67P/Churyumov-Gerasimenko at large heliocentric distance C. Tubiana, H. Böhnhardt, J. Agarwal, M. Drahus, L. Barrera and J. L. Ortiz A&A, 527 (2011) A113 Published online: 04 February 2011 DOI: 10.1051/0004-6361/201016027