The surface of the transneptunian object 90482 Orcus C. de Bergh, A. Delsanti, G. P. Tozzi, E. Dotto, A. Doressoundiram and M. A. Barucci A&A, 437 3 (2005) 1115-1120 Published online: 30 June 2005 DOI: 10.1051/0004-6361:20042533