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
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.
|Title:||New determination of the size and bulk density of the binary Asteroid 22 Kalliope from observations of mutual eclipses|
|Date:||29 March 2008|
|Journal or Publication Title:||Icarus: International Journal of Solar System Studies|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 578-600|
|Keywords:||Asteroids, Asteroid surfaces, Satellites of asteroids, Eclipses, Photometry|
|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:||18 Aug 2008|
|Last Modified:||27 Apr 2009 13:11|
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