Observations of Varuna at millimeter and optical wavelength

Details Observations of Varuna at millimeter and optical wavelength Observations of Varuna at millimeter and optical wavelength

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dps....34.1701m&link_type=abstract

American Astronomical Society, DPS Meeting #34, #17.01; Bulletin of the American Astronomical Society, Vol. 34, p.870

Astronomy and Astrophysics

Astronomy

Scientific paper

We report observations of trans-Neptunian object (20000) Varuna at millimeter(mm) and optical wavelengths, obtained in January-February 2002 from the IRAM 30m and IAA 1.5m telescopes. The bolometric measurement from IRAM indicates a flux at 1.2 mm of 1.12+/-0.41 mJy, averaged over the object's rotation. The optical measurements 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. These data tentatively indicate that the lightcure is asymmetric and double-peaked. The joint analysis of these two datasets, has permitted to infer a mean 1060+180-220 km diameter, and a mean 0.038+0.022-0.010 V geometric albedo, fully consistent with the canonical 4% value assumed in size distribution studies.

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