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Orbital Dynamics in Strongly Perturbed Environments around Asteroids

Research Project

Project/Area Number 19K21075
Project/Area Number (Other) 18H05901 (2018)
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund (2019)
Single-year Grants (2018)
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionJapan Aerospace EXploration Agency

Principal Investigator

Kikuchi Shota  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, 宇宙航空プロジェクト研究員 (90830068)

Project Period (FY) 2018-08-24 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords探査機 / 軌道設計 / 小惑星 / 摂動 / 太陽光圧 / 重力場 / 宇宙機
Outline of Research at the Start

小惑星近傍では力学的に外乱の強い環境(強摂動環境)が形成され,探査機の軌道運動は強く乱される.このような環境での安定的な探査機運用は,消費燃料や小惑星との位置関係の観点から制約が大きい.そこで本研究では,強摂動環境下でも燃料消費が少なくかつ自由度の高い安定な小惑星周回軌道を研究する.具体的には,1周に1回少量の速度変化を与えることで,人工的に周期性を持たせるRTO (Retrograde Teardrop Orbit) を提案する.RTOは強摂動環境下でも安定であり,かつ自由度が高い周回軌道である.本研究では,RTOの応用として,はやぶさ2ミッションでの実用化計画を含めた解析を行う.

Outline of Final Research Achievements

The orbital motion of spacecraft in the vicinity of asteroids is strongly disturbed and exhibits complex behaviors because of weak and irregular gravitational force. The main focus of this study is the dynamics of spacecraft in the strongly perturbed environment around asteroids. This research first proposed retrograde teardrop orbits, which are made periodic by introducing a deterministic thrusting maneuver within each period to ensure long-term stability. In addition, based on the constructed dynamical model, frozen orbit solutions were identified, in which the orbital elements remain constant even under solar radiation and gravitational perturbations. Another contribution of this research is the trajectory design for the Hayabusa2 precision touchdown incorporating the effect of irregular surface gravity field. Using the designed landing trajectory, Hayabusa2 successfully conducted touchdowns on the asteroid Ryugu in 2019.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果を応用すると,より高度かつ確実に小惑星探査を行うことが可能となる.小惑星は太陽系形成当初の姿をよく保っていると考えられており,本研究による小惑星探査技術の高度化は,太陽系や生命の起源解明につながり得る成果である.実際に,はやぶさ2では本研究で設計された着陸軌道を用いて,小惑星リュウグウへの2度のタッチダウンに成功しており,小惑星サンプル採取の成功に貢献した.また,惑星科学上の学術的意義のみならず,将来の鉱物資源の獲得や,地球への隕石衝突回避につながり得る点で,本研究の成果は社会的にも大きな意義を持つ.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Annual Research Report
  • Research Products

    (6 results)

All 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Design and Reconstruction of the Hayabusa2 Precision Landing on Ryugu2020

    • Author(s)
      Kikuchi Shota、Terui Fuyuto、Ogawa Naoko、Saiki Takanao、Ono Go、Yoshikawa Kent、Takei Yuto、Mimasu Yuya、Ikeda Hitoshi、Sawada Hirotaka、Wal Stefaan Van、Sugita Seiji、Watanabe Sei-ichiro、Tsuda Yuichi
    • Journal Title

      Journal of Spacecraft and Rockets

      Volume: 57 Issue: 5 Pages: 1033-1060

    • DOI

      10.2514/1.a34683

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hayabusa2 Landing Site Selection: Surface Topography of Ryugu and Touchdown Safety2020

    • Author(s)
      Kikuchi Shota、Watanabe Sei-ichiro、Saiki Takanao、Yabuta Hikaru et al. (53人中4番目)
    • Journal Title

      Space Science Reviews

      Volume: 216 Issue: 7 Pages: 116-116

    • DOI

      10.1007/s11214-020-00737-z

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stability Analysis of Coupled Orbit-Attitude Dynamics Around Asteroids Using Finite-Time Lyapunov Exponents2019

    • Author(s)
      Shota Kikuchi, Yuichi Tsuda, Makoto Yoshikawa, Jun’ichiro Kawaguchi
    • Journal Title

      Journal of Guidance, Control and Dynamics

      Volume: 42(6) Issue: 6 Pages: 1289-1305

    • DOI

      10.2514/1.g003879

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Frozen Orbits under Radiation Pressure and Zonal Gravity Perturbations2020

    • Author(s)
      S. Kikuchi, Y. Oki, and Y. Tsuda
    • Organizer
      30th AIAA/AAS Space Flight Mechanics Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and Reconstruction of the Hayabusa2 Precision Landing on Ryugu2019

    • Author(s)
      S. Kikuchi, F. Terui, N. Ogawa, T. Saiki, G. Ono, K. Yoshikawa, Y. Takei, Y. Mimasu, H. Ikeda, H. Sawada, T. Morota, N. Hirata, N. Hirata, T. Kouyama, S. Kameda, and Y. Tsuda
    • Organizer
      2019 AAS/AIAA Astrodynamics Specialist Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Retrograde Teardrop Orbits about Asteroids: Application to the Hayabusa2 Mission2019

    • Author(s)
      S. Kikuchi, Y. Oki, T. Saiki, Y. Takei, H. Takeuchi, G. Ono, H. Ikeda, and Y. Tsuda
    • Organizer
      29th AAS/AIAA Space Flight Mechanics Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2018-08-27   Modified: 2024-03-26  

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