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HD 11123


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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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Observation and Astrometry data

Constellation:Cetus
Right ascension:01h49m01.37s
Declination:-17°45'54.5"
Apparent magnitude:9.446
Proper motion RA:-47.1
Proper motion Dec:-86.4
B-T magnitude:10.31
V-T magnitude:9.518

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 11123
TYCHO-2 2000TYC 5855-1509-1
USNO-A2.0USNO-A2 0675-00643329
HIPHIP 8455

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