Volume 542, June 2012
|Number of page(s)||5|
|Section||Catalogs and data|
|Published online||25 May 2012|
III. Results for 33 X-type objects
Universidad Nacional de San Juan,
J. I. de la Roza 590 oeste, 5400
2 Complejo Astronómico El Leoncito (CONICET), Av. España 1512 sur, J5402 DSP San Juan, Argentina
3 Universidad de Alicante, PO Box 99, 03080 Alicante, Spain
Received: 23 December 2011
Accepted: 10 April 2012
Aims. We present results of a polarimetric survey of main-belt asteroids at Complejo Astronómico El Leoncito (Casleo), San Juan, Argentina. The aims of this survey are to increase the database of asteroid polarimetry, to estimate diversity in polarimetric properties of asteroids that belong to different taxonomic classes, and to search for objects that exhibit anomalous polarimetric properties.
Methods. The data were obtained with the Torino and CASPROF polarimeters at the 2.15 m telescope. The Torino polarimeter is an instrument that allows the simultaneous measurement of polarization in five different bands, and the CASPROF polarimeter is a two-hole aperture polarimeter with rapid modulation.
Results. The survey began in 2003, and up to 2009 data of a sample of more than 170 asteroids were obtained. In this paper the results for 33 X-type objects are presented, several of them are being polarimetrically observed for the first time. Using these data we found polarization curves and polarimetric parameters for different groups among this taxonomic class and that there are objects with very different albedo in the sub-classes of the X taxonomic complex.
Key words: minor planets, asteroids: general / techniques: polarimetric
Based on observations carried out at the Complejo Astronómico El Leoncito, operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba, and San Juan.
Table 1 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A11
© ESO, 2012
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