Hemispherical differences in the shape and topography of asteroid (101955) Bennu
AuthorDaly, M G
Barnouin, O S
Seabrook, J A
Walsh, K J
Jawin, E R
Palmer, E E
Perry, M E
Al Asad, M M
Johnson, C L
Adam, C D
Leonard, J M
Geeraert, J L
Nolan, M C
Daly, R T
Bierhaus, E B
Ryan, A J
DellaGiustina, D N
Susorney, H C M
Enos, H L
Lauretta, D S
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherAMER ASSOC ADVANCEMENT SCIENCE
CitationDaly, M. G., Barnouin, O. S., Seabrook, J. A., Roberts, J., Dickinson, C., Walsh, K. J., ... & Lauretta, D. S. (2020). Hemispherical differences in the shape and topography of asteroid (101955) Bennu. Science Advances, 6(41), eabd3649.
RightsCopyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe investigate the shape of near-Earth asteroid (101955) Bennu by constructing a high-resolution (20 cm) global digital terrain model from laser altimeter data. By modeling the northern and southern hemispheres separately, we find that longitudinal ridges previously identified in the north extend into the south but are obscured there by surface material. In the south, more numerous large boulders effectively retain surface materials and imply a higher average strength at depth to support them. The north has fewer large boulders and more evidence of boulder dynamics (toppling and downslope movement) and surface flow. These factors result in Bennu's southern hemisphere being rounder and smoother, whereas its northern hemisphere has higher slopes and a less regular shape. We infer an originally asymmetric distribution of large boulders followed by a partial disruption, leading to wedge formation in Bennu's history.
NoteOpen access journal
VersionFinal published version
Except where otherwise noted, this item's license is described as Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).
- Bennu's near-Earth lifetime of 1.75 million years inferred from craters on its boulders.
- Authors: Ballouz RL, Walsh KJ, Barnouin OS, DellaGiustina DN, Asad MA, Jawin ER, Daly MG, Bottke WF, Michel P, Avdellidou C, Delbo M, Daly RT, Asphaug E, Bennett CA, Bierhaus EB, Connolly HC Jr, Golish DR, Molaro JL, Nolan MC, Pajola M, Rizk B, Schwartz SR, Trang D, Wolner CWV, Lauretta DS
- Issue date: 2020 Nov
- The dynamic geophysical environment of (101955) Bennu based on OSIRIS-REx measurements.
- Authors: Scheeres DJ, McMahon JW, French AS, Brack DN, Chesley SR, Farnocchia D, Takahashi Y, Leonard JM, Geeraert J, Page B, Antreasian P, Getzandanner K, Rowlands D, Mazarico E, Small J, Highsmith DE, Moreau M, Emery JP, Rozitis B, Hirabayashi M, Sánchez P, Wal SV, Tricarico P, Ballouz RL, Johnson CL, Asad MMA, Susorney HCM, Barnouin OS, Daly MG, Seabrook J, Gaskell RW, Palmer EE, Weirich JR, Walsh KJ, Jawin ER, Bierhaus EB, Michel P, Bottke WF, Nolan MC, Connolly HC Jr, Lauretta DS, OSIRIS-REx Team.
- Issue date: 2019 Apr
- Asteroid (101955) Bennu's weak boulders and thermally anomalous equator.
- Authors: Rozitis B, Ryan AJ, Emery JP, Christensen PR, Hamilton VE, Simon AA, Reuter DC, Al Asad M, Ballouz RL, Bandfield JL, Barnouin OS, Bennett CA, Bernacki M, Burke KN, Cambioni S, Clark BE, Daly MG, Delbo M, DellaGiustina DN, Elder CM, Hanna RD, Haberle CW, Howell ES, Golish DR, Jawin ER, Kaplan HH, Lim LF, Molaro JL, Munoz DP, Nolan MC, Rizk B, Siegler MA, Susorney HCM, Walsh KJ, Lauretta DS
- Issue date: 2020 Oct
- Widespread carbon-bearing materials on near-Earth asteroid (101955) Bennu.
- Authors: Simon AA, Kaplan HH, Hamilton VE, Lauretta DS, Campins H, Emery JP, Barucci MA, DellaGiustina DN, Reuter DC, Sandford SA, Golish DR, Lim LF, Ryan A, Rozitis B, Bennett CA
- Issue date: 2020 Nov 6
- Shape of (101955) Bennu indicative of a rubble pile with internal stiffness.
- Authors: Barnouin OS, Daly MG, Palmer EE, Gaskell RW, Weirich JR, Johnson CL, Asad MMA, Roberts JH, Perry ME, Susorney HCM, Daly RT, Bierhaus EB, Seabrook JA, Espiritu RC, Nair AH, Nguyen L, Neumann GA, Ernst CM, Boynton WV, Nolan MC, Adam CD, Moreau MC, Risk B, D'Aubigny CD, Jawin ER, Walsh KJ, Michel P, Schwartz SR, Ballouz RL, Mazarico EM, Scheeres DJ, McMahon J, Bottke W, Sugita S, Hirata N, Hirata N, Watanabe S, Burke KN, DellaGuistina DN, Bennett CA, Lauretta DS, OSIRIS-REx Team.
- Issue date: 2019 Apr