NOV 19, 2005
NGC 2359: Thor’s Helmet
FEB 2, 2006
Thor’s Helmet in H-Alpha
JAN 17, 2008
Thor’s Emerald Helmet
MAR 12, 2009
Thor’s Helmet (NGC 2359) and Planetary Nebula
MAR 19, 2010
The Seagull and the Duck
JUN 5, 2010
Thor’s Helmet
MAR 7, 2013
Thor’s Helmet
FEB 15, 2014
NGC 2359: Thor’s Helmet
DEC 15, 2016
Seagull to Sirius
MAR 16, 2018
The Seagull and the Duck
FEB 16, 2019
NGC 2359: Thor’s Helmet