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New insights on the binary Asteroid 121 Hermione

Descamps, P. and Marchis, F. and Durech, J. and Emery, J. and Harris, A.W. and Kaasalainen, M. and Berthier, J. and Teng-Chuen-Yu, J.-P. and Peyrot, A. and Hutton, L. and Greene, J. and Pollock, J. and Assafin, M. and Vieiera-Martins, R. and Camargo, J.I.B. and Braga-Ribas, F. and Vachier, F. and Reichart, D.E. and Ivarsen, K.M. and Crain, J.A. and Nysewander, M.C. and Lacluyze, A.P. and Haislip, J.B. and Behrend, R. and Colas, F. and Lecacheux, J. and Bernasconi, L. and Roy, R. and Baudouin, P. and Brunetto, L. and Sposetti, S. and Manzini, F. (2009) New insights on the binary Asteroid 121 Hermione. Icarus: International Journal of Solar System Studies, 203, pp. 88-101. Elsevier. DOI: 10.1016/j.icarus.2009.04.032.

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Official URL: http://www.elsevier.com/locate/icarus

Abstract

We report on the results of a 6-month photometric study of the main-belt binary C-type Asteroid 121 Hermione, performed during its 2007 opposition. We took advantage of the rare observational opportunity afforded by one of the annual equinoxes of Hermione occurring close to its opposition in June 2007. The equinox provides an edge-on aspect for an Earth-based observer, which is well suited to a thorough study of Hermione’s physical characteristics. The catalog of observations carried out with small telescopes is presented in this work, together with new adaptive optics (AO) imaging obtained between 2005 and 2008 with the Yepun 8-m VLT telescope and the 10-m Keck telescope. The most striking result is confirmation that Hermione is a bifurcated and elongated body, as suggested by Marchis, et al. [Marchis, F., Hestroffer, D., Descamps, P., Berthier, J., Laver, C., de Pater, I., 2005. Icarus 178, 450–464]. A new effective diameter of 187 ± 6 km was calculated from the combination of AO, photometric and thermal observations. The new diameter is some 10% smaller than the hitherto accepted radiometric diameter based on IRAS data. The reason for the discrepancy is that IRAS viewed the system almost pole-on. New thermal observations with the Spitzer Space Telescope agree with the diameter derived from AO and lightcurve observations. On the basis of the new AO astrometric observations of the small 32-km diameter satellite we have refined the orbit solution and derived a new value of the bulk density of Hermione of 1.4 + 0.5/-0.2 g cm-3. We infer a macroscopic porosity of ~33 + 5/-20%.

Document Type:Article
Title:New insights on the binary Asteroid 121 Hermione
Authors:
AuthorsInstitution or Email of Authors
Descamps, P.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, France
Marchis, F.University of California at Berkeley, Department of Astronomy, 601 Campbell Hall, Berkeley, CA 94720, USA
Durech, J.Astronomical Institute, Charles University in Prague, Faculty of Mathematics and Physics, V Holesovickach 2, 18000 Prague, Czech Republic
Emery, J.University of Tenessee, 306 EPS Building, 1412 Circle Drive, Knoxville, TN 37996, USA
Harris, A.W.UNSPECIFIED
Kaasalainen, M.Department of Mathematics and Statistics, Gustaf Hallstromin katu 2b, P.O. Box 68, FIN-00014 University of Helsinki, Finland
Berthier, J.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, France
Teng-Chuen-Yu, J.-P.Makes Observatory, 18, rue G. Bizet – Les Makes – 97421 La Rivière, France
Peyrot, A.Makes Observatory, 18, rue G. Bizet – Les Makes – 97421 La Rivière, France
Hutton, L.Appalachian State University, Department of Physics and Astronomy, 231 CAP Building, Boone, NC 28608, USA
Greene, J.Appalachian State University, Department of Physics and Astronomy, 231 CAP Building, Boone, NC 28608, USA
Pollock, J.Appalachian State University, Department of Physics and Astronomy, 231 CAP Building, Boone, NC 28608, USA
Assafin, M.Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, 20080-090 Rio de Janeiro, Brazil
Vieiera-Martins, R.Observatório Nacional, Rua General Jose Cristino 77, 20921-400 Rio de Janeiro, Brazil
Camargo, J.I.B.Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, 20080-090 Rio de Janeiro, Brazil
Braga-Ribas, F.Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, 20080-090 Rio de Janeiro, Brazil
Vachier, F.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, France
Reichart, D.E.University of North Carolina, Chapel Hill, NC 27514, USA
Ivarsen, K.M.University of North Carolina, Chapel Hill, NC 27514, USA
Crain, J.A.University of North Carolina, Chapel Hill, NC 27514, USA
Nysewander, M.C.University of North Carolina, Chapel Hill, NC 27514, USA
Lacluyze, A.P.University of North Carolina, Chapel Hill, NC 27514, USA
Haislip, J.B.University of North Carolina, Chapel Hill, NC 27514, USA
Behrend, R.Geneva Observatory, 1290 Sauverny, Switzerland
Colas, F.Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, UMR8028 CNRS, 77 av. Denfert-Rochereau, 75014 Paris, France
Lecacheux, J.Observatoire de Paris, LESIA, 5, Place Jules Janssen, 92195 Meudon Cedex, France
Bernasconi, L.Les Engarouines Observatory, 84570 Mallemort-du-Comtat, France
Roy, R.Blauvac Observatory, 84570 St-Estève, France
Baudouin, P.Harfleur Observatory, 51 Rue Robert Ancel, 76700 Harfleur, France
Brunetto, L.‘‘Le Florian”, Villa 4, 880 chemin de Ribac-Estagnol, 06600 Antibes, France
Sposetti, S.Gnosca Observatory, 6525 Gnosca, Switzerland
Manzini, F.Stazione Astronomica di Sozzago, 28060 Sozzago, Italy
Date:May 2009
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:203
DOI:10.1016/j.icarus.2009.04.032
Page Range:pp. 88-101
Publisher:Elsevier
Status:Published
Keywords:Asteroids: rotation, surfaces, photometry, satellites, eclipses.
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:26 Aug 2009 09:54
Last Modified:26 Mar 2013 13:11

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