Spin and activity of comet 67P/Churyumov-Gerasimenko J.-B. Vincent, L. M. Lara, G. P. Tozzi, Z.-Y. Lin and H. Sierks A&A, 549 (2013) A121 Published online: 10 January 2013 DOI: 10.1051/0004-6361/201219350