Photometric observations of asteroid 4 Vesta by the OSIRIS cameras onboard the Rosetta spacecraft S. Fornasier, S. Mottola, M. A. Barucci, H. Sierks and S. Hviid A&A, 533 (2011) L9 Published online: 30 August 2011 DOI: 10.1051/0004-6361/201117600