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2026
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科学研究費助成事業 基盤研究(B), 日本学術振興会, Apr, 2021 - Mar, 2024
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科学研究費助成事業 基盤研究(B), 日本学術振興会, Apr, 2021 - Mar, 2024
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2020 - Mar, 2023
