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Coordinated thermal and optical observations of Trans-Neptunian object (20 000)Varuna from Sierra Nevada
Authors: Lellouch, E.; Moreno, R.; Ortiz, J. L.; Paubert, G.; Doressoundiram, A.; Peixinho, N.
Ref.: Astronomy and Astrophysics 391, 1133-1139 (2002)
Abstract: We report on coordinated thermal and optical measurements of trans-Neptunian object (20 000)Varuna obtained in January-February 2002, respectively from the IRAM 30-m and IAA 1.5 m telescopes. The optical data show a lightcurve with a period of 3.176 +/- 0.010 hr, a mean V magnitude of 20.37 +/- 0.08 and a 0.42 +/- 0.01 magnitude amplitude. They also tentatively indicate that the lightcurve is asymmetric and double-peaked. The thermal observations indicate a 1.12+/- 0.41 mJy flux, averaged over the object's rotation. Combining the two datasets, we infer that Varuna has a mean 1060+180-220 km diameter and a mean 0.038+0.022-0.010 V geometric albedo, in general agreement with an earlier determination using the same technique.
