研究者業績
基本情報
- 所属
- 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 宇宙飛翔工学研究系 教授(兼任)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 プロジェクトマネージャ
- 学位
- 博士（工学）(東京大学)
- J-GLOBAL ID
- 200901025451103270
- researchmap会員ID
- 5000092382
- 外部リンク
研究キーワード
7研究分野
1論文
190-
Icarus 377 114882-114882 2022年5月
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Acta Astronautica 2022年4月
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Earth, Planets and Space 74(1) 2022年1月 査読有り招待有りMartian moons exploration, MMX, is the new sample return mission planned by the Japan Aerospace Exploration Agency (JAXA) targeting the two Martian moons with the scheduled launch in 2024 and return to the Earth in 2029. The major scientific objectives of this mission are to determine the origin of Phobos and Deimos, to elucidate the early Solar System evolution in terms of volatile delivery across the snow line to the terrestrial planets having habitable surface environments, and to explore the evolutionary processes of both moons and Mars surface environment. To achieve these objectives, during a stay in circum-Martian space over about 3 years MMX will collect samples from Phobos along with close-up observations of this inner moon and carry out multiple flybys of Deimos to make comparative observations of this outer moon. Simultaneously, successive observations of the Martian atmosphere will also be made by utilizing the advantage of quasi-equatorial spacecraft orbits along the moons' orbits.
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EARTH PLANETS AND SPACE 73(1) 2021年12月 査読有りThe science operations of the spacecraft and remote sensing instruments for the Martian Moon eXploration (MMX) mission are discussed by the mission operation working team. In this paper, we describe the Phobos observations during the first 1.5 years of the spacecraft's stay around Mars, and the Deimos observations before leaving the Martian system. In the Phobos observation, the spacecraft will be placed in low-altitude quasi-satellite orbits on the equatorial plane of Phobos and will make high-resolution topographic and spectroscopic observations of the Phobos surface from five different altitudes orbits. The spacecraft will also attempt to observe polar regions of Phobos from a three-dimensional quasi-satellite orbit moving out of the equatorial plane of Phobos. From these observations, we will constrain the origin of Phobos and Deimos and select places for landing site candidates for sample collection. For the Deimos observations, the spacecraft will be injected into two resonant orbits and will perform many flybys to observe the surface of Deimos over as large an area as possible.
MISC
301-
60th International Astronautical Congress 2009, IAC 2009 2 1140-1149 2009年 査読有りJapan Aerospace Exploration Agency has established a novel working group for the next Mars exploration program named MELOS to be started in the late 2010's. This paper describes the preliminary mission analysis and orbit design for several candidate plans. Synergic exploration by several spacecraft requires complicated and careful consideration, different from single-probe missions. Some mission plans to realize required configuration and simple simulation results are reported.
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A Collection of Technical Papers of The 18th Workshop on Astrodynamics and Flight Mechanics 155-160 2008年7月
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Transactions of the Japan Society for Aeronautical and Space Sciences, Space Technology Japan (Web) 5(5) 1-7 2007年Discussed in this paper is a lunar approach strategy tolerant of a lunar orbit injection (LOI) failure. LOI is one of the most critical events for a lunar orbiting mission. If LOI is not performed, the spacecraft flies by the moon, and in the worst case, it escapes not only from the moon but also from the earth, which leads to mission failure. The proposed strategy is to design a trajectory so as to re-encounter the moon even when LOI is not performed. It provides an opportunity for mission recovery even in the case of an unexpected fly-by. A trajectory design procedure is introduced and an example of the designed trajectory is shown.
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宇宙技術 6(6) 87-96 2007年Analyzed in this paper are Near-Earth Asteroids sample return mission opportunities in early 2010s. The mission sequences supposed are Keplerian orbits connected with impulsive velocity changes including planetary gravity assists. The sequences are constructed by "trajectory parts connecting method", which is exploited by the author. The method enables to construct the possible sequences comprehensively under defined structure and given constraints. At the same time, it enables to assess the dynamical feasibility of the constructed sequences quantitatively by way of the total required velocity increment required to complete the sequences. Over 4000 Near-Earth Asteroids are taken into account as the candidates of the mission targets, and the mission sequences include not only the sample return from a single asteroid, but also the sample return from two asteroids. Lists of the asteroids (or their combinations) which have mission opportunities in early 2010s are provided and some example sequences are shown.
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Transactions of the Japan Society for Aeronautical and Space Sciences, Space Technology Japan (Web) 5(5) 9-15 2007年In this paper, the translunar trajectory of the simple sequence is investigated. The trajectory discussed in this paper is a two-burn ballistic trajectory from the low earth parking orbit to the low lunar orbit. The problem is practical in that the geometric relation from the launch site to the moon is fully considered. The paper includes three subjects. First is the structure of the problem and the solution space. The problems are defined and the solutions are grouped by the properties of the lunar transfer sequence. Second are the characteristics of optimal solutions. The topics discussed are the transition of the required velocity increment based on the launch date, and the difference according to the property of the lunar transfer sequence. Third is the sensitivity analysis of a number of items to the deviation of the parameters from the optimal solution.
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日本惑星科学会秋季講演会予稿集 2006 7-7 2006年小惑星探査機「はやぶさ」による小惑星イトカワの観測で、500m程度の小さなＳ型小惑星についての理解が深まったが、我々は、さらに次の小天体探査ミッションについての検討を行っている。次のミッションとしては、Ｓ型と同様に小惑星帯で主要なタイプとなっているＣ型小惑星の探査を行いたい。このタイプでは、有機物や水をより多く含んでいると思われており、生命前駆物質の科学としても重要である。ここでは、これまでのミッション検討結果をまとめて報告する。また、是非、多くの研究者に小天体探査に参加してもらうことを呼びかけたい。
講演・口頭発表等
11-
71st International Astronautical Congress 2020年10月
共同研究・競争的資金等の研究課題
9-
日本学術振興会 科学研究費助成事業 2022年4月 - 2024年3月
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日本学術振興会 科学研究費助成事業 2021年11月 - 2024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 - 2021年3月
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日本学術振興会 科学研究費助成事業 2014年4月 - 2017年3月
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日本学術振興会 科学研究費助成事業 2015年10月 - 2016年3月
