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The Morphometry of Impact Craters on Bennu

Abstract : Bennu is an~500-m-diameter rubble-pile asteroid that is the target of detailed study by the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission. Here we use data from the OSIRIS-REx Laser Altimeter to assess depth-to-diameter ratios (d/D) of 108 impact craters larger than 10 m in diameter. The d/D of craters on Bennu ranges from 0.02 to 0.19. The mean is 0.10 ± 0.03. The smallest craters show the broadest range in d/D, consistent with d/D measurements on other asteroids. A few craters have central mounds, which is interpreted as evidence that a more competent substrate lies a few meters beneath them. The range of d/D narrows as crater size increases, with craters larger than 80 m tending toward smaller d/D. At large scales, increases in target strength with depth, combined with target curvature, may affect crater morphometry.
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Submitted on : Monday, December 21, 2020 - 4:11:29 PM
Last modification on : Friday, January 8, 2021 - 3:30:44 AM


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R.T. Daly, E. Bierhaus, Olivier Barnouin, Mike Daly, J. Seabrook, et al.. The Morphometry of Impact Craters on Bennu. Geophysical Research Letters, American Geophysical Union, 2020, 47 (24), ⟨10.1029/2020GL089672⟩. ⟨hal-03085217⟩



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