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Main belt binary asteroidal systems with eccentric mutual orbits

Marchis, Franck and Descamps, Pascal and Berthier, Jerome and Hestroffer, Daniel and Vachier, Frédéric and Baek, M and Harris, Alan and Nesvorny, David (2008) Main belt binary asteroidal systems with eccentric mutual orbits. Icarus: International Journal of Solar System Studies, 195, pp. 295-316. Elsevier. DOI: doi:10.1016/j.icarus.2007.12.010.

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Official URL: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WGF-4RJ9X6R-1-J&_cdi=6821&_user=100058&_orig=search&_coverDate=05%2F31%2F2008&_sk=998049998&view=c&wchp=dGLbVlz-zSkWb&md5=cf5de8b462de17e22670e7bc39f84ea7&ie=/sdarticle.pdf

Abstract

Using 8–10-m class telescopes and their Adaptive Optics (AO) systems, we conducted a long-term adaptive optics campaign initiated in 2003 focusing on four binary asteroid systems: (130) Elektra, (283) Emma, (379) Huenna, and (3749) Balam. The analysis of these data confirms the presence of their asteroidal satellites. We did not detect any additional satellites around these systems even though we have the capability of detecting a loosely-bound fragment (located at 1/4×RHill) about 40 times smaller in diameter than the primary. The orbits derived for their satellites display significant eccentricity, ranging from 0.1 to 0.9, suggesting a different origin. Based on AO size estimate, we show that (130) Elektra and (283) Emma, G-type and P-type asteroids, respectively, have a significant porosity (30–60% considering CI-CO meteorites as analogs) and their satellite's eccentricities (e around 0.1) are possibly due to excitation by tidal effects. (379) Huenna and (3749) Balam, two loosely bound binary systems, are most likely formed by mutual capture. (3749) Balam's possible high bulk density is similar to (433) Eros, another S-type asteroid, and should be poorly fractured as well. (379) Huenna seems to display both characteristics: the moonlet orbits far away from the primary in term of stability (20%×RHill), but the primary's porosity is significant (30–60%).

Document Type:Article
Title:Main belt binary asteroidal systems with eccentric mutual orbits
Authors:
AuthorsInstitution or Email of Authors
Marchis, FranckUniversity of California at Berkeley, Department of Astronomy
Descamps, PascalInstitut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris
Berthier, JeromeInstitut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris
Hestroffer, DanielInstitut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris
Vachier, FrédéricInstitut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris
Baek, MSETI Institute, Carl Sagan Center, CA, USA
Harris, AlanUNSPECIFIED
Nesvorny, DavidSouthwest Research Institute, Boulder, USA
Date:May 2008
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:195
DOI:doi:10.1016/j.icarus.2007.12.010
Page Range:pp. 295-316
Editors:
EditorsEmail
American Astronomical Society, UNSPECIFIED
Publisher:Elsevier
Status:Published
Keywords:Asteroids, Adaptive Optics, Orbit determination
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Prof. Alan Harris
Deposited On:09 Jun 2008
Last Modified:27 Apr 2009 14:57

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