Asteroid 21 Lutetia : UBVRI Light Curves from OSIRIS-NAC

Details Asteroid 21 Lutetia : UBVRI Light Curves from OSIRIS-NAC Asteroid 21 Lutetia : UBVRI Light Curves from OSIRIS-NAC

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....40.2838f&link_type=abstract

American Astronomical Society, DPS meeting #40, #28.38; Bulletin of the American Astronomical Society, Vol. 41, p.559

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We report on new observations aimed at characterizing asteroid 21 Lutetia, one of the targets of the Rosetta space mission. The asteroid was imaged with the OSIRIS-NAC camera during the cruise phase of the Rosetta spacecraft, at a phase angle of 22.36º, and was continuously monitored over 14 hr (on 2 and 3 January 2007), thus covering one rotational period and a half. From accurate photometric calibrations with the solar analog star, 16 CygB, we have obtained high quality light curves of 21 Lutetia in the U, B, V, R and I photometric bands. We confirm a sidereal period of 8.17 hr. No spectral variations with the rotation have been found. The resulting reflectivity spectrum is in a very good agreement with that of Barucci et al. (2005). Combining with existing observations, we have obtained its phase function.

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