Rotational brightness variations in Trans-Neptunian Object 50000 Quaoar J. L. Ortiz, P. J. Gutiérrez, A. Sota, V. Casanova and V. R. Teixeira A&A, 409 2 (2003) L13-L16 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031253