Analysis of near-IR spectra of 1 Ceres and 4 Vesta, targets of the Dawn mission - Sorbonne Université Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2005

Analysis of near-IR spectra of 1 Ceres and 4 Vesta, targets of the Dawn mission

Abstract

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 μm 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 μm 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.
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Dates and versions

hal-00616389 , version 1 (22-08-2011)

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Pierre Vernazza, Thais Mothé-Diniz, Maria Antonietta Barucci, Mirel Birlan, J.M. Carvano, et al.. Analysis of near-IR spectra of 1 Ceres and 4 Vesta, targets of the Dawn mission. Astronomy and Astrophysics - A&A, 2005, 436 (3), pp. 1113-1121. ⟨10.1051/0004-6361:20042506⟩. ⟨hal-00616389⟩
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