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Main belt binary asteroidal systems with circular mutual orbits

Marchis, F. and Descamps, P. and Baek, M. and Harris, A.W. and Kaasalainen, M. and Berthier, J. and Hestroffer, D. and Vachier, F. (2008) Main belt binary asteroidal systems with circular mutual orbits. Icarus: International Journal of Solar System Studies, 196, pp. 97-118. Elsevier. DOI: 10.1016/j.icarus.2008.03.007.

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-4S50K87-1&_user=100058&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_version=1&_urlVersion=0&_userid=100058&md5=8cbc3a57226ce9452bb3d3b2de9e0d4a

Abstract

In 2003, we initiated a long-term Adaptive Optics campaign to study the orbit of various main-belt asteroidal systems. Here we present a consistent solution for the mutual orbits of four binary systems: 22 Kalliope, 45 Eugenia, 107 Camilla and 762 Pulcova. With the exception of 45 Eugenia, we did not detect any additional satellites around these systems although we have the capability of detecting a loosely-bound fragment (located at 1/4×RHill) that is about 40 times smaller in diameter than the primary. The common characteristic of these mutual orbits is that they are roughly circular. Three of these binary systems belong to a C-“group” taxonomic class. Our estimates of their bulk densities are consistently lower (about 1 g/cm3) than their associated meteorite analogs, suggesting an interior porosity of 30–50% (taking CI-CO meteorites as analogs). 22 Kalliope, a W-type asteroid, has a significantly higher bulk density of about 3 g/cm3, derived based on IRAS radiometric size measurement. We compare the characteristics of these orbits in the light of tidal-effect evolution.

Document Type:Article
Title:Main belt binary asteroidal systems with circular mutual orbits
Authors:
AuthorsInstitution or Email of Authors
Marchis, F.University of California at Berkeley, Department of Astronomy, CA, USA
Descamps, P.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, France
Baek, M.SETI Institute, Carl Sagan Center, CA, USA
Harris, A.W.UNSPECIFIED
Kaasalainen, M.University of Helsinki, Department of Mathematics and Statistics, Finland
Berthier, J.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, France
Hestroffer, D.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, France
Vachier, F.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, France
Date:27 March 2008
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:196
DOI:10.1016/j.icarus.2008.03.007
Page Range:pp. 97-118
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:18 Aug 2008
Last Modified:27 Apr 2009 15:10

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