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
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%).
|Title:||Main belt binary asteroidal systems with eccentric mutual orbits|
|Journal or Publication Title:||Icarus: International Journal of Solar System Studies|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 295-316|
|Keywords:||Asteroids, Adaptive Optics, Orbit determination|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|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)|
|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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