An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime
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 elev...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2020-04, Vol.368 (6486), p.67-71 |
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| creator | Arakawa, M Saiki, T Wada, K Ogawa, K Kadono, T Shirai, K Sawada, H Ishibashi, K Honda, R Sakatani, N Iijima, Y Okamoto, C Yano, H Takagi, Y Hayakawa, M Michel, P Jutzi, M Shimaki, Y Kimura, S Mimasu, Y Toda, T Imamura, H Nakazawa, S Hayakawa, H Sugita, S Morota, T Kameda, S Tatsumi, E Cho, Y Yoshioka, K Yokota, Y Matsuoka, M Yamada, M Kouyama, T Honda, C Tsuda, Y Watanabe, S Yoshikawa, M Tanaka, S Terui, F Kikuchi, S Yamaguchi, T Ogawa, N Ono, G Yoshikawa, K Takahashi, T Takei, Y Fujii, A Takeuchi, H Yamamoto, Y Okada, T Hirose, C Hosoda, S Mori, O Shimada, T Soldini, S Tsukizaki, R Iwata, T Ozaki, M Abe, M Namiki, N Kitazato, K Tachibana, S Ikeda, H Hirata, N Hirata, N Noguchi, R Miura, A |
| description | 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. |
| doi_str_mv | 10.1126/science.aaz1701 |
| format | Article |
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We discuss implications for Ryugu's surface age.</description><identifier>ISSN: 0036-8075</identifier><identifier>EISSN: 1095-9203</identifier><identifier>DOI: 10.1126/science.aaz1701</identifier><identifier>PMID: 32193363</identifier><language>eng</language><publisher>United States: The American Association for the Advancement of Science</publisher><subject>Asteroids ; Astrophysics ; Cameras ; Craters ; Earth and Planetary Astrophysics ; Ejecta ; Gravitation ; Gravity ; Impact analysis ; Japanese spacecraft ; Sciences of the Universe ; Spacecraft</subject><ispartof>Science (American Association for the Advancement of Science), 2020-04, Vol.368 (6486), p.67-71</ispartof><rights>Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.</rights><rights>Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. 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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.</description><subject>Asteroids</subject><subject>Astrophysics</subject><subject>Cameras</subject><subject>Craters</subject><subject>Earth and Planetary Astrophysics</subject><subject>Ejecta</subject><subject>Gravitation</subject><subject>Gravity</subject><subject>Impact analysis</subject><subject>Japanese spacecraft</subject><subject>Sciences of the 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artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime</title><author>Arakawa, M ; Saiki, T ; Wada, K ; Ogawa, K ; Kadono, T ; Shirai, K ; Sawada, H ; Ishibashi, K ; Honda, R ; Sakatani, N ; Iijima, Y ; Okamoto, C ; Yano, H ; Takagi, Y ; Hayakawa, M ; Michel, P ; Jutzi, M ; Shimaki, Y ; Kimura, S ; Mimasu, Y ; Toda, T ; Imamura, H ; Nakazawa, S ; Hayakawa, H ; Sugita, S ; Morota, T ; Kameda, S ; Tatsumi, E ; Cho, Y ; Yoshioka, K ; Yokota, Y ; Matsuoka, M ; Yamada, M ; Kouyama, T ; Honda, C ; Tsuda, Y ; Watanabe, S ; Yoshikawa, M ; Tanaka, S ; Terui, F ; Kikuchi, S ; Yamaguchi, T ; Ogawa, N ; Ono, G ; Yoshikawa, K ; Takahashi, T ; Takei, Y ; Fujii, A ; Takeuchi, H ; Yamamoto, Y ; Okada, T ; Hirose, C ; Hosoda, S ; Mori, O ; Shimada, T ; Soldini, S ; Tsukizaki, R ; Iwata, T ; Ozaki, M ; Abe, M ; Namiki, N ; Kitazato, K ; Tachibana, S ; Ikeda, H ; Hirata, N ; Hirata, N ; Noguchi, R ; Miura, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a489t-bfcb7da5c461eba8f07b2bfa3a4d1a75c806a5da03ea80d18100ffaeec3854863</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Asteroids</topic><topic>Astrophysics</topic><topic>Cameras</topic><topic>Craters</topic><topic>Earth and Planetary Astrophysics</topic><topic>Ejecta</topic><topic>Gravitation</topic><topic>Gravity</topic><topic>Impact analysis</topic><topic>Japanese spacecraft</topic><topic>Sciences of the Universe</topic><topic>Spacecraft</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Arakawa, M</creatorcontrib><creatorcontrib>Saiki, T</creatorcontrib><creatorcontrib>Wada, K</creatorcontrib><creatorcontrib>Ogawa, K</creatorcontrib><creatorcontrib>Kadono, T</creatorcontrib><creatorcontrib>Shirai, K</creatorcontrib><creatorcontrib>Sawada, 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(HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Science (American Association for the Advancement of Science)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Arakawa, M</au><au>Saiki, T</au><au>Wada, K</au><au>Ogawa, K</au><au>Kadono, T</au><au>Shirai, K</au><au>Sawada, H</au><au>Ishibashi, K</au><au>Honda, R</au><au>Sakatani, N</au><au>Iijima, Y</au><au>Okamoto, C</au><au>Yano, H</au><au>Takagi, Y</au><au>Hayakawa, M</au><au>Michel, P</au><au>Jutzi, M</au><au>Shimaki, Y</au><au>Kimura, S</au><au>Mimasu, Y</au><au>Toda, T</au><au>Imamura, H</au><au>Nakazawa, S</au><au>Hayakawa, H</au><au>Sugita, S</au><au>Morota, T</au><au>Kameda, S</au><au>Tatsumi, E</au><au>Cho, Y</au><au>Yoshioka, K</au><au>Yokota, Y</au><au>Matsuoka, M</au><au>Yamada, M</au><au>Kouyama, T</au><au>Honda, C</au><au>Tsuda, Y</au><au>Watanabe, S</au><au>Yoshikawa, M</au><au>Tanaka, S</au><au>Terui, F</au><au>Kikuchi, S</au><au>Yamaguchi, T</au><au>Ogawa, N</au><au>Ono, G</au><au>Yoshikawa, K</au><au>Takahashi, T</au><au>Takei, Y</au><au>Fujii, A</au><au>Takeuchi, H</au><au>Yamamoto, Y</au><au>Okada, T</au><au>Hirose, C</au><au>Hosoda, S</au><au>Mori, O</au><au>Shimada, T</au><au>Soldini, S</au><au>Tsukizaki, R</au><au>Iwata, T</au><au>Ozaki, M</au><au>Abe, M</au><au>Namiki, N</au><au>Kitazato, K</au><au>Tachibana, S</au><au>Ikeda, H</au><au>Hirata, N</au><au>Hirata, N</au><au>Noguchi, R</au><au>Miura, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime</atitle><jtitle>Science (American Association for the Advancement of Science)</jtitle><addtitle>Science</addtitle><date>2020-04-03</date><risdate>2020</risdate><volume>368</volume><issue>6486</issue><spage>67</spage><epage>71</epage><pages>67-71</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><abstract>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. 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| fulltext | fulltext |
| identifier | ISSN: 0036-8075 |
| ispartof | Science (American Association for the Advancement of Science), 2020-04, Vol.368 (6486), p.67-71 |
| issn | 0036-8075 1095-9203 |
| language | eng |
| recordid | cdi_hal_primary_oai_HAL_hal_02986191v1 |
| source | American Association for the Advancement of Science |
| subjects | Asteroids Astrophysics Cameras Craters Earth and Planetary Astrophysics Ejecta Gravitation Gravity Impact analysis Japanese spacecraft Sciences of the Universe Spacecraft |
| title | An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime |
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