NGC 2359 (also known as Thor's Helmet) is an emission nebula in the constellation Canis Major.
The nebula is approximately 15,000 light-years away and 30 light years in size.
The central star is the Wolf-Rayet star HD 56925, an extremely hot giant thought to be in a brief, pre-supernova stage of evolution.
It is similar in nature to the Bubble Nebula, interactions with a nearby large molecular cloud are thought to have contributed to the more complex shape and curved bow-shock structure of Thor's Helmet.

It is also Sharpless catalog Sh2-298 and Gum catalog 4 (WIKI)


Hubble color mapping
Ha for 3 Hrs (Bin 1)
O3, S2 for 30 min (Bin 2)

RGB 10 min each for star color(Bin 2)
Total of 4.5 HRS

Imaged with the 16" f3.75 Dream Astrograph.
Apogee Alta U-16M camera.

Imaged from Tivoli farm in Namibia August 2015.