Construction of the light scattering model of ejecta curtain emerging at impact

2018 Fiscal Year Annual Research Report

• Project/Area Number: 15K05273
• Research Institution: Chiba Institute of Technology
• Principal Investigator: 和田 浩二 千葉工業大学, 惑星探査研究センター, 主席研究員 (10396856)
• Co-Investigator(Kenkyū-buntansha): 荒川 政彦 神戸大学, 理学研究科, 教授 (10222738) ; 木村 宏 千葉工業大学, 惑星探査研究センター, 研究員 (10400011)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Keywords: 天体衝突 / イジェクタ / イジェクタカーテン / 固体惑星探査 / 光散乱

Outline of Annual Research Achievements

平成30年度は、事業期間を一年延長した最終年度であり、大きな成果であるところのアグリゲイトの散乱位相関数を考慮したイジェクタカーテンの光散乱計算に関する論文を完成させることを目指した。その論文については現在ほぼ投稿できる段階にある。また、本研究課題で得られた知見に基づいて、応用例として小惑星 (3200) Phaethon 表層からのイジェクタをモデル化した。さらにイジェクタカーテンの特徴をより理解すべく、空隙率を系統的に50～70%に変化させたシリカ微粒子及び氷微粒子標的に対して高速度衝突によるクレータ形成実験を行い、その時に発生するイジェクタカーテンを高速カメラにより撮影し、数値モデルとの比較のための基礎データを取得した。本研究課題で得られたモデルは、「はやぶさ２」衝突装置によって形成された小惑星リュウグウ上の人工クレータと撮像されたイジェクタカーテンの解釈への適用など、今後有効に活用されると期待される。

Research Products

• [Journal Article] Experimental study on gravitational and atmospheric effects on crater size formed by low‐velocity impacts into granular media (2019)
  • Author(s): Kiuchi M.、Nakamura A.M.、Wada K.
  • Journal Title: Journal of Geophysical Research: Planets Volume: ー Pages: ー
  • DOI: http://doi.org/10.1029/2018JE005628
  • Peer Reviewed
• [Journal Article] Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu - A spinning top-shaped rubble pile (2019)
  • Author(s): Watanabe S., ... Wada, K., ... Arakawa, M., et al.
  • Journal Title: Science Volume: 364 Pages: 268-272
  • DOI: http://doi.org/10.1126/science.aav8032
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Asteroid Ryugu before the Hayabusa2 encounter (2018)
  • Author(s): Wada K., et al.
  • Journal Title: Progress in Earth and Planetary Science Volume: 5 Pages: 82
  • DOI: http://doi.org/10.1186/s40645-018-0237-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Laboratory experiments on agglomeration of particles in a granular stream (2018)
  • Author(s): Nagaashi Yuuya、Omura Tomomi、Kiuchi Masato、Nakamura Akiko M.、Wada Koji、Hasegawa Sunao
  • Journal Title: Progress in Earth and Planetary Science Volume: 5 Pages: 52
  • DOI: https://doi.org/10.1186/s40645-018-0205-6
  • Peer Reviewed
• [Journal Article] Hot grain dynamics by electric charging and magnetic trapping in debris disks (2018)
  • Author(s): Kimura Hiroshi、Kunitomo Masanobu、Suzuki Takeru K.、Robrade Jan、Thebault Philippe、Mitsuishi Ikuyuki
  • Journal Title: Planetary and Space Science Volume: ー Pages: ー
  • DOI: doi:10.1016/j.pss.2018.07.010
  • Peer Reviewed
• [Presentation] Theoretical Predictions for the Total Number and the Flux of Dust Particles in the Ejecta Cloud Around Asteroid 3200 Phaethon Measured by DESTINY+/DDA. (2019)
  • Author(s): Kimura, H., Kobayashi, M., Wada, K., Arai, T., Senshu, H., Hirai, T., Yoshida, F., Ishibashi, K., Hong, P.
  • Organizer: PERC Int'l Symposium on Dust & Parent Bodies 2019 (IDP2019)
  • Int'l Joint Research
• [Presentation] Surface grain sizes of the touch down site revealed by proximity imaging by Hayabusa2 (2018)
  • Author(s): Sakatani, N., Wada, K., et al.
  • Organizer: 2018 AGU fall meeting
  • Int'l Joint Research
• [Presentation] Hayabusa2 Landing Site Selection: Scientific Evaluation on Asteroid Ryugu (2018)
  • Author(s): H. Yabuta, S. Watanabe, T. Nakamura, N. Hirata, S. Sugita, T. Okada, K. Kitazato, Y. Ishihara, T. Morota, N. Sakatani, K. Matsumoto, K. Wada, S. Tachibana, M. Komatsu, E. Tatsumi, M. Matsuoka, C. Honda, T. Hiroi, H. Senshu, R. Honda, Y. Yamamoto, N. Ogawa, S. Kikuchi, T. Saiki, Y. Tsuda
  • Organizer: 2018 AGU fall meeting
  • Int'l Joint Research
• [Presentation] Where to shoot SCI (2018)
  • Author(s): Wada, K.
  • Organizer: 1st International Regolith Science Group & Multi-scale Asteroid Science Group joint meeting
  • Int'l Joint Research
• [Presentation] The Optical and Physical Properties of Cometary Dust Particles from 67P/Churyumov-Gerasimenko Collected in situ by Rosetta/COSIMA. (2018)
  • Author(s): Merouane, S., Langevin, Y., Vincendon, M., Hilchenbach, M., Kimura, H., Hornung, K., and Ligier, N.
  • Organizer: EGU General Assembly 2018
  • Int'l Joint Research
• [Presentation] Dust Astronomy with DESTINY PLUS at 1 AU. (2018)
  • Author(s): Srama, R., Kobayashi, M., Krueger, H., Arai, T., Kimura, H., Trieloff, M., Agarwal, J., Moragas-Klostermeyer, G., Li, Y., Posterberg, F., Khawaja, N., Albin, T., Simolka, J., Strack, H., Fiege, K., Altobelli, N., Horanyi, M., Hsu, S., Kempf, S., and Sternovsky, Z.
  • Organizer: EGU General Assembly 2018
  • Int'l Joint Research
• [Presentation] Preliminary Results of Numerical Simulation on DESTINY+/DDA’s Detection of Dust Particles Ejected from Asteroid 3200 Phaethon by Bombardments of Interplanetary Dust (2018)
  • Author(s): Kimura, H., Kobayashi, M., Wada, K., Arai, T., Hirai, T., Yoshida, F., Ishibashi, K., Hong, P.
  • Organizer: Dusty Visions 2018
  • Int'l Joint Research
• [Presentation] An Overview of the Destiny+ Geminids Parent (3200) Phaethon Flyby Mission. (2018)
  • Author(s): Arai, T., Kobayashi, M., Ishibashi, K., Yoshida, F., Kimura, H., Watanabe, J., Ito, T., Senshu, H., Wada, K., Ishiguro, M., Nakamura, T., Yabuta, H., Tachibana, S., Okada, T., Iwata, T, Ootsubo, T., Kawakatsu, Y., Toyota, H., Nishiyama, K., and Takashima, T.
  • Organizer: Asia Oceania Geosciences Society 15th Annual Meeting
  • Int'l Joint Research
• [Presentation] Dust Astronomy with DESTINY+. (2018)
  • Author(s): Srama, R., Kobayashi, M., Arai, T., Kimura, H., and Krueger, H.
  • Organizer: The 42nd COSPAR Scientific Assembly
  • Int'l Joint Research
• [Presentation] An Overview of the DESTINY+ Mission: Flyby of Geminids Parent (3200) Phaethon and In-situ Dust Analyses. (2018)
  • Author(s): Arai, T., ..., Wada, K., et al.
  • Organizer: The 42nd COSPAR Scientific Assembly
  • Int'l Joint Research
• [Presentation] High Performance Computing of Light Scattering by Aggregate Dust Particles of Organic-rich Submicron Grains with Improvements to the MSTM Code. (2018)
  • Author(s): Kimura, H., Kanada, Y., Matsui, T.
  • Organizer: Cosmic Dust
  • Int'l Joint Research
• [Presentation] Dust Simulations for the Destiny+ Mission to (3200) Phaethon (2018)
  • Author(s): Krueger, H., Kobayashi, M., Arai, T., Srama, R., Sarli, B. V., Kimura, H., Hirai, T., Moragas-Klostermeyer, G., Soja, R., Strack, H., Altobelli, N., Strub, P., Sterken, V., Grun, E.
  • Organizer: European Planetary Science Congress 2018
  • Int'l Joint Research
• [Presentation] Experimental study on scaling laws for high-velocity impact phenomena on water ice targets (2018)
  • Author(s): Arakawa, M.
  • Organizer: 9th Workshop on Catastrophic Disruption in the Solar System
  • Int'l Joint Research / Invited
• [Presentation] 高空隙率シリカ層への衝突実験とクレータリングにおける空隙率の効果 (2018)
  • Author(s): 石黒琢也，荒川政彦，保井みなみ
  • Organizer: 日本惑星科学秋季講演会2018
• [Presentation] 小型搭載型衝突装置と分離カメラを用いたリュウグウ上での宇宙衝突実験 (2018)
  • Author(s): 荒川政彦，はやぶさ2 SCI/DCAM3チーム
  • Organizer: 日本地球惑星科学連合2018年大会
  • Invited