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An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime

by Tanaka, S. , Iwata, T. , Hirata, N. , Yamada, M. , Kameda, S. , Noguchi, R. , Ozaki, M. , Ishibashi, K. , Cho, Y. , Yoshikawa, K. , Hirose, C. , Mimasu, Y. , Tatsumi, E. , Watanabe, S. , Iijima, Y. , Terui, F. , Kimura, S. , Yano, H. , Honda, R. , Takagi, Y. , Miura, A. , Yamamoto, Y. , Kitazato, K. , Sawada, H. , Imamura, H. , Nakazawa, S. , Takei, Y. , Takahashi, T. , Morota, T. , Fujii, A. , Jutzi, M. , Hayakawa, H. , Matsuoka, M. , Saiki, T. , Ogawa, K. , Shimada, T. , Okamoto, C. , Wada, K. , Soldini, S. , Arakawa, M. , Yoshioka, K. , Shirai, K. , Yoshikawa, M. , Mori, O. , Toda, T. , Yamaguchi, T. , Ogawa, N. , Abe, M. , Kikuchi, S. , Kouyama, T. , Namiki, N. , Tachibana, S. , Hayakawa, M. , Kadono, T. , Hosoda, S. , Shimaki, Y. , Yokota, Y. , Sakatani, N. , Tsuda, Y. , Okada, T. , Ono, G. , Takeuchi, H. , Tsukizaki, R. , Sugita, S. , Honda, C. , Ikeda, H. , Michel, P.

in Asteroids / Astrophysics / Cameras / Craters / Earth and Planetary Astrophysics / Ejecta / Gravitation / Gravity / Impact analysis / Japanese spacecraft / Sciences of the Universe / Spacecraft

2020

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An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime

in Asteroids / Astrophysics / Cameras / Craters / Earth and Planetary Astrophysics / Ejecta / Gravitation / Gravity / Impact analysis / Japanese spacecraft / Sciences of the Universe / Spacecraft

2020

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An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime

in Asteroids / Astrophysics / Cameras / Craters / Earth and Planetary Astrophysics / Ejecta / Gravitation / Gravity / Impact analysis / Japanese spacecraft / Sciences of the Universe / Spacecraft

2020

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Journal Article

An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime

Tanaka, S.,

Iwata, T.,

Hirata, N.,

Yamada, M.,

Kameda, S.,

Noguchi, R.,

Ozaki, M.,

Ishibashi, K.,

Cho, Y.,

Yoshikawa, K.,

Hirose, C.,

Mimasu, Y.,

Tatsumi, E.,

Watanabe, S.,

Iijima, Y.,

Terui, F.,

Kimura, S.,

Yano, H.,

Honda, R.,

Takagi, Y.,

Miura, A.,

Yamamoto, Y.,

Kitazato, K.,

Sawada, H.,

Imamura, H.,

Nakazawa, S.,

Takei, Y.,

Takahashi, T.,

Morota, T.,

Fujii, A.,

Jutzi, M.,

Hayakawa, H.,

Matsuoka, M.,

Saiki, T.,

Ogawa, K.,

Shimada, T.,

Okamoto, C.,

Wada, K.,

Soldini, S.,

Arakawa, M.,

Yoshioka, K.,

Shirai, K.,

Yoshikawa, M.,

Mori, O.,

Toda, T.,

Yamaguchi, T.,

Ogawa, N.,

Abe, M.,

Kikuchi, S.,

Kouyama, T.,

Namiki, N.,

Tachibana, S.,

Hayakawa, M.,

Kadono, T.,

Hosoda, S.,

Shimaki, Y.,

Yokota, Y.,

Sakatani, N.,

Tsuda, Y.,

Okada, T.,

Ono, G.,

Takeuchi, H.,

Tsukizaki, R.,

Sugita, S.,

Honda, C.,

Ikeda, H.,

Michel, P.

2020

Overview

The Hayabusa2 spacecraft investigated the small asteroid Ryugu, which has a rubble-pile structure. We describe an impact experiment on Ryugu using Hayabusa2’s Small Carry-on Impactor. The impact produced an artificial crater with a diameter >10 meters, which has a semicircular shape, an elevated rim, and a central pit. Images of the impact and resulting ejecta were recorded by the Deployable CAMera 3 for >8 minutes, showing the growth of an ejecta curtain (the outer edge of the ejecta) and deposition of ejecta onto the surface. The ejecta curtain was asymmetric and heterogeneous and it never fully detached from the surface. The crater formed in the gravity-dominated regime; in other words, crater growth was limited by gravity not surface strength. We discuss implications for Ryugu’s surface age.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science,American Association for the Advancement of Science (AAAS)

Subject

Asteroids

/ Astrophysics

/ Cameras

/ Craters

/ Earth and Planetary Astrophysics

/ Ejecta

/ Gravitation

/ Gravity

/ Impact analysis

/ Japanese spacecraft

/ Sciences of the Universe