研究者業績
基本情報
- 所属
- 立教大学 理学部 物理学科 教授理学研究科 物理学専攻博士課程後期課程 教授Graduate School of Science Field of Study: Physics Professor国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 特任教授(兼任)宇宙科学研究所 WSO-UVプロジェクト 特任教授
- 学位
- 博士(理学)(東京大学)
- 研究者番号
- 30455464
- J-GLOBAL ID
- 201101036293959472
- researchmap会員ID
- 6000028006
研究キーワード
1研究分野
1経歴
6-
2022年8月 - 現在
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2020年11月 - 現在
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2018年4月 - 現在
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2018年4月 - 現在
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2018年4月 - 現在
学歴
3-
2004年4月 - 2007年3月
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2002年4月 - 2004年3月
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1997年4月 - 2002年3月
受賞
1論文
125-
Space Science Reviews 220(1) 2024年1月24日Abstract Here we describe the novel, multi-point Comet Interceptor mission. It is dedicated to the exploration of a little-processed long-period comet, possibly entering the inner Solar System for the first time, or to encounter an interstellar object originating at another star. The objectives of the mission are to address the following questions: What are the surface composition, shape, morphology, and structure of the target object? What is the composition of the gas and dust in the coma, its connection to the nucleus, and the nature of its interaction with the solar wind? The mission was proposed to the European Space Agency in 2018, and formally adopted by the agency in June 2022, for launch in 2029 together with the Ariel mission. Comet Interceptor will take advantage of the opportunity presented by ESA’s F-Class call for fast, flexible, low-cost missions to which it was proposed. The call required a launch to a halo orbit around the Sun-Earth L2 point. The mission can take advantage of this placement to wait for the discovery of a suitable comet reachable with its minimum $\varDelta $V capability of $600\text{ ms}^{-1}$. Comet Interceptor will be unique in encountering and studying, at a nominal closest approach distance of 1000 km, a comet that represents a near-pristine sample of material from the formation of the Solar System. It will also add a capability that no previous cometary mission has had, which is to deploy two sub-probes – B1, provided by the Japanese space agency, JAXA, and B2 – that will follow different trajectories through the coma. While the main probe passes at a nominal 1000 km distance, probes B1 and B2 will follow different chords through the coma at distances of 850 km and 400 km, respectively. The result will be unique, simultaneous, spatially resolved information of the 3-dimensional properties of the target comet and its interaction with the space environment. We present the mission’s science background leading to these objectives, as well as an overview of the scientific instruments, mission design, and schedule.
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Planetary and Space Science 240 105835-105835 2024年1月
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Communications Earth & Environment 4(1) 2023年9月27日Abstract 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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Spectrochimica Acta Part B: Atomic Spectroscopy 205 106696-106696 2023年7月
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2023年3月9日Abstract The zodiacal light (ZL) is sunlight scattered by interplanetary dust (IPD) in the optical wavelengths. The spatial distribution of IPD in the Solar system may hold an important key to understanding the evolution of the Solar system and material transportation within it. The IPD number density can be expressed as [[EQUATION]] , and the result of [[EQUATION]] was obtained by the previous observations from the interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of [[EQUATION]] based on the ZL observation from the interplanetary space outside the Earth's orbit have been conducted since then. Here we introduce the initial result of the ZL radial profile at optical wavelengths observed at 0.76-1.06 au by ONC-T with Hayabusa2# mission in 2021-2022. The obtained ZL brightness is well reproduced by the model brightness, but there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The obtained radial power-law index is [[EQUATION]] , which is consistent with the previous results based on the ZL observations. The dominant uncertainty source arises from the uncertainty in the Diffuse Galactic Light estimation.
MISC
83-
平成29年度宇宙航行の力学シンポジウム = Symposium on Flight Mechanics and Astrodynamics: 2017 2017年12月平成29年度宇宙航行の力学シンポジウム（2017年12月7日-8日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県著者人数: 11名資料番号: SA6000124018
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第50回月・惑星シンポジウム = Proceedings of the 50th ISAS Lunar and Planetary Symposium 2017年8月第50回月・惑星シンポジウム (2017年8月3-4日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 15名資料番号: SA6000200016
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宇宙科学技術連合講演会講演集 60 6p 2016年9月
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第49回月・惑星シンポジウム = Proceedings of the 49th ISAS Lunar and Planetary Symposium 2016年7月第49回月・惑星シンポジウム (2016年7月20-21日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県資料番号: SA6000059022
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遊・星・人 : 日本惑星科学会誌 24(1) 48-53 2015年3月はやぶさ2に搭載された光学航法カメラ(ONC:Optical Navigation Camera)はその名の通り探査機のナビゲーションの役目を担うカメラであるが,科学観測においても中心的な役割を果たす.本稿では特に小惑星の力学進化過程の復元に向けた,ONC地形観測の戦略について紹介する.
共同研究・競争的資金等の研究課題
17-
科学研究費助成事業 2018年4月 - 2023年3月
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日本学術振興会 科学研究費助成事業 2019年4月 - 2022年3月
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自然科学研究機構 アストロバイオロジーセンター サテライト研究 2018年4月 - 2021年3月
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文部科学省 JAXA戦略的基礎開発予算 2019年4月 - 2020年3月
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宇宙航空研究開発機構 JAXA戦略的基礎開発予算 2018年4月 - 2019年3月
