Rotations and densities of trans-Neptunian objects D. Perna, E. Dotto, M. A. Barucci, A. Rossi, S. Fornasier and C. de Bergh A&A, 508 1 (2009) 451-455 Published online: 21 October 2009 DOI: 10.1051/0004-6361/200911970