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Characteristics and large bulk density of the C-type main-belt triple asteroid (93) Minerva

Marchis, F. and Vachier, F. and Durech, J. and Enriquez, J.E. and Harris, A.W. and Dalba, P.A. and Berthier, J. and Emery, J.P. and Bouy, H. and Melbourne, J. and Stockton, A. and Fassnacht, C.D. and Dupuy, T.J. and Strajnic, J. (2013) Characteristics and large bulk density of the C-type main-belt triple asteroid (93) Minerva. Icarus: International Journal of Solar System Studies, 224, pp. 178-191. Elsevier. DOI: 10.1016/j.icarus.2013.02.018 ISSN 0019-1035

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Official URL: http://dx.doi.org/10.1016/j.icarus.2013.02.018

Abstract

From a set of adaptive optics (AO) observations collected with the W.M. Keck telescope between August and September 2009, we derived the orbital parameters of the most recently discovered satellites of the large C-type asteroid (93) Minerva. The satellites of Minerva, which are approximately 3 and 4 km in diameter, orbit very close to the primary (~5 and ~8 x Rp and ~1% and ~2% x RHill) in a circular manner, sharing common characteristics with most of the triple asteroid systems in the main-belt. Combining these AO observations with lightcurve data collected since 1980 and two stellar occultations in 2010 and 2011, we removed the ambiguity of the pole solution of Minerva’s primary and showed that it has an almost regular shape with an equivalent diameter Deq = 154 ± 6 km in agreement with IRAS observations. The surprisingly high bulk density of 1.75 ± 0.30 g/cm3 for this C-type asteroid, suggests that this taxonomic class is composed of asteroids with different compositions. For instance, Minerva could be made of the same material as dry CR, CO, and CV meteorites. We discuss possible scenarios on the origin of the system and conclude that future observations may shine light on the nature and composition of this fifth known triple main-belt asteroid.

Item URL in elib:https://elib.dlr.de/83248/
Document Type:Article
Title:Characteristics and large bulk density of the C-type main-belt triple asteroid (93) Minerva
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Marchis, F.Carl Sagan Center at the SETI Institute, 189 Bernardo Av., Mountain View, CA 94043, USAUNSPECIFIED
Vachier, F.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, FranceUNSPECIFIED
Durech, J.Astronomical Institute, Charles University in Prague, Faculty of Mathematics and Physics, V Holesovickach 2, 18000 Prague, Czech RepublicUNSPECIFIED
Enriquez, J.E.University of California at Berkeley, Department of Astronomy, B-20 Hearst Field Annex #3411, Berkeley, CA 94720, USAUNSPECIFIED
Harris, A.W.alan.harris (at) dlr.deUNSPECIFIED
Dalba, P.A.Carl Sagan Center at the SETI Institute, 189 Bernardo Av., Mountain View, CA 94043, USAUNSPECIFIED
Berthier, J.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, FranceUNSPECIFIED
Emery, J.P.University of Tenessee, 306 EPS Building, 1412 Circle Drive, Knoxville, TN 37996, USAUNSPECIFIED
Bouy, H.Centro de Astrobiología, INTA-CSIC, PO Box 78, 28691 Villanueva de la Cañada,Madrid, SpainUNSPECIFIED
Melbourne, J.California Institute of Technology, MS 301-17, Pasadena, CA 91125, USAUNSPECIFIED
Stockton, A.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USAUNSPECIFIED
Fassnacht, C.D.Department of Physics, University of California Davis, 1 Shields Avenue, Davis, CA 95616, USAUNSPECIFIED
Dupuy, T.J.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USAUNSPECIFIED
Strajnic, J.Direction de l’enseignement supérieur et de la recherche, Rectorat d’Aix-Marseille, Place Lucien Paye, 13100 Aix-en-Provence, FranceUNSPECIFIED
Date:2013
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:224
DOI :10.1016/j.icarus.2013.02.018
Page Range:pp. 178-191
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Asteroids, Satellites of asteroids, Adaptive optics, Orbit determination, Interiors
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Harris, Prof. Alan
Deposited On:17 Sep 2013 10:57
Last Modified:17 Sep 2013 10:57

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