New cases of unusual polarimetric behavior in asteroids

Details New cases of unusual polarimetric behavior in asteroids New cases of unusual polarimetric behavior in asteroids

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...482..309g&link_type=abstract

Astronomy and Astrophysics, Volume 482, Issue 1, 2008, pp.309-314

Astronomy and Astrophysics

Astrophysics

6

Solar System: General, Minor Planets, Asteroids, Polarization

Scientific paper

Aims: Results of different polarimetric campaigns at Complejo Astronómico El Leoncito (Casleo), San Juan, Argentina are presented. The aim of these campaigns was to search for objects exhibiting anomalous polarimetric properties, similar to those shown by the Ld-class asteroid (234) Barbara, among members of the same or similar taxonomic classes. Methods: The data have been obtained with Torino and CASPROF polarimeters at the 2.15 m telescope. The Torino polarimeter is an instrument that allows simultaneous measurement of polarization in five different bands, and CASPROF polarimeter is a two-hole aperture polarimeter with rapid modulation. Results: The campaigns began in 2005, and we found four new asteroids with Barbara-like polarimetric properties: the L-class objects (172) Baucis, (236) Honoria and (980) Anacostia, and the K-class asteroid (679) Pax. The polarimetric properties of the phase-polarization curves of these objects may be produced by a mixture of high- and low-albedo particles in their regolith as a result of the fragmentation of a substrate that is spectrally analog to the CO3/CV3 chondrites.
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.

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