Thor's Helmet (upside down) - 12.5 hours total exposure taken at Sierra Skies Observatory over 9 nights in February 2011 using HaRGB filters. Imaged using STL-11000M camera with AO-L through 12" LX200R scope at 3260mm FL. Mostly unattended imaging with CCDAutoPilot, MaximDL and TheSky - with conditions including clear skies with very poor seeing or great seeing with high thin clouds.