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



Arakawa, M, Saiki, T, Wada, K, Ogawa, K, Kadono, T, Shirai, K, Sawada, H, Ishibashi, K, Honda, R, Sakatani, N
et al (show 58 more authors) (2020) An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime. SCIENCE, 368 (6486). 67-+.

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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. We discuss implications for Ryugu's surface age.

Item Type: Article
Uncontrolled Keywords: 5109 Space Sciences, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 May 2020 10:03
Last Modified: 21 Jun 2024 11:31
DOI: 10.1126/science.aaz1701
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3084161