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ESO large program about transneptunian objects: surface variations on (47171) 1999 TC{36}
Aims: We investigate the surface composition of the Plutino (47171) 1999TC{36}. Methods: We completed near-infrared photometric andspectroscopic observations of (47171) 1999 TC{36} with the adaptiveoptics instrument NACO at the ESO VLT during 12 October 2006, andpresent these data with ISAAC and SINFONI spectroscopic observationscarried out about one month later on 9 November 2006 and 8 November2006, respectively. The ISAAC and SINFONI spectroscopic observationswere combined with a visible spectrum obtained by FORS1 on 9 November2006. Composition and properties of the compounds present on the surfaceof the target are investigated by applying a Hapke radiative transfermodel to the measured spectra and to previously published observations.Results: We present the relative reflectance spectrum of (47171)1999 TC{36} in the wavelength range (0.37-2.33) ?m. An intimatemixture of Triton tholin, Titan tholin, serpentine, and Triton tholindiluted in water ice represents the best-fit model description of themeasured spectrum. Any significant differences from the publishedspectra of (47171) 1999 TC{36} taken on 2001 and 2003 could be due tosurface heterogeneity.Based on observations at the European Southern Observatory, Chile withinthe framework of Program 178.C-0036.
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