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Issue A&A
Volume 422, Number 3, August II 2004
Page(s) L59 - L62
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20048009



A&A 422, L59-L62 (2004)
DOI: 10.1051/0004-6361:20048009

Letter

Mineralogical characterization of A-type asteroid (1951) Lick

J. de León1, R. Duffard2, J. Licandro3, 1 and D. Lazzaro2

1  Instituto de Astrofísica de Canarias, c/Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
    e-mail: jmlc@iac.es
2  Observatório Nacional - MCT, Rua Gal. José Cristino 77, Rio de Janeiro, 20921-400 RJ, Brazil
    e-mail: duffard@on.br
3  Isaac Newton Group, PO Box 321, 38700 Santa Cruz de La Palma, La Palma, Spain

(Received 22 April 2004 / Accepted 21 June 2004)

Abstract
We have obtained visible and near-infrared reflectance spectra of asteroid (1951) Lick. According to its spectral characteristics in the visible region, this object has been classified as an A-type asteroid by Bus & Binzel (2002b). Here we present a mineralogical analysis of the reflectance spectrum obtained for this object. We compute several parameters that are extracted from the spectrum of the asteroid and that give relevant information about its mineralogical composition, using the method defined by Gaffey et al. (1993). We also present results obtained through the fit to the absorption band associated to the pressence of olivine using the Modified Gaussian Model (MGM) method developed by Sunshine et al. (1990). Our results indicate that (1951) Lick is an almost pure olivine. The composition of olivine on the surface of Lick is estimated to be about Fo $_{90\pm10}$ (low-iron content).


Key words: minor planets, asteroids -- solar system: general




© ESO 2004


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