NGC 2359 Thor's Helmet

Combination of 10, 3 minute images unfiltered.
SBIG ST-9E CCD. 14" f/11 schmidt-cassegrain telescope with an f/6.3 focal reducer.

NGC 2359, also known as Thor's Helmet is a fairly large nebula surrounding a Wolf-Rayet star. The star is losing a considerable amount of matter in a fast stellar wind and this is ploughing into the surrounding nebula, causing a huge cosmic bubble. Located in Canis Major, NGC 2359 is a relatively easy object even for small telescopes.

Combination of 16, 3 minute images red filter, 11, 3 minute images green filter, and 10, 3 minute images blue filter.
SBIG ST-9E CCD. 5" f/5 refractor at prime focus.

Combination of 5, 3 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.

Combination of 6, 3 minute images using an H-alpha filter.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.

The above image combined with the colour data from a DSLR image.