Near-zero cohesion and loose packing of Bennu’s near subsurface revealed by spacecraft contact-Reference-Cited by-同舟云学术

Near-zero cohesion and loose packing of Bennu’s near subsurface revealed by spacecraft contact

Published:2022-07-08 Issue:27 Volume:8 Page:
ISSN:2375-2548
Container-title:Science Advances
language:en
Short-container-title:Sci. Adv.

Author:

Walsh Kevin J.¹^ORCID,Ballouz Ronald-Louis²³^ORCID,Jawin Erica R.⁴^ORCID,Avdellidou Chrysa⁵^ORCID,Barnouin Olivier S.³^ORCID,Bennett Carina A.²^ORCID,Bierhaus Edward B.⁶^ORCID,Bos Brent J.⁷,Cambioni Saverio⁸^ORCID,Connolly Harold C.²⁹^ORCID,Delbo Marco⁵^ORCID,DellaGiustina Daniella N.²^ORCID,DeMartini Joseph¹⁰^ORCID,Emery Joshua P.¹¹^ORCID,Golish Dathon R.²^ORCID,Haas Patrick C.⁶,Hergenrother Carl W.²^ORCID,Ma Huikang⁶,Michel Patrick⁵^ORCID,Nolan Michael C.²^ORCID,Olds Ryan⁶,Rozitis Benjamin¹²^ORCID,Richardson Derek C.¹⁰^ORCID,Rizk Bashar²^ORCID,Ryan Andrew J.²^ORCID,Sánchez Paul¹³^ORCID,Scheeres Daniel J.¹³¹⁴^ORCID,Schwartz Stephen R.²¹⁵^ORCID,Selznick Sanford H.¹⁶^ORCID,Zhang Yun⁵^ORCID,Lauretta Dante S.²^ORCID

Affiliation:

1. Southwest Research Institute, Boulder, CO, USA.

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

3. Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA.

4. National Air and Space Museum, Smithsonian Institution, Washington, DC, USA.

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

6. Lockheed Martin Space, Littleton, CO, USA.

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

8. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.

9. Department of Geology, Rowan University, Glassboro, NJ, USA.

10. Department of Astronomy, University of Maryland, College Park, MD, USA.

11. Department of Astronomy and Planetary Science, Northern Arizona University, Flagstaff, AZ, USA.

12. School of Physical Sciences, The Open University, Milton Keynes, UK.

13. Colorado Center for Astrodynamics Research, University of Colorado Boulder, Boulder, CO, USA.

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

15. Planetary Science Institute, Tucson, AZ, USA.

16. Ascending Node Technologies, Tucson, AZ, USA.

Abstract

When the OSIRIS-REx spacecraft pressed its sample collection mechanism into the surface of Bennu, it provided a direct test of the poorly understood near-subsurface physical properties of rubble-pile asteroids, which consist of rock fragments at rest in microgravity. Here, we find that the forces measured by the spacecraft are best modeled as a granular bed with near-zero cohesion that is half as dense as the bulk asteroid. The low gravity of a small rubble-pile asteroid such as Bennu effectively weakens its near subsurface by not compressing the upper layers, thereby minimizing the influence of interparticle cohesion on surface geology. The underdensity and weak near subsurface should be global properties of Bennu and not localized to the contact point.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference63 articles.

1. Spacecraft sample collection and subsurface excavation of asteroid(101955) Bennu;Lauretta D. S.;Science,2022

2. Evidence for widespread hydrated minerals on asteroid (101955) Bennu

3. Widespread carbon-bearing materials on near-Earth asteroid (101955) Bennu

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

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

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