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Contains:  NGC 2359
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NGC2359 Thor's Helmet, 


            Jerry Macon
NGC2359 Thor's Helmet

NGC2359 Thor's Helmet

Technical card

Resolution: 2030x1414

Dates:Dec. 15, 2017Dec. 30, 2017

Ha: 19x600" (gain: 49.00) -25C bin 1x1
Baader OIII: 18x600" (gain: 49.00) -25C bin 1x1
Baader RGB 36mm: 62x300" (gain: 49.00) -25C bin 1x1

Integration: 11.3 hours

Avg. Moon age: 19.39 days

Avg. Moon phase: 48.44%

Bortle Dark-Sky Scale: 4.00 job: 1942371

RA center: 109.668 degrees

DEC center: -13.223 degrees

Pixel scale: 1.181 arcsec/pixel

Orientation: 89.474 degrees

Field radius: 0.406 degrees

Locations: Dark Star Observatory, Taos, New Mexico, United States


NGC 2359 (also known as Thor's Helmet) is an emission nebula in the constellation Canis Major. The nebula is approximately 3,670 parsecs (11.96 thousand light years) away and 30 light-years in size. The central star is the Wolf-Rayet star WR7, an extremely hot star thought to be in a brief pre-supernova stage of evolution. It is similar in nature to the Bubble Nebula, but 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.

The nebula has an overall bubble shape, but with complex filamentary structures. The nebula contains several hundred solar masses of ionised material, plus several thousand more of unionised gas. It is largely interstellar material swept up by winds from the central star, although some material does appear to be enriched with the products of fusion and is likely to come directly from the star. The expansion rate of different portions of the nebula varies from 10 km/s to at least 30 km/s, leading to age estimates of 78,500 - 236,000 years. The nebula has been studied at radio and x-ray wavelengths, but it is still unclear whether it was produced at the class O main sequence stage of development, as a red supergiant, luminous blue variable, or mainly as a Wolf-Rayet star.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


NGC2359 Thor's Helmet, 


            Jerry Macon