The dynamic geophysical environment of (101955) Bennu based on OSIRIS-REx measurements

被引：129

作者：

Scheeres, D. J. ^{[1
]}

McMahon, J. W. ^{[1
]}

French, A. S. ^{[1
]}

Brack, D. N. ^{[1
]}

Chesley, S. R. ^{[2
]}

Farnocchia, D. ^{[2
]}

Takahashi, Y. ^{[2
]}

Leonard, J. M. ^{[3
]}

Geeraert, J. ^{[3
]}

Page, B. ^{[3
]}

Antreasian, P. ^{[3
]}

Getzandanner, K. ^{[4
]}

Rowlands, D. ^{[4
]}

Mazarico, E. M. ^{[4
]}

Small, J. ^{[5
]}

Highsmith, D. E. ^{[5
]}

Moreau, M. ^{[4
]}

Emery, J. P. ^{[6
]}

Rozitis, B. ^{[7
]}

Hirabayashi, M. ^{[8
]}

Sanchez, P. ^{[9
]}

Van Wal, S. ^{[10
]}

Tricarico, P. ^{[11
]}

Ballouz, R-L ^{[12
]}

Johnson, C. L. ^{[11
,13
]}

Al Asad, M. M. ^{[13
]}

Susorney, H. C. M. ^{[13
]}

Barnouin, O. S. ^{[14
]}

Daly, M. G. ^{[15
]}

Seabrook, J. A. ^{[15
]}

Gaskell, R. W. ^{[11
]}

Palmer, E. E. ^{[11
]}

Weirich, J. R. ^{[11
]}

Walsh, K. J. ^{[16
]}

Jawin, E. R. ^{[17
]}

Bierhaus, E. B. ^{[18
]}

Michel, P. ^{[19
]}

Bottke, W. F. ^{[16
]}

Nolan, M. C. ^{[12
]}

Connolly, H. C., Jr. ^{[20
]}

Lauretta, D. S. ^{[12
]}

Vokrouhlicky, D. ^{[21
]}

Bowles, N. E. ^{[22
]}

Brown, E. ^{[22
]}

Hanna, K. L. Donaldson ^{[22
]}

Warren, T. ^{[22
]}

Brunet, C. ^{[23
]}

Chicoine, R. A. ^{[23
]}

Desjardins, S. ^{[23
]}

Gaudreau, D. ^{[23
]}

机构：

[1] Univ Colorado, Smead Dept Aerosp Engn, Boulder, CO 80309 USA

[2] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA

[3] KinetX Aerosp Inc, Simi Valley, CA USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[5] Aerosp Corp, Chantilly, VA USA

[6] Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN USA

[7] Open Univ, Sch Phys Sci, Milton Keynes, Bucks, England

[8] Auburn Univ, Dept Aerosp Engn, Auburn, AL 36849 USA

[9] Univ Colorado, Colorado Ctr Astrodynam Res, Boulder, CO 80309 USA

[10] JAXA Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[11] Planetary Sci Inst, Tucson, AZ USA

[12] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[13] Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada

[14] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[15] York Univ, Ctr Res Earth & Space Sci, Toronto, ON, Canada

[16] Southwest Res Inst, Boulder, CO USA

[17] Natl Museum Nat Hist, Smithsonian Inst, Washington, DC 20560 USA

[18] Lockheed Martin Space, Littleton, CO USA

[19] Univ Cote dAzur, Observ Cote dAzur, Lab Lagrange, CNRS, Nice, France

[20] Rowan Univ, Dept Geol, Glassboro, NJ USA

[21] Charles Univ Prague, Astron Inst, Prague, Czech Republic

[22] Univ Oxford, Atmospher Ocean & Planetary Phys, Oxford, England

[23] Canadian Space Agcy, St Hubert, PQ, Canada

[24] Catholic Univ Amer, Washington, DC 20064 USA

[25] Harvard Univ, Ctr Astrophys, Cambridge, MA 02138 USA

[26] Arizona State Univ, Ctr Meteorite Studies, Tempe, AZ USA

[27] CUNY, New York, NY 10021 USA

[28] CSIRO, Canberra, ACT, Australia

[29] Univ Maryland, Dept Aerosp Engn, College Pk, MD USA

[30] Univ Arizona, Dept Astron & Steward Observ, Tucson, AZ USA

[31] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[32] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[33] Univ Toronto, Dept Earth Sci, Toronto, ON, Canada

[34] MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[35] Univ Winnipeg, Dept Geog, Winnipeg, MB, Canada

[36] Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78712 USA

[37] Univ Calgary, Dept Geosci, Calgary, AB, Canada

[38] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA

[39] Ithaca Coll, Dept Phys & Astron, Ithaca, NY 14850 USA

[40] No Arizona Univ, Dept Phys & Astron, Flagstaff, AZ 86011 USA

[41] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

[42] Edge Space Syst, Greenbelt, MD USA

[43] Gen Dynam C4 Syst, Denver, CO USA

[44] Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA

[45] Hokkaido Univ, Sapporo, Hokkaido, Japan

[46] Astrophys Observ Arcetri, INAF, Florence, Italy

[47] Osserv Astron Padova, INAF, Padua, Italy

[48] Osserv Astron Roma, INAF, Rome, Italy

[49] Indigo Informat Serv, Tucson, AZ USA

[50] Univ Paris Sud, Inst Astrophys Spatiale, CNRS, Orsay, France

来源：

NATURE ASTRONOMY | 2019年 / 3卷 / 04期

关键词：

ASTEROIDS;

D O I：

10.1038/s41550-019-0721-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The top-shaped morphology characteristic of asteroid (101955) Bennu, often found among fast-spinning asteroids and binary asteroid primaries, may have contributed substantially to binary asteroid formation. Yet a detailed geophysical analysis of this morphology for a fast-spinning asteroid has not been possible prior to the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission. Combining the measured Bennu mass and shape obtained during the Preliminary Survey phase of the OSIRIS-REx mission, we find a notable transition in Bennu's surface slopes within its rotational Roche lobe, defined as the region where material is energetically trapped to the surface. As the intersection of the rotational Roche lobe with Bennu's surface has been most recently migrating towards its equator (given Bennu's increasing spin rate), we infer that Bennu's surface slopes have been changing across its surface within the last million years. We also find evidence for substantial density heterogeneity within this body, suggesting that its interior is a mixture of voids and boulders. The presence of such heterogeneity and Bennu's top shape are consistent with spin-induced failure at some point in its past, although the manner of its failure cannot yet be determined. Future measurements by the OSIRIS-REx spacecraft will provide insight into and may resolve questions regarding the formation and evolution of Bennu's top-shape morphology and its link to the formation of binary asteroids.

引用

页码：352 / 361

页数：10

共 14 条

[1] Orbit and bulk density of the OSIRIS-REx target Asteroid (101955) Bennu
Chesley, Steven R.
Farnocchia, Davide
Nolan, Michael C.
Vokrouhlicky, David
Chodas, Paul W.
Milani, Andrea
Spoto, Federica
Rozitis, Benjamin
Benner, Lance A. M.
Bottke, William F.
Busch, Michael W.
Emery, Joshua P.
Howell, Ellen S.
Lauretta, Dante S.
Margot, Jean-Luc
Taylor, Patrick A.
ICARUS, 2014, 235 : 5 - 22
[2] Thermal infrared observations and thermophysical characterization of OSIRIS-REx target asteroid (101955) Bennu
Emery, J. P.
Fernandez, Y. R.
Kelley, M. S. P.
Warden , K. T.
Hergenrother, C.
Lauretta, D. S.
Drake, M. J.
Campins, H.
Ziffer, J.
ICARUS, 2014, 234 : 17 - 35
[3] Lightcurve, Color and Phase Function Photometry of the OSIRIS-REx Target Asteroid (101955) Bennu
Hergenrother, Carl W.
Nolan, Michael C.
Binzel, Richard P.
Cloutis, Edward A.
Barucci, Maria Antonietta
Michel, Patrick
Scheeres, Daniel J.
d'Aubigny, Christian Drouet
Lazzaro, Daniela
Pinilla-Alonso, Noemi
Campins, Humberto
Licandro, Javier
Clark, Beth E.
Rizk, Bashar
Beshore, Edward C.
Lauretta, Dante S.
ICARUS, 2013, 226 (01) : 663 - 670
[4] Ephemeris and hazard assessment for near-Earth asteroid (101955) Bennu based on OSIRIS-REx data
Farnocchia, Davide
Chesley, Steven R.
Takahashi, Yu
Rozitis, Benjamin
Vokrouhlicky, David
Rush, Brian P.
Mastrodemos, Nickolaos
Kennedy, Brian M.
Park, Ryan S.
Bellerose, Julie
Lubey, Daniel P.
Velez, Dianna
Davis, Alex B.
Emery, Joshua P.
Leonard, Jason M.
Geeraert, Jeroen
Antreasian, Peter G.
Lauretta, Dante S.
ICARUS, 2021, 369
[5] Photometric models of disk-integrated observations of the OSIRIS-REx target Asteroid (101955) Bennu
Takir, Driss
Clark, Beth Ellen
d'Aubigny, Christian Drouet
Hergenrother, Carl W.
Li, Jian-Yang
Lauretta, Dante S.
Binzel, Richard P.
ICARUS, 2015, 252 : 393 - 399
[6] The OSIRIS-REx Radio Science Experiment at Bennu
J. W. McMahon
D. J. Scheeres
S. G. Hesar
D. Farnocchia
S. Chesley
D. Lauretta
Space Science Reviews, 2018, 214
[7] The OSIRIS-REx Radio Science Experiment at Bennu
McMahon, J. W.
Scheeres, D. J.
Hesar, S. G.
Farnocchia, D.
Chesley, S.
Lauretta, D.
SPACE SCIENCE REVIEWS, 2018, 214 (01)
[8] Expected spectral characteristics of (101955) Bennu and (162173) Ryugu, targets of the OSIRIS-REx and Hayabusa2 missions
de Leon, J.
Campins, H.
Morate, D.
De Pra, M.
Ali-Lagoa, V.
Licandro, J.
Rizos, J. L.
Pinilla-Alonso, N.
DellaGiustina, D. N.
Lauretta, D. S.
Popescu, M.
Lorenzi, V.
ICARUS, 2018, 313 : 25 - 37
[9] Shape model and surface properties of the OSIRIS-REx target Asteroid (101955) Bennu from radar and lightcurve observations
Nolan, Michael C.
Magri, Christopher
Howell, Ellen S.
Benner, Lance A. M.
Giorgini, Jon D.
Hergenrother, Carl W.
Hudson, R. Scott
Lauretta, Dante S.
Margot, Jean-Luc
Ostro, Steven J.
Scheeres, Daniel I.
ICARUS, 2013, 226 (01) : 629 - 640
[10] Spectral slope variations for OSIRIS-REx target Asteroid (101955) Bennu: Possible evidence for a fine-grained regolith equatorial ridge
Binzel, Richard P.
DeMeo, Francesca E.
Burt, Brian J.
Cloutis, Edward A.
Rozitis, Ben
Burbine, Thomas H.
Campins, Humberto
Clark, Beth Ellen
Emery, Joshua P.
Hergenrother, Carl W.
Howell, Ellen S.
Lauretta, Dante S.
Nolan, Michael C.
Mansfield, Megan
Pietrasz, Valerie
Polishook, David
Scheeres, Daniel J.
ICARUS, 2015, 256 : 22 - 29

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