Curriculum Vitaes
Profile Information
- Affiliation
- associate professor, Institute of Space and Astronautical Science, Department of Solar System Science, Japan Aerospace Exploration AgencySchool of Physical Sciences Department of Space and Astronautical Science, The Graduate University for Advanced Studies
- Degree
- 理学博士(Feb, 1989, Nagoya University)
- Researcher number
- 20201949
- ORCID ID
https://orcid.org/0000-0002-4613-7956- J-GLOBAL ID
- 202001003492525290
- researchmap Member ID
- R000013755
（併任）
はやぶさ２プロジェクトチーム
国際宇宙探査センター火星衛星探査機プロジェクトチーム
（兼務）
関西学院大学大学院理工学研究科 客員教授
Research Areas
2Papers
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Physical Review E, 109(3), Mar 15, 2024 Peer-reviewedLast author
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Communications Earth & Environment, 4(1), Sep 27, 2023Abstract Returned samples from Cb-type asteroid (162173) Ryugu exhibit very dark spectra in visible and near-infrared ranges, generally consistent with the Hayabusa2 observations. A critical difference is that a structural water absorption of hydrous silicates is around twice as deep in the returned samples compared with those of Ryugu’s surface, suggesting Ryugu surface is more dehydrated. Here we use laboratory experiments data to indicate the spectral differences between returned samples and asteroid surface are best explained if Ryugu surface has (1) higher porosity, (2) larger particle size, and (3) more space-weathered condition, with the last being the most effective. On Ryugu, space weathering by micrometeoroid bombardments promoting dehydration seem to be more effective than that by solar-wind implantation. Extremely homogeneous spectra of the Ryugu’s global surface is in contrast with the heterogeneous S-type asteroid (25143) Itokawa’s spectra, which suggests space weathering has proceeded more rapidly on Cb-type asteroids than S-type asteroids.
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Journal of Astronomical Telescopes, Instruments, and Systems, 9(03), Sep 12, 2023 Peer-reviewed
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Earth, Planets and Space, 75(1), Aug 22, 2023 Peer-reviewedAbstract Zodiacal light (ZL) is sunlight scattered by interplanetary dust particles (IDPs) at optical wavelengths. The spatial distribution of IDPs in the Solar System may hold an important key to understanding the evolution of the Solar System and material transportation within it. The number density of IDPs can be expressed as $$n(r) \sim r^{-\alpha }$$, and the exponent $$\alpha \sim 1.3$$ was obtained by previous observations from interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of $$\alpha $$ based on ZL observations from interplanetary space outside Earth’s orbit have been performed since then. Here, we introduce initial results for the radial profile of the ZL at optical wavelengths observed over the range 0.76$$-$$1.06 au by ONC-T aboard the Hayabusa2# mission in 2021-2022. The ZL brightness we obtained is well reproduced by a model brightness, although there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The radial power-law index we obtained is $$\alpha = 1.30 \pm 0.08$$, which is consistent with previous results based on ZL observations. The dominant source of uncertainty arises from the uncertainty in estimating the diffuse Galactic light (DGL). Graphical Abstract
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Science, 379(6634), Feb 24, 2023 Peer-reviewedSamples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed 17 Ryugu samples measuring 1 to 8 millimeters. Carbon dioxide–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 calcium- and aluminum-rich inclusions. The samples are rich in phyllosilicates and carbonates, which formed through aqueous alteration reactions at low temperature, high pH, and water/rock ratios of <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 that Ryugu’s parent body formed ~2 million years after the beginning of Solar System formation.
Misc.
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宇宙科学技術連合講演会講演集(CD-ROM), 67th, 2023
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日本惑星科学会秋季講演会予稿集(Web), 2023, 2023
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宇宙科学技術連合講演会講演集(CD-ROM), 67th, 2023
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日本惑星科学会秋季講演会予稿集(Web), 2023, 2023
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日本地球惑星科学連合大会予稿集(Web), 2022, 2022
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Optronics : 光技術コーディネートジャーナル, 38(8) 90-94, Aug, 2019
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第30回大気圏シンポジウム: 講演集録 = Proceedings of the 30th Atmospheric Science Symposium, Dec, 2016第30回大気圏シンポジウム（2016年12月5日-6日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県 30th Atmospheric Science Symposium (December 5-6, 2016. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 12名ほか 資料番号: SA6000062035 レポート番号: VII-1
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宇宙科学技術連合講演会講演集, 60 6p, Sep, 2016
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METEORITICS & PLANETARY SCIENCE, 50, Aug, 2015
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第48回月・惑星シンポジウム = Proceedings of the 48th ISAS Lunar and Planetary Symposium, Jul, 2015第48回月・惑星シンポジウム (2015年7月29-31日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県 48th ISAS Lunar and Planetary Symposium (July 29-31, 2015. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 14名ほか 資料番号: SA6000045020
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Abstracts of Annual Meeting of the Geochemical Society of Japan, 62 227-227, 2015木星のラグランジュ点付近に存在するトロヤ群小惑星の起源は、よくわかっていない。我々は（１）種々の氷・含水鉱物・有機物が特徴的な吸収を持つ赤外域（とくに2500$\sim$5000 nmの波長域）でトロヤ群小惑星のイメージング分光を行う母機（２）小惑星表面に降り立ち揮発性の高い炭素・水素・窒素・酸素などの同位体比をその場測定する子機、から成るソーラー電力セイル探査機の検討をすすめている。2020年代に打ち上げるために進行中の、ミッション設計・探査候補天体のサーベイ・搭載機器開発について報告する。
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Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 2014 "O14-02", Sep 10, 2014
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TG-SMM 2013 - IAG Symposium on Terrestrial Gravimetry: Static and Mobile Measurements, Proceedings, 198-203, Jan 1, 2013We are developing a small telescope for observations of the Lunar rotation with a target accuracy of 1 milli-second of arc, and it has a potential to observe deflection of the vertical on the ground with high accuracy. As the results of laboratory experiments, it is possible that the vibration of the mercury surface caused by the ground vibrations lead to fluctuations of star positions on CCD as large as 0.1 seconds of arc. The amplitude of the fluctuations depend on the amplitude and the frequency of the ground vibrations and the depth of the mercury pool. The vessel for mercury made by copper with the diameter of 84mm and the depth of 0.5mm is the best judging from our experience. It is important to keep the proper period of the mercury pool away from the period of ground vibrations in order to avoid the resonance. It is also effective to lengthen the integration time not only for the effect of ground vibrations but for the effects of atmospheric fluctuations, and it can improve the reliability of the mean value of the center of a star image by statistical procedure. We investigate the cause of fluctuations which can affect the observations on the ground, and we explore the possibility for a new effective observations with the telescope like PZT.
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METEORITICS & PLANETARY SCIENCE, 47 A234-A234, Jul, 2012
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J. God. Soc. Jpn., 57(1) 15-33, Apr 25, 2011Japanese lunar explorer SELENE (KAGUYA) was equipped with 14 instruments for various measurements of the Moon. Three of these instruments took geodetic measurements of the Moon. These were two sub-satellites and a laser altimeter. They achieved all the missions expected before launch and obtained excellent results. The main results obtained by the instruments are 1) precise orbit determination with an accuracy of ten meters by Doppler and same-beam VLBI, 2) the first precise gravity fields on the lunar far side by 4-way Doppler measurements, 3) the first topography in latitudes higher than 86 degrees, 4) a global map of the gravity anomaly by using the global topography and the global gravity fields, 5) a global map of the lunar crustal thickness and 6) an illumination rate map in the north and south polar regions. These results open the new stage of lunar geodesy now.
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日本鉱物科学会年会講演要旨集, 2009, Apr 7, 2010
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Geophysical Research Letters, 36, Oct 1, 2009[1] Based on the latest SELENE lunar gravity and topography model obtained by Kaguya mission, we compute the lunar crustal thickness map to investigate differences between farside basin structures. The thickest crust is located in the southern rim of the Dirichlet-Jackson basin and the thinnest crust at the Moscoviense basin. The thickest crust corresponds to the highest topography and is consistent with Airy isostasy. The thinnest crust is due to an abnormally large mantle plug. The crustal thicknesses at Apollo 12/14 sites of our crustal thickness model are 45.1 and 49.9 km. The crustal thickness map indicates that the differences between recently proposed type I and type II basins are probably controlled by the ratio between pre-impact crustal thickness and impact scale. Copyright 2009 by the American Geophysical Union.
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Journal of the Geodetic Society of Japan, 55(2) 203-222, 2009The Japanese lunar explorer SELENE (KAGUYA), which has been launched on Sep. 14th, 2007, utilizes VLBI observations in lunar gravimetry investigations. This can particularly improve the accuracy of the low degree gravitational harmonics. Combination of ground based VLBI observations and Doppler measurements of the spacecrafts enable three dimensional orbit determinations and it can improve the knowledge of the gravity field near the limb. Differential VLBI Radio sources called VRAD experiment involves two on-board sub-satellites, Rstar (Okina) and Vstar (Ouna). These will be observed using differential VLBI to measure the trajectories of the satellites with the Japanese network named VERA (VLBI Exploration of Radio Astrometry) and an international VLBI network.<BR>Two new techniques, a multi-frequency VLBI method and the same-beam VLBI method, are used to precisely measure the angular distance between the two sub-satellite radio sources Okina and Ouna. The observations are at three frequencies in S-band, 2212, 2218 and 2287 MHz, and one in X-band, 8456 MHz. We have succeeded in making VLBI observations of Okina/Ouna with VERA and the international network, and have also succeeded in correlating of signals from Okina/Ouna, and obtained phase delays with an accuracy of several pico-seconds in S-band.
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日本惑星科学会秋期講演会予稿集, 2008 15, Nov 1, 2008
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METEORITICS & PLANETARY SCIENCE, 43(7) A64-A64, Jul, 2008
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ADVANCES IN SPACE RESEARCH, 42(2) 331-336, Jul, 2008Results of numerical simulations are presented to examine the global gravity field recovery capability of the Japanese lunar exploration project SELENE (SELenological and ENgineering Explorer) which will be launched in 2007. New characteristics of the SELENE lunar gravimetry include 4-way satellite-to-satellite Doppler tracking of main orbiter and differential VLBI tracking of two small free-flier satellites. It is shown that the proposed satellite constellation will provide the first truly global satellite tracking data coverage. The expected results from these data are; (1) drastic reduction in far-side gravity error, (2) estimation of many gravity coefficients by the observation, not by a priori information, and (3) one order of magnitude improvement over existing gravity models for low-degree field. (C) 2007 COSPAR. Published by Elsevier Ltd. All rights reserved.
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ADVANCES IN SPACE RESEARCH, 42(2) 341-346, Jul, 2008The Japanese lunar explorer SELENE (SElenological and Engineering Explorer), to be launched in 2007, will for the first time utilize VLBI observations in lunar gravimetry investigations. This will particularly improve the accuracy to which the low degree gravitational harmonics and the gravity field near the limb can be measured, and when combined with Doppler measurements will enable three-dimensional information to be extracted. Differential VLBI Radio sources called VRAD experiment involves two on-board sub-satellites, Rstar and Vstar. These will be observed using differential VLBI to measure the trajectories of the satellites with the Japanese network named VERA (VLBI Exploration of Radio Astrometry) and an international VLBI network. We will use a multi-frequency VLBI method to measure the angular distance between the two sub-satellite radio sources Rstar and Vstar. The observations will be at three frequencies in S-band, 2212, 2218 and 2287 MHz, and one in X-band, 8456 MHz. This method uses low power consumption carrier waves, and is suitable for the positioning of spacecraft. The Japanese domestic VLBI network, VERA, will conduct VLBI observations for the whole mission period of one year. In addition, we will conduct two periods of intensive observations, each one month in duration, which will also include the international stations, Shanghai, Urumqi (China), Hobart (Australia) and Wettzell (Germany). These observations will measure the phase delay to an accuracy of better than 0.17 rad (10 deg) in X-band. For a baseline length of 2000 km this is equivalent to a positioning accuracy of about 20 cm, on the Moon. Combining the data from the tracking of the 3 SELENE satellites (main orbiter, Rstar and Vstar) at different :Attitudes and from four-way Doppler measurements, and by making long term observations of the sub-satellites (in excess of one year without any maneuvering), we will be able to improve the accuracy to which the lunar gravitational field is known by an order of magnitude. We have completed the development of on-board instruments, and are carrying out pre-flight tests under a variety of conditions. We have also undertaken test VLBI observations of orbiters such as Geotail, Nozomi and Smart-1 with the international network. (C) 2007 COSPAR. Published by Elsevier Ltd. All rights reserved.
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2007 61-61, 2007We have examined the integrated science of the Moon using KAGUYA (SELENE). The strategy is summarized as: 1) drawing two-dimensional maps to integrate various geologic units into a coherent map, 2) drawing three-dimensional maps of subsurface structures beneath maria and highlands, 3) joint studies of special topics such as mare tectonics and crustal formation, 4) joint studies of advanced topics such as dichotomy and bulk composition. Using the strategy, we will shed light on the tectonics of maria; crustal formation; explorations of polar regions; inner structure of multi-ring crater - Orientale; and lunar environments to figure out the origin and evolution of the Moon.
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2007 62-62, 2007KAGUYA (SELENE) is a Japanese lunar mission which will be launched using H-IIA vehicle in September 2007 by JAXA. We are planning to improve lunar gravity field model by four-way Doppler measurements and differential VLBI observations using three orbiters of KAGUYA (SELENE) mission. KAGUYA is composed of the main orbiter and two small free-flyer subsatellites, i.e., the Relay Satellite (Rstar) and the VLBI Radio Satellite (Vstar). Each subsatellite weighs approximately 50kg.
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Abstracts for fall meeting of the Japanese Society for Planetary Science, 2006 7-7, 2006The observation of Asteroid Itokawa by Hayabusa spacecraft has brought us a lot of new knowledge for very small (about 500m in length) S-type asteroid. We already have started to consider next space mission to small bodies in the solar system. For the next asteroid mission, we would like to explore C-type asteroid, which is also major type in the asteroid belt. This type of asteroid is supposed to have organic matter or water more than S-type asteroid, and it is important to study the material related to life. In this paper, we present the current plan for the next exploration to asteroids. We also want to encourage many researchers to join our asteroid mission.
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J. Geod. Soc. Japan., 47(1) 558-563, 2001
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Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1995 P26, Nov 13, 1995
Professional Memberships
6Research Projects
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科学研究費助成事業, 日本学術振興会, Apr, 2023 - Mar, 2027
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科学研究費助成事業, 日本学術振興会, Apr, 2021 - Mar, 2024
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2012 - Mar, 2015
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, 2008 - 2011
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, 2007 - 2009
