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Contains:  NGC 2359, IC 468
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NGC 3261 Thor's Helmet Moravian 16200, 





    
        

            bigeastro
NGC 3261 Thor's Helmet Moravian 16200

NGC 3261 Thor's Helmet Moravian 16200

Technical card

Resolution: 3480x4260

Dates:Dec. 2, 2016

Frames:
Baader Planetarium Baader 2" B: 18x300" bin 2x2
Baader Planetarium Baader 2" G: 18x300" bin 2x2
Baader Planetarium Baader 2" L: 22x300" bin 1x1
Baader Planetarium Baader 2" R: 18x300" bin 2x2

Integration: 6.3 hours

Avg. Moon age: 2.70 days

Avg. Moon phase: 8.03%

Astrometry.net job: 1366129

RA center: 109.626 degrees

DEC center: -13.227 degrees

Pixel scale: 0.618 arcsec/pixel

Orientation: 91.343 degrees

Field radius: 0.473 degrees

Locations: Caxambas Observatory, Southwest, Florida, United States

Description

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 giant 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. It is also catalogued as Sharpless 2-298 and Gum 4.

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 10km/s to at least 30km/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.

NGC2359. N.D. https://en.wikipedia.org/wiki/NGC_2359

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bigeastro
bigeastro
License: None (All rights reserved)
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Revisions

  • NGC 3261 Thor's Helmet Moravian 16200, 





    
        

            bigeastro
    Original
  • NGC 3261 Thor's Helmet Moravian 16200, 





    
        

            bigeastro
    B
  • Final
    NGC 3261 Thor's Helmet Moravian 16200, 





    
        

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    C

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NGC 3261 Thor's Helmet Moravian 16200, 





    
        

            bigeastro