Volume 436, Number 3, June IV 2005
|Page(s)||1113 - 1121|
|Section||Planets and planetary systems|
|Published online||03 June 2005|
Analysis of near-IR spectra of 1 Ceres and 4 Vesta, targets of the Dawn mission
LESIA, Observatoire de Paris, 92195 Meudon Principal Cedex, France e-mail: firstname.lastname@example.org
2 IMCCE, Observatoire de Paris, 77 Av. Denfert Rochereau, 75014 Paris Cedex, France
3 INAF-Osservatorio Astrofisico di Catania, via Santa Sofia 78, 95123 Catania, Italy
4 Dipartimento di Astronomia di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
Accepted: 3 February 2005
We obtained high signal to noise spectra of the two targets of the Dawn mission, 4 Vesta and 1 Ceres from observations carried out in remote control between the Observatoire de Paris-Meudon and the NASA Infrared Telescope Facility on Mauna Kea. 4 Vesta was observed in the 0.7–2.5 spectral region at three different rotational phases in order to i) determine the mineral composition; ii) understand the spectral variations across the surface. Vesta was also observed in the 2.0–3.8 range. The 3 μm absorption feature was not detected, implying the absence of OH and/or H2O-bearing minerals on the asteroid surface at the latitude of our observations. The spectrum of 1 Ceres was obtained in the 2.0–4.1 μm range and the presence of the 3.06 μm absorption feature confirmed. Laboratory measurement of ion-irradiated organics and ices suggest that the 3.06 μm feature can be reproduced with a linear mixture of crystalyne ice and residues of ion-irradiated asphaltite.
Key words: minor planets, asteroids / techniques: spectroscopic / infrared: solar system
© ESO, 2005
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