Shape of (101955) Bennu indicative of a rubble pile with internal stiffness.

Journal

Nature geoscience
ISSN: 1752-0894
Titre abrégé: Nat Geosci
Pays: England
ID NLM: 101482213

Informations de publication

Date de publication:
Apr 2019
Historique:
entrez: 14 5 2019
pubmed: 14 5 2019
medline: 14 5 2019
Statut: ppublish

Résumé

The shapes of asteroids reflect interplay between their interior properties and the processes responsible for their formation and evolution as they journey through the Solar System. Prior to the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) mission, Earth-based radar imaging gave an overview of (101955) Bennu's shape. Here, we construct a high-resolution shape model from OSIRIS-REx images. We find that Bennu's top-like shape, considerable macroporosity, and prominent surface boulders suggest that it is a rubble pile. High-standing, north-south ridges that extend from pole to pole, many long grooves, and surface mass wasting indicate some low levels of internal friction and/or cohesion. Our shape model indicates that, similar to other top-shaped asteroids, Bennu formed by reaccumulation and underwent past periods of fast spin leading to its current shape. Today, Bennu might follow a different evolutionary pathway, with interior stiffness permitting surface cracking and mass wasting.

Identifiants

DOI: 10.1038/s41561-019-0330-x PMID: 31080497 PMC: PMC6505705
pubmed: 31080497
doi: 10.1038/s41561-019-0330-x
pmc: PMC6505705
mid: NIHMS1521958
doi:

Types de publication

Journal Article

Langues

eng

Pagination

247-252

Subventions

Organisme : Intramural NASA
ID : NNM10AA11C
Pays : United States

Références

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pubmed: 32025061

Auteurs

O S Barnouin (OS)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

M G Daly (MG)

The Centre for Research in Earth and Space Science, York University, Toronto, Ontario, Canada.

E E Palmer (EE)

Planetary Science Institute, Tucson, AZ, USA.

R W Gaskell (RW)

Planetary Science Institute, Tucson, AZ, USA.

J R Weirich (JR)

Planetary Science Institute, Tucson, AZ, USA.

C L Johnson (CL)

Planetary Science Institute, Tucson, AZ, USA.
Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada.

M M Al Asad (MMA)

Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada.

J H Roberts (JH)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

M E Perry (ME)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

H C M Susorney (HCM)

Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada.

R T Daly (RT)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

E B Bierhaus (EB)

Lockheed Martin Space Systems Company, Denver, CO, USA.

J A Seabrook (JA)

Planetary Science Institute, Tucson, AZ, USA.

R C Espiritu (RC)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

A H Nair (AH)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

L Nguyen (L)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

G A Neumann (GA)

NASA Goddard Space Flight Center, Greenbelt, MD, USA.

C M Ernst (CM)

The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA (olivier.barnouin@jhuapl.edu).

W V Boynton (WV)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

M C Nolan (MC)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

C D Adam (CD)

KinetX Aerospace, Inc. Simi Valley, CA, USA.

M C Moreau (MC)

NASA Goddard Space Flight Center, Greenbelt, MD, USA.

B Risk (B)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

C Drouet D'Aubigny (CD)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

E R Jawin (ER)

Smithsonian Institution National Museum of Natural History, Washington, DC, USA.

K J Walsh (KJ)

Southwest Research Institute, Boulder, CO, USA.

P Michel (P)

Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France.

S R Schwartz (SR)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

R-L Ballouz (RL)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

E M Mazarico (EM)

NASA Goddard Space Flight Center, Greenbelt, MD, USA.

D J Scheeres (DJ)

Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.

J McMahon (J)

Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.

W Bottke (W)

Southwest Research Institute, Boulder, CO, USA.

S Sugita (S)

University of Tokyo, Tokyo, Japan.

N Hirata (N)

Aizu University, Aizu-Wakamatsu, Japan.

N Hirata (N)

Kobe University, Kobe, Japan.

S Watanabe (S)

Nagoya University, Nagoya, Japan.
Institute of Space and Astronautical Science, JAXA, Sagamihara, Japan.

K N Burke (KN)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

D N DellaGuistina (DN)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

C A Bennett (CA)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

D S Lauretta (DS)

Lunar Planetary Laboratory, University of Arizona, Tucson, AZ, USA.

Classifications MeSH