Observational results for eight long-period comets observed far from the Sun E. Mazzotta Epifani, D. Perna, L. Di Fabrizio, M. Dall’Ora, P. Palumbo, C. Snodgrass, J. Licandro, V. Della Corte and G. P. Tozzi A&A, 561 (2014) A6 Published online: 17 December 2013 DOI: 10.1051/0004-6361/201321290