Binary Asteroids in the Near-Earth Object Population-Reference-Cited by-同舟云学术

Binary Asteroids in the Near-Earth Object Population

Published:2002-05-24 Issue:5572 Volume:296 Page:1445-1448
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Margot J. L.¹,Nolan M. C.²,Benner L. A. M.³,Ostro S. J.³,Jurgens R. F.³,Giorgini J. D.³,Slade M. A.³,Campbell D. B.⁴

Affiliation:

1. California Institute of Technology, MC 150-21, Pasadena, CA 91125, USA.

2. National Astronomy and Ionosphere Center, Arecibo, Puerto Rico 00612.

3. Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.

4. Space Sciences Building, Cornell University, Ithaca, NY 14853, USA.

Abstract

Radar images of near-Earth asteroid 2000 DP107 show that it is composed of an ∼800-meter-diameter primary and an ∼300-meter-diameter secondary revolving around their common center of mass. The orbital period of 1.755 ± 0.007 days and semimajor axis of 2620 ± 160 meters constrain the total mass of the system to 4.6 ± 0.5 × 10 11 kilograms and the bulk density of the primary to 1.7 ± 1.1 grams per cubic centimeter. This system and other binary near-Earth asteroids have spheroidal primaries spinning near the breakup point for strengthless bodies, suggesting that the binaries formed by spin-up and fission, probably as a result of tidal disruption during close planetary encounters. About 16% of near-Earth asteroids larger than 200 meters in diameter may be binary systems.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference56 articles.

1. Discovery and physical properties of Dactyl, a satellite of asteroid 243 Ida

2. W. J. Merline et al. in a survey of 300 main-belt asteroids detected 6 asteroid satellites 4 of which were previously undiscovered (46–48).

3. J. L. Margot and M. E. Brown in a survey that has sampled 100 main-belt asteroids so far discovered satellites to asteroids 87 Sylvia (49) and 22 Kalliope (50).

4. In the rest of this report we refer to the larger component as “primary ” to the smaller component as “secondary” or “satellite ” and to both components collectively as “binary asteroid.” The terminology is not without its limitations. In many cases it may not be clear which one is the larger or more massive component and hence which one is the satellite. In other cases the status of “binary asteroid” would have to be upgraded to “triple asteroid” if another satellite was discovered. The first companion discovered around an asteroid with provisional designation 2000 DP107 receives the provisional designation “S/2000 (2000 DP107) 1” if discovered in the year 2000. A second hypothetical companion discovered in 2002 would receive the provisional designation “S/2002 (2000 DP107) 2.”

5. Doublet craters and the tidal disruption of binary asteroids

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