Surface composition and temperature of the TNO Orcus M. A. Barucci, F. Merlin, A. Guilbert, C. de Bergh, A. Alvarez-Candal, O. Hainaut, A. Doressoundiram, C. Dumas, T. Owen and A. Coradini A&A, 479 1 (2008) L13-L16 Published online: 09 January 2008 DOI: 10.1051/0004-6361:20079079