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New determination of the size and bulk density of the binary Asteroid 22 Kalliope from observations of mutual eclipses

Descamps, P. and Marchis, F. and Pollock, J. and Berthier, J. and Vachier, F. and Birlan, M. and Kaasalainen, M. and Harris, A.W. and Wong, M.H. and Romanishin, W.J. and Cooper, E.M. and Kettner, K.A. and Wiggins, P. and Kryszczynska, A. and Polinska, M. and Coliac, J.-F. and Devyatkin, A. and Verestchagina, I. and Gorshanov, D (2008) New determination of the size and bulk density of the binary Asteroid 22 Kalliope from observations of mutual eclipses. Icarus: International Journal of Solar System Studies, 196, pp. 578-600. Elsevier. DOI: 10.1016/j.icarus.2008.03.014.

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-4S5FJH6-4&_user=100058&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_version=1&_urlVersion=0&_userid=100058&md5=554a97551efbe219e5bdadddbfe700ca

Abstract

In 2007, the M-type binary Asteroid 22 Kalliope reached one of its annual equinoxes. As a consequence, the orbit plane of its small moon, Linus, was aligned closely to the Sun's line of sight, giving rise to a mutual eclipse season. A dedicated international campaign of photometric observations, based on amateur–professional collaboration, was organized and coordinated by the IMCCE in order to catch several of these events. The set of the compiled observations is released in this work. We developed a relevant model of these events, including a topographic shape model of Kalliope refined in the present work, the orbit solution of Linus as well as the photometric effect of the shadow of one component falling on the other. By fitting this model to the only two full recorded events, we derived a new estimation of the equivalent diameter of Kalliope of 166.2±2.8 km, 8% smaller than its IRAS diameter. As to the diameter of Linus, considered as purely spherical, it is estimated to 28±2 km. This substantial “shortening” of Kalliope, gives a bulk density of 3.35±0.33 g/cm3, significantly higher than past determinations but more consistent with its taxonomic type. Some constraints can be inferred on the composition.

Document Type:Article
Title:New determination of the size and bulk density of the binary Asteroid 22 Kalliope from observations of mutual eclipses
Authors:
AuthorsInstitution or Email of Authors
Descamps, P.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris
Marchis, F.University of California at Berkeley, Department of Astronomy, USA
Pollock, J.Appalachian State University, Department of Physics and Astronomy, NC, USA
Berthier, J.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
Birlan, M.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, France
Kaasalainen, M.University of Helsinki, Department of Mathematics and Statistics, Finland
Harris, A.W.UNSPECIFIED
Wong, M.H.University of California at Berkeley, Department of Astronomy, USA
Romanishin, W.J.University of Oklahoma, Department of Physics and Astronomy, USA
Cooper, E.M.University of Oklahoma, Department of Physics and Astronomy, USA
Kettner, K.A.University of Oklahoma, Department of Physics and Astronomy, USA
Wiggins, P.Wiggins Observatory, USA
Kryszczynska, A.Central Astronomical Observatory, St. Petersburg, Russia
Polinska, M.Central Astronomical Observatory, St. Petersburg, Russia
Coliac, J.-F.Observatoire de la Farigourette, Marseille, France)
Devyatkin, A.SETI Institute, CA, USA
Verestchagina, I.SETI Institute, CA, USA
Gorshanov, DSETI Institute, CA, USA
Date:29 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.2008.03.014
Page Range:pp. 578-600
Editors:
EditorsEmail
American Astronomical Society, UNSPECIFIED
Publisher:Elsevier
Status:Published
Keywords:Asteroids, Asteroid surfaces, Satellites of asteroids, Eclipses, Photometry
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 13:11

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