Outgassing Behavior of C/2012 S1 (ISON) From September 2011 to June 2013 Posted on June 26, 2014 by UHNAI Webmaster in Meech, K. J., and 28 colleagues (including J. Keane, J. Kleyna, T. Riesen, M. Ansdell) (). Outgassing Behavior of C/2012 S1 (ISON) From September 2011 to June 2013. , 776,