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. Known as a Wolf-Rayet star, the central star is 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. This image was taken February 22, 23 and 24, 2011. It consists of 4.5 hours of RGB data and 130 minutes of luminance images. There is also one hour of h-alpha data taken February 27. Seeing was only fair. Click on the image for a closer view. This imaging session was under the control of CCDAutopilot.