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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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%.
|Title:||New insights on the binary Asteroid 121 Hermione|
|Journal or Publication Title:||Icarus: International Journal of Solar System Studies|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 88-101|
|Keywords:||Asteroids: rotation, surfaces, photometry, satellites, eclipses.|
|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:||26 Aug 2009 09:54|
|Last Modified:||26 Mar 2013 13:11|
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