NGC 2359

Alt. Designations: NGC 2359
Object Type: emission nebula
Constellation: Canis Major
Distance: 15 kly
Right Ascension: 07h 18m 30.0s
Declination: -13° 13´ 30"
Visual Magnitude:
Apparent Dimension: 9.0´ X 6.0´
Best Month To View: Dec

NGC 2359 is an emission nebula in the constellation Canis Major. The nebula is approximately 15,000 light-years away and 30 light-years in diameter. 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. 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.  Visually through most amateur telescopes, this nebula is very faint, and requires Narrow-Band (UHC or O-III) filters to enhance contrast.