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Astrodynamics

Article Title

Motion reconstruction of the small carry-on impactor aboard Hayabusa2

Authors

Takanao Saiki, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Yuya Mimasu, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Yuto Takei, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Manabu Yamada, Chiba Institute of Technology, Narashino 275-0016, Japan
Hirotaka Sawada, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Kazunori Ogawa, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;Kobe University, Kobe 657-8501, Japan
Naoko Ogawa, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Hiroshi Takeuchi, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan
Akira Miura, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan
Yuri Shimaki, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Koji Wada, Chiba Institute of Technology, Narashino 275-0016, Japan
Rie Honda, Kochi University, Kochi 780-8520, Japan
Yasuhiro Yokota, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;Kochi University, Kochi 780-8520, Japan
Kei Shirai, Kobe University, Kobe 657-8501, Japan
Naruhisa Sano, IHI Aerospace Co., Ltd., Tomioka 370-2398, Japan
Hirohito Ohtsuka, IHI Aerospace Co., Ltd., Tomioka 370-2398, Japan
Go Ono, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Kent Yoshikawa, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Shota Kikuchi, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Chikako Hirose, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Yukio Yamamoto, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan
Takahiro Iwata, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan
Masahiko Arakawa, Kobe University, Kobe 657-8501, Japan
Seiji Sugita, Chiba Institute of Technology, Narashino 275-0016, Japan;The University of Tokyo, Tokyo 113-0033, Japan
Satoshi Tanaka, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan
Fuyuto Terui, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Makoto Yoshikawa, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan
Satoru Nakazawa, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Sei-ichiro Watanabe, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;Nagoya University, Nagoya 464-8601, Japan
Yuichi Tsuda, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan;The Graduate University for Advanced Studies, Sagamihara 252-5210, Japan

Keywords

small body exploration, Hayabusa2, kinetic impact, artificial crater, motion reconstruction

Abstract

Subsurface exploration is one of the most ambitious scientific objectives of the Hayabusa2 mission. A small device called small carry-on impactor (SCI) was developed to create an artificial crater on the surface of asteroid Ryugu. This enables us to sample subsurface materials, which will provide a window to the past. The physical properties of the resulting crater are also useful for understanding the internal structure of Ryugu. Accurate understanding of the crater and ejecta properties, including the depth of excavation of subsurface materials, requires accurate information on impact conditions. In particular, the impact angle is a critical factor because it greatly influences the size and shape of the crater. On April 5, 2019, the Hayabusa2 spacecraft deployed the SCI at 500 m of altitude above the asteroid surface. The SCI gradually reduced its altitude, and it shot a 2 kg copper projectile into the asteroid 40 min after separation. Estimating the position of the released SCI is essential for determining the impact angle. This study describes the motion reconstruction of the SCI based on the actual operation data. The results indicate that the SCI was released with high accuracy.

Publisher

Tsinghua University Press

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