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1826201905840259072
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| author2 |
MIT Kavli Institute for Astrophysics and Space Research
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MIT Kavli Institute for Astrophysics and Space Research
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MIT
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| description |
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, which led to its current shape. Today, Bennu might follow a different evolutionary pathway, with an interior stiffness that permits surface cracking and mass wasting. ©2019
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2024-09-23T11:58:43Z
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Article
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mit-1721.1/124550
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| institution |
Massachusetts Institute of Technology
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| language |
English
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2024-09-23T11:58:43Z
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2020
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Springer Science and Business Media LLC
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dspace
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| spelling |
mit-1721.1/1245502022-10-01T07:25:03Z Shape of (101955) Bennu indicative of a rubble pile with internal stiffness MIT Kavli Institute for Astrophysics and Space Research 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, which led to its current shape. Today, Bennu might follow a different evolutionary pathway, with an interior stiffness that permits surface cracking and mass wasting. ©2019 2020-04-08T19:11:42Z 2020-04-08T19:11:42Z 2019-04 2019-03 2020-04-03T18:02:55Z Article http://purl.org/eprint/type/JournalArticle 1752-0908 1752-0894 https://hdl.handle.net/1721.1/124550 Barnouin, O.S., et al., "Shape of (101955) Bennu indicative of a rubble pile with internal stiffness." Nature geoscience 12, 4 (April 2019): p. 247-52 doi 10.1038/s41561-019-0330-x ©2019 Author(s) en 10.1038/s41561-019-0330-x Nature geoscience Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Springer Science and Business Media LLC PMC
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| spellingShingle |
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
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| title |
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
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| title_full |
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
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| title_fullStr |
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
|
| title_full_unstemmed |
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
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| title_short |
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
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| title_sort |
shape of 101955 bennu indicative of a rubble pile with internal stiffness
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| url |
https://hdl.handle.net/1721.1/124550
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