Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..472f&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.472
Computer Science
Scientific paper
We have carried out a spectroscopic survey in the 2004-2007 years of X-type asteroids in the visible and near infrared range at the NTT, TNG and IRTF telescopes. In this paper we present new VIS-NIR spectra of 24 asteroids belonging to the X type as defined by Tholen & Barucci [1], that is an "E-M-P" type asteroid for which albedo information was not available at the time of their classification. We find a large variety of near-infrared spectral behaviors within the X class, and we identify weak absorption bands in spectra of 11 asteroids. Our spectra, together with the new albedo values [2], can be used to suggest new Tholen classifications for these objects. To constrain their compositions, we conduct a search for meteorite analogues using the RELAB database, and we model the asteroid surface composition with geographical mixtures of selected minerals when a meteorite match is not satisfactory. In addition, we present an analysis of X complex spectral slope values and class distributions in the asteroid main belt, where we include previously published observations ofMand E-type asteroids obtained during the same survey [3,4].
Clark Beth Ellen
Dotto Elisabetta
Fornasier Sonia
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