Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface

The OSIRIS-REx Team

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where they originate, and thermal or tidal processes act on them once they become near-Earth asteroids. Here we present early measurements of numerous large candidate impact craters on near-Earth asteroid (101955) Bennu by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) mission, which indicate a surface that is between 100 million and 1 billion years old, predating Bennu’s expected duration as a near-Earth asteroid. We also observe many fractured boulders, the morphology of which suggests an influence of impact or thermal processes over a considerable amount of time since the boulders were exposed at the surface. However, the surface also shows signs of more recent mass movement: clusters of boulders at topographic lows, a deficiency of small craters and infill of large craters. The oldest features likely record events from Bennu’s time in the main asteroid belt.

Original languageEnglish
JournalNature Geoscience
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

regolith
asteroid
crater
mass movement
infill
resource

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface. / The OSIRIS-REx Team.

In: Nature Geoscience, 01.01.2019.

Research output: Contribution to journalArticle

@article{358aaa4958384b7fb04e6fbb87c0c5ea,
title = "Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface",
abstract = "Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where they originate, and thermal or tidal processes act on them once they become near-Earth asteroids. Here we present early measurements of numerous large candidate impact craters on near-Earth asteroid (101955) Bennu by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) mission, which indicate a surface that is between 100 million and 1 billion years old, predating Bennu’s expected duration as a near-Earth asteroid. We also observe many fractured boulders, the morphology of which suggests an influence of impact or thermal processes over a considerable amount of time since the boulders were exposed at the surface. However, the surface also shows signs of more recent mass movement: clusters of boulders at topographic lows, a deficiency of small craters and infill of large craters. The oldest features likely record events from Bennu’s time in the main asteroid belt.",
author = "{The OSIRIS-REx Team} and Walsh, {K. J.} and Jawin, {E. R.} and Ballouz, {R. L.} and Barnouin, {O. S.} and Bierhaus, {E. B.} and Connolly, {H. C.} and Molaro, {J. L.} and McCoy, {T. J.} and M. Delbo’ and Hartzell, {C. M.} and M. Pajola and Schwartz, {S. R.} and D. Trang and E. Asphaug and Becker, {K. J.} and Beddingfield, {C. B.} and Bennett, {C. A.} and Bottke, {W. F.} and Burke, {K. N.} and Clark, {B. C.} and Daly, {M. G.} and DellaGiustina, {D. N.} and Dworkin, {J. P.} and Elder, {C. M.} and Golish, {D. R.} and Hildebrand, {A. R.} and R. Malhotra and J. Marshall and P. Michel and Nolan, {M. C.} and Perry, {M. E.} and B. Rizk and A. Ryan and Sandford, {S. A.} and Scheeres, {D. J.} and Susorney, {H. C.M.} and F. Thuillet and Lauretta, {D. S.} and Highsmith, {D. E.} and J. Small and D. Vokrouhlick{\'y} and Bowles, {N. E.} and E. Brown and {Donaldson Hanna}, {K. L.} and T. Warren and C. Brunet and Chicoine, {R. A.} and S. Desjardins and D. Gaudreau and {Richar Izawa}, Matthew",
year = "2019",
month = "1",
day = "1",
doi = "10.1038/s41561-019-0326-6",
language = "English",
journal = "Nature Geoscience",
issn = "1752-0894",
publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface

AU - The OSIRIS-REx Team

AU - Walsh, K. J.

AU - Jawin, E. R.

AU - Ballouz, R. L.

AU - Barnouin, O. S.

AU - Bierhaus, E. B.

AU - Connolly, H. C.

AU - Molaro, J. L.

AU - McCoy, T. J.

AU - Delbo’, M.

AU - Hartzell, C. M.

AU - Pajola, M.

AU - Schwartz, S. R.

AU - Trang, D.

AU - Asphaug, E.

AU - Becker, K. J.

AU - Beddingfield, C. B.

AU - Bennett, C. A.

AU - Bottke, W. F.

AU - Burke, K. N.

AU - Clark, B. C.

AU - Daly, M. G.

AU - DellaGiustina, D. N.

AU - Dworkin, J. P.

AU - Elder, C. M.

AU - Golish, D. R.

AU - Hildebrand, A. R.

AU - Malhotra, R.

AU - Marshall, J.

AU - Michel, P.

AU - Nolan, M. C.

AU - Perry, M. E.

AU - Rizk, B.

AU - Ryan, A.

AU - Sandford, S. A.

AU - Scheeres, D. J.

AU - Susorney, H. C.M.

AU - Thuillet, F.

AU - Lauretta, D. S.

AU - Highsmith, D. E.

AU - Small, J.

AU - Vokrouhlický, D.

AU - Bowles, N. E.

AU - Brown, E.

AU - Donaldson Hanna, K. L.

AU - Warren, T.

AU - Brunet, C.

AU - Chicoine, R. A.

AU - Desjardins, S.

AU - Gaudreau, D.

AU - Richar Izawa, Matthew

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where they originate, and thermal or tidal processes act on them once they become near-Earth asteroids. Here we present early measurements of numerous large candidate impact craters on near-Earth asteroid (101955) Bennu by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) mission, which indicate a surface that is between 100 million and 1 billion years old, predating Bennu’s expected duration as a near-Earth asteroid. We also observe many fractured boulders, the morphology of which suggests an influence of impact or thermal processes over a considerable amount of time since the boulders were exposed at the surface. However, the surface also shows signs of more recent mass movement: clusters of boulders at topographic lows, a deficiency of small craters and infill of large craters. The oldest features likely record events from Bennu’s time in the main asteroid belt.

AB - Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where they originate, and thermal or tidal processes act on them once they become near-Earth asteroids. Here we present early measurements of numerous large candidate impact craters on near-Earth asteroid (101955) Bennu by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) mission, which indicate a surface that is between 100 million and 1 billion years old, predating Bennu’s expected duration as a near-Earth asteroid. We also observe many fractured boulders, the morphology of which suggests an influence of impact or thermal processes over a considerable amount of time since the boulders were exposed at the surface. However, the surface also shows signs of more recent mass movement: clusters of boulders at topographic lows, a deficiency of small craters and infill of large craters. The oldest features likely record events from Bennu’s time in the main asteroid belt.

UR - http://www.scopus.com/inward/record.url?scp=85063213424&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063213424&partnerID=8YFLogxK

U2 - 10.1038/s41561-019-0326-6

DO - 10.1038/s41561-019-0326-6

M3 - Article

AN - SCOPUS:85063213424

JO - Nature Geoscience

JF - Nature Geoscience

SN - 1752-0894

ER -