The Thor’s Helmet or Duck Nebula, NGC 2359 in Canis Major. Faint cluster at left of nebula is Haffner 6, one at upper left is Haffner 8; one at left edge of frame, centre, is NGC 2374. This is a stack of 4 x 10 minute exposures at ISO 800 with the Canon 5D MkII and Astro-Physics Traveler 105mm apo refractor at f/5.8 with the 6×7 field flattener. Taken from Timor Cottage, Coonabarabran, Australia, December 18/19, 2012.
The Amazing Sky 