Mike,
This is a nebula formed around a Wolf Rayet star HD56925 in Canis Major. Andrew Murrell wrote an excellent article on Wolf Rayet stars which starts on page 72 of the Nov/Dec 2004 edition of Sky and Space. The article contains a lot of information on Wolf Rayet stars and in particular "Thors Helmut" as well as a great pic of Thors Helmut. Definately worth reading if this target rows your boat.
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Originally Posted by iceman
I was fortunate enough to view the nebula through Wazza's 18" truss dob at IISAC 2006 last weekend, using a OIII filter. Again a very pleasing view, and confirms again that aperture and a narrowband filter really make a difference on this one.
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Also just to clarrify something regarding your comment about the OIII filter. A UHC filter is a "Narrowband" filter, whereas an OIII filter is known as a "line filter" because it allows only a "single" emission line to pass. A H-Beta or "Horsehead" filter is also a line filter. A UHC or narrowband filter allows more than one emission line across a narrow band of the spectrum.
CS-John B