@article{a4cacf3045da4217b7a3341a3e93c101,
title = "Internal rubble properties of asteroid (101955) Bennu",
abstract = "Exploration of asteroid (101955) Bennu by the OSIRIS-REx mission has provided an in-depth look at this rubble-pile near-Earth asteroid. In particular, the measured gravity field and the detailed shape model of Bennu indicate significant heterogeneities in its interior structure, compatible with a lower density at its center. Here we combine gravity inversion methods with a statistical rubble-pile model to determine the density and size-frequency distribution (SFD) index of the rubble that constitutes Bennu. The best-fitting models indicate that the SFD of the interior is consistent with that observed on the surface, with a cumulative SFD index of approximately −2.9. The rubble bulk density is approximately 1.35 g/cm3, corresponding to a 12% macro-porosity. We find the largest rubble particle to be approximately 145 m, whereas the largest void is approximately 10 m.",
keywords = "Bennu, Interior structure of asteroids, Meteorites, Near-Earth asteroids, OSIRIS-REx",
author = "P. Tricarico and Scheeres, {D. J.} and French, {A. S.} and McMahon, {J. W.} and Brack, {D. N.} and Leonard, {J. M.} and P. Antreasian and Chesley, {S. R.} and D. Farnocchia and Y. Takahashi and Mazarico, {E. M.} and D. Rowlands and D. Highsmith and K. Getzandanner and M. Moreau and Johnson, {C. L.} and L. Philpott and Bierhaus, {E. B.} and Walsh, {K. J.} and Barnouin, {O. S.} and Palmer, {E. E.} and Weirich, {J. R.} and Gaskell, {R. W.} and Daly, {M. G.} and Seabrook, {J. A.} and Nolan, {M. C.} and Lauretta, {D. S.}",
note = "Funding Information: We are grateful to the entire OSIRIS-REx Team for making the encounter with Bennu possible. This material is based upon work supported by NASA under Contract NNM10AA11C issued through the New Frontiers Program. This research is supported by the NASA OSIRIS-REx Participating Scientists Program , grant 80NSSC18K0280 to the Planetary Science Institute . Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology , under a contract with the National Aeronautics and Space Administration ( 80NM0018D0004 ). Funding Information: We are grateful to the entire OSIRIS-REx Team for making the encounter with Bennu possible. This material is based upon work supported by NASA under Contract NNM10AA11C issued through the New Frontiers Program. This research is supported by the NASA OSIRIS-REx Participating Scientists Program, grant 80NSSC18K0280 to the Planetary Science Institute. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). Publisher Copyright: {\textcopyright} 2021 Elsevier Inc.",
year = "2021",
month = dec,
doi = "10.1016/j.icarus.2021.114665",
language = "English (US)",
volume = "370",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
}