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.; Iijima, Y.; Okamoto, C.; Yano, H.; Takagi, Y.; Hayakawa, M.; Michel, P.; Jutzi, M.; Shimaki, Y.; Kimura, S.; Mimasu, Y.; ... (2020). An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime. Science, 368(6486), pp. 67-71. American Association for the Advancement of Science 10.1126/science.aaz1701

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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:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Jutzi, Martin

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0036-8075

Publisher:

American Association for the Advancement of Science

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

03 Nov 2020 09:47

Last Modified:

03 Nov 2020 09:47

Publisher DOI:

10.1126/science.aaz1701

BORIS DOI:

10.7892/boris.147134

URI:

https://boris.unibe.ch/id/eprint/147134

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