Comet 67P/Churyumov-Gerasimenko at a large heliocentric distance C. Tubiana, L. Barrera, M. Drahus and H. Boehnhardt A&A, 490 1 (2008) 377-386 Published online: 11 September 2008 DOI: 10.1051/0004-6361:20078792