Volatile Compositions of Short Period Comets 2P/Encke and 21P/Giacobini-Zinner Across Apparitions.Jan 1, 2010·Roth NX,Gibb EL,Vervack Jr RJ,McKay AJ,Kawakita H,Saki M,et al· 0 min readpublicationsLast updated on Jan 1, 2010 ← Three-dimensional direct simulation Monte-Carlo modeling of the coma of comet 67P/Churyumov-Gerasimenko observed by the VIRTIS and ROSINA instruments on board Rosetta. Jan 1, 2010