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

Free access article

Issue		A&A Volume 436, Number 3, June IV 2005


Page(s)		1113 - 1121
Section		Planets and planetary systems
DOI		http://dx.doi.org/10.1051/0004-6361:20042506

A&A 436, 1113-1121 (2005)
DOI: 10.1051/0004-6361:20042506

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

P. Vernazza¹, T. Mothé-Diniz¹, M. A. Barucci¹, M. Birlan², J. M. Carvano¹, G. Strazzulla³, M. Fulchignoni¹ and A. Migliorini^{1, 4}

¹ LESIA, Observatoire de Paris, 92195 Meudon Principal Cedex, France
e-mail: pierre.vernazza@obspm.fr
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

(Received 8 December 2004 / Accepted 3 February 2005)

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 $\mu{\rm m}$ 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 $\mu{\rm m}$ range. The 3 $\mu$ m 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 $\mu$ m range and the presence of the 3.06 $\mu$ m absorption feature confirmed. Laboratory measurement of ion-irradiated organics and ices suggest that the 3.06 $\mu$ m 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

SIMBAD Objects

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.