| Issue |
A&A
Volume 569, September 2014
|
|
|---|---|---|
| Article Number | A122 | |
| Number of page(s) | 6 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201424238 | |
| Published online | 02 October 2014 | |
Polarimetric survey of main-belt asteroids⋆,⋆⋆
IV. New results from the first epoch of the CASLEO survey
1 Complejo Astronómico El Leoncito (CONICET), Av. España 1512 sur, J5402DSP San Juan Argentina
e-mail: rgilhutton@casleo.gov.ar
2 Universidad Nacional de San Juan, J. I. de la Roza 590 oeste, 5400 Rivadavia, San Juan, Argentina
3 INAF – Osservatorio Astrofisico di Torino, 10025 Pino Torinese, Italy
4 Université de Nice Sophia Antipolis, Observatoire de la Côte d’Azur, CNRS UMR 7293 Lagrange, Nice, France
Received: 20 May 2014
Accepted: 7 August 2014
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 using the Torino and CASPROF polarimeters at the 2.15m telescope. The Torino polarimeter is an instrument that allows 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 1995, and until 2012 data on a large sample of asteroids were obtained. We here present and analyze the unpublished results for 129 asteroids of different taxonomic types, 56 which were polarimetrically observed for the first time. We find that the asteroids (402) Chloe and (729) Watsonia are Barbarians, and asteroid (269) Justitia shows a phase – polarization curve that seems to have a small inversion angle. Data obtained in UBVRI colors allow us to sketch an analysis of the wavelength dependence of the degree of linear polarization for 31 asteroids, in spite of some large error bars in some cases.
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 (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/569/A122
© ESO, 2014
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