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Contains:  IC 468, NGC 2359
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Thor's Helmet, NGC 2359, SH2-298, 


            Steven Bellavia
Thor's Helmet, NGC 2359, SH2-298
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Thor's Helmet, NGC 2359, SH2-298

Technical card

Imaging telescopes or lenses: Borg 90FL

Imaging cameras: ZWO ASI 183MM Pro

Mounts: Celestron AVX Mount

Guiding telescopes or lenses: Agena Astro 50mm f/3.9 Guidescope

Guiding cameras: ASI224MC

Focal reducers: Borg 0.72X Quadruplet Super Reducer, #7872

Software: Stark Labs Nebulosity 4.2  ·  Annie's Astro Actions V7  ·  Noel Carboni's Astro Tools for PhotoShop Noel Carboni Actions  ·  Digital Photo Professional  ·  IDEIKI AstroPhotography Tool (APT)  ·  SharpCap Pro 3.2

Filters: Astronomik 6nm OIII  ·  Optolong 7nm Ha 2"

Dates:Feb. 3, 2019Feb. 4, 2019

Astronomik 6nm OIII: 27x300" (gain: 100.00) -15C bin 1x1
Optolong 7nm Ha 2": 27x300" (gain: 100.00) -15C bin 1x1

Integration: 4.5 hours

Darks: ~24

Avg. Moon age: 28.75 days

Avg. Moon phase: 0.91%

Bortle Dark-Sky Scale: 4.00

Basic astrometry details job: 2508684

RA center: 7h 18' 32"

DEC center: -13° 12' 25"

Pixel scale: 1.361 arcsec/pixel

Orientation: 88.460 degrees

Field radius: 0.661 degrees

Resolution: 2800x2100

Data source: Traveller


NGC 2359 (also known as Thor's Helmet, Sharpless 2-298 and Gum 4) is an emission nebula. It is a wind blown bubble around the Wolf-Rayet star WR7, an extremely hot star 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 fine filaments, that contain interstellar material that has been swept up by the fast wind streaming away from the central star.

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.

The nebula is approximately 12,000 light years away in the constellation Canis Major, and 30 light-years in size.



Steven Bellavia
License: None (All rights reserved)


  • Final
    Thor's Helmet, NGC 2359, SH2-298, 


            Steven Bellavia

Sky plot

Sky plot


Thor's Helmet, NGC 2359, SH2-298, 


            Steven Bellavia