A contact binary satellite of the asteroid (152830) Dinkinesh

被引：11

作者：

Levison, Harold F. ^{[1
]}

Marchi, Simone ^{[1
]}

Noll, Keith S. ^{[2
]}

Spencer, John R. ^{[1
]}

Statler, Thomas S. ^{[3
]}

Bell, James F. ^{[4
]}

Bierhaus, Edward B. ^{[5
]}

Binzel, Richard ^{[6
]}

Bottke, William F. ^{[1
]}

Britt, Daniel ^{[7
]}

Brown, Michael E. ^{[8
]}

Buie, Marc W. ^{[1
]}

Christensen, Philip R. ^{[4
]}

Dello Russo, Neil ^{[9
]}

Emery, Joshua P. ^{[10
]}

Grundy, William M. ^{[10
,11
]}

Hahn, Matthias ^{[12
]}

Hamilton, Victoria E. ^{[1
]}

Howett, Carly ^{[13
]}

Kaplan, Hannah ^{[2
]}

Kretke, Katherine ^{[1
]}

Lauer, Tod R. ^{[14
]}

Manzoni, Claudia ^{[15
]}

Marschall, Raphael ^{[16
]}

Martin, Audrey C. ^{[7
]}

May, Brian H. ^{[15
]}

Mottola, Stefano ^{[17
]}

Olkin, Catherine B. ^{[18
]}

Paetzold, Martin ^{[12
]}

Parker, Joel Wm. ^{[1
]}

Porter, Simon ^{[1
]}

Preusker, Frank ^{[17
]}

Protopapa, Silvia ^{[1
]}

Reuter, Dennis C. ^{[2
]}

Robbins, Stuart J. ^{[1
]}

Salmon, Julien ^{[1
]}

Simon, Amy A. ^{[2
]}

Stern, S. Alan ^{[1
]}

Sunshine, Jessica M. ^{[19
]}

Wong, Ian ^{[2
,20
]}

Weaver, Harold A. ^{[9
]}

Adam, Coralie ^{[21
]}

Ancheta, Shanti ^{[5
]}

Andrews, John ^{[1
]}

Anwar, Saadat ^{[4
]}

Barnouin, Olivier S. ^{[9
]}

Beasley, Matthew ^{[1
]}

Berry, Kevin E. ^{[2
]}

Birath, Emma ^{[1
]}

Bolin, Bryce ^{[2
]}

机构：

[1] Southwest Res Inst, Boulder, CO 80302 USA

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

[3] NASA Headquarters, Washington, DC USA

[4] Arizona State Univ, Tempe, AZ USA

[5] Lockheed Martin Space, Littleton, CO USA

[6] MIT, Cambridge, MA USA

[7] Univ Cent Florida, Orlando, FL USA

[8] CALTECH, Pasadena, CA USA

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

[10] No Arizona Univ, Flagstaff, AZ USA

[11] Lowell Observ, Flagstaff, AZ USA

[12] Univ Cologne, Rhein Inst Umweltforsch, Cologne, Germany

[13] Univ Oxford, Oxford, England

[14] NSFs Natl Opt Infrared Astron Res Lab, Tucson, AZ USA

[15] London Stereoscop Co, London, England

[16] CNRS, Observ Cote Azur, Lab JL Lagrange, Nice, France

[17] DLR Inst Planetary Res, Berlin, Germany

[18] Muon Space, Mountain View, CA USA

[19] Univ Maryland, College Pk, MD USA

[20] Amer Univ, Washington, DC USA

[21] KinetX Space Nav & Flight Dynam Practice, Simi Valley, CA USA

[22] Indigo Informat Serv, Tucson, AZ USA

[23] Red Canyon Software, Denver, CO USA

[24] Cornell Univ, Ithaca, NY USA

[25] Marshall Space Flight Ctr, Huntsville, AL USA

[26] Lauffer Space Engn, Littleton, CO USA

[27] Teton Cyber Technol, Littleton, CO USA

[28] Rochester Inst Technol, Rochester, NY USA

[29] Stellar Solut, Denver, CO USA

[30] Big Head Endian, Burden, KS USA

来源：

NATURE | 2024年 / 629卷 / 8014期

关键词：

POPULATION; DYNAMICS;

D O I：

10.1038/s41586-024-07378-0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Asteroids with diameters less than about 5 km have complex histories because they are small enough for radiative torques (that is, YORP, short for the Yarkovsky-O'Keefe-Radzievskii-Paddack effect) 1 to be a notable factor in their evolution 2 . (152830) Dinkinesh is a small asteroid orbiting the Sun near the inner edge of the main asteroid belt with a heliocentric semimajor axis of 2.19 au; its S-type spectrum 3,4 is typical of bodies in this part of the main belt 5 . Here we report observations by the Lucy spacecraft 6,7 as it passed within 431 km of Dinkinesh. Lucy revealed Dinkinesh, which has an effective diameter of only 720 m, to be unexpectedly complex. Of particular note is the presence of a prominent longitudinal trough overlain by a substantial equatorial ridge and the discovery of the first confirmed contact binary satellite, now named (152830) Dinkinesh I Selam. Selam consists of two near-equal-sized lobes with diameters of 210 m and 230 m. It orbits Dinkinesh at a distance of 3.1 km with an orbital period of about 52.7 h and is tidally locked. The dynamical state, angular momentum and geomorphologic observations of the system lead us to infer that the ridge and trough of Dinkinesh are probably the result of mass failure resulting from spin-up by YORP followed by the partial reaccretion of the shed material. Selam probably accreted from material shed by this event. Observations from the Lucy spacecraft of the small main-belt asteroid (152830) Dinkinesh reveals unexpected complexity, with a longitudinal trough and equatorial ridge, as well as the discovery of the first contact binary satellite.

引用

页码：1015 / 1020

页数：9

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