The morphometry of impact craters on Bennu

Author(s)

E.B. Bierhaus, O.S. Barnouin, M.G. Daly, J.A. Seabrook, J.H. Roberts, C.M. Ernst, M.E. Perry, H. Nair, R.C. Espiritu, E.E. Palmer, R.W. Gaskell, J.R. Weirich, H.C.M. Susorney, C.L. Johnson, K.J. Walsh, M.C. Nolan, E.R. Jawin, P. Michel, D. Trang, and D.S. Lauretta

Publication Year

-

Journal

Geophysical Research Letters

DOI

n/a

Description

Bennu is a ~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.

Files

Preview Filename Description
daly-et-al_grl_bennucrater_dd_tables1.csv

Supporting Table S1, which contains the data used to generate the figures in the paper.

daly-et-al_grl_bennucrater_dd_impactcraterdtms.zip

Digital terrrain models (DTMs) of impact craters on Bennu analyzed in this study.

Uploaded by tdaly on Sept. 3, 2020, 4:06 p.m.
Last modified Sept. 3, 2020, 4:07 p.m.