EDP Sciences
Free access
Volume 444, Number 3, December IV 2005
Page(s) 977 - 982
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20053642

A&A 444, 977-982 (2005)
DOI: 10.1051/0004-6361:20053642

Search for surface variations on TNO 47171 and Centaur 32532

F. Merlin1, M. A Barucci1, E. Dotto2, C. de Bergh1 and G. Lo Curto3

1  LESIA, Observatoire de Paris, 92195 Meudon Principal Cedex, France
    e-mail: frederic.merlin@obspm.fr
2  INAF, Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone (Roma), Italy
3  European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile

(Received 16 June 2005 / Accepted 7 August 2005 )

We present photometric and spectroscopic observations of one Trans-Neptunian Object (TNO 47171 1999 TC36) and one Centaur (Thereus also named 32532 2001 PT13). Near-infrared data were acquired with the ISAAC instrument at one of the 8 m telecopes of the Very Large Telescope (VLT, ESO-Cerro Paranal, Chile), while visible data were obtained with the EFOSC2 instrument on the 3.6 m telescope of La Silla (ESO, Chile). These observations were performed to search for rotational variations for both targets. Water ice has been confirmed on both objects. The surface composition models of the targets are presented and discussed, and are also compared to previous observations available in the literature.

Key words: Kuiper Belt -- radiative transfer -- techniques: spectroscopic

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© ESO 2005

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