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Rolf's Astrophotography
  • An Astrophotography Journey!
  • Clusters
    • Globular Clusters
      • M13 – Hercules Cluster
      • M15 – Great Pegasus Cluster
      • M2
      • M3
      • M56
      • M92
      • NGC 6934
      • NGC 7006
    • Open Clusters
      • IC 348
      • M34
      • M35 and NGC 2158
      • M39
      • M45 – The Pleiades
      • M52
      • NGC 869 and NGC 884 – Perseus Double Cluster
  • Galaxies
    • Elliptical Galaxies
      • Galaxy Cluster ACO 262
      • Galaxy Cluster ACO 347
      • Galaxy Cluster ACO 426
      • Leo I (UGC 5470, PGC 29488, MCG)
      • M105, NGC 3384, and NGC 3389
      • NGC 4125 and NGC 4121
      • M87 – Virgo A
      • Markarian’s Chain with M84, M86, and M87
      • NGC 1272, NGC 1275 – The Perseus Cluster
      • NGC 3613, NGC 3619, and NGC 3625
      • NGC 3998
      • NGC 4889 and other galaxies in Coma Berenices
      • PGC 2641182
    • Irregular Galaxies
      • M82 – Cigar Galaxy
      • NGC 2366 and NGC 2363
      • NGC 4449
    • Spiral Galaxies
      • IC 2574 – Coddington’s Nebula
      • M95
      • NGC 3198
      • NGC 3614
      • NGC 3945, NGC 3975, and NGC 3978
      • NGC 4041 and NGC 4036
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      • M100
      • M101 – Pinwheel Galaxy
      • M102 – Spindle Galaxy
      • M106
      • M108
      • M109
      • M31 – Andromeda Galaxy
      • M33 – Triangulum Galaxy
      • M51 – Whirlpool Galaxy
      • M63 – Sunflower Galaxy
      • M64 – Black Eye Galaxy
      • M65, M66, and NGC 3628 – The Leo Triplet
      • M81 – Bode’s Galaxy
      • M94
      • M96
      • NGC 2403
      • NGC 2683 – UFO Galaxy
      • NGC 2775
      • NGC 2841
      • NGC 3184
      • NGC 3642
      • NGC 4236
      • NGC 4244 – Silver Needle Galaxy
      • NGC 4490 – Cocoon Galaxy
      • NGC 4559
      • NGC 4565 (C38) – Needle Galaxy
      • NGC 4631 (Whale Galaxy) and NGC 4656
      • NGC 5005
      • NGC 5216, NGC 5218 – Keenan’s System
      • NGC 5907 – Knife Edge Galaxy
      • NGC 6946 – Fireworks Galaxy
      • NGC 7331
      • NGC 891 – Silver Galaxy
      • NGC 925 – Amatha Galaxy
    • The Milky Way
  • Nebulas
    • Dark Nebulas
      • IC 434 – Horsehead Nebula
      • NGC 2264 – Cone Nebula and Christmas Tree Cluster
    • Emission Nebulas
      • Sh 2-261 – Lower’s Nebula
      • IC 1396 – Elephant’s Trunk Nebula
      • IC 1805 – Heart Nebula
      • IC 1848 – Soul Nebula
      • IC 2177 – Seagull Nebula
      • IC 405 – Flaming Star Nebula
      • IC 5070 – Pelican Nebula
      • IC 5146 – Cocoon Nebula
      • IC 59 and IC 63 – Gamma Cassiopeia Nebula
      • M42 – Orion Nebula
      • NGC 1491
      • NGC 1499 – California Nebula
      • NGC 1931 and IC 417
      • NGC 2174 – Monkey Head Nebula
      • NGC 2237 – Rosette Nebula
      • NGC 2359 – Thor’s Helmet
      • NGC 281 – Pacman Nebula
      • NGC 6888 – Crescent Nebula
      • NGC 7000 – North America Nebula
      • NGC 7635 – Bubble Nebula
      • NGC 7822
      • NGC 896
      • Sadr and the Gamma Cygni Nebula (IC 1318)
      • Sh 2-155 – Cave Nebula
    • Planetary Nebulas
      • Sh 2-290 (ACO 31)
      • Abell 21 – Medusa Nebula
      • Jones-Emberson 1 Nebula
      • M27 – Dumbbell Nebula
      • M57 – Ring Nebula
      • M76 – Little Dumbbell Nebula
      • M97 – Owl Nebula
      • NGC 1501
      • NGC 40 – Bow Tie Nebula
      • NGC 6543 – Cat’s Eye Nebula
      • NGC 6826 – Blinking Planetary
      • NGC 7662 – Snowball Nebula
    • Reflection Nebulas
      • NGC 1977 – Running Man Nebula
      • IC 2118 – Witch Head Nebula
      • M78
      • NGC 7023 – Iris Nebula
    • Supernova Remnants
      • IC 443 – Jellyfish Nebula
      • M1 – Crab Nebula
      • NGC 6960 – Veil Nebula
  • Solar System
    • Comets
      • Comet Tsuchinshan-ATLAS (C2023 A3)
    • The Moon
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  • The Gear
    • APO107 Configuration Example
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Rolf's Astrophotography

NGC 2359 – Thor’s Helmet

NGC 2359 (also known as Thor’s Helmet) is an emission nebula in the constellation Canis Major. The nebula is approximately 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.

WR 7 (HD 56925) is a Wolf–Rayet star at the centre of NGC 2359. Assuming a distance of 4.8 kiloparsecs (15,600 light-years), this star is calculated to be 280,000 times brighter than our Sun] 16 times more massive, and 1.41 times larger with a surface temperature of 112,000 K.

Stars of its kind are characterised by a rapid loss of stellar mass, driven by chemically enriched high-speed stellar winds. It is estimated that it loses mass at the rate of 7×10−5 solar masses each year through winds of 1,545 km/s.

NGC 2359, Thor's Helmet
NGC 2359, Thor’s Helmet
NGC 2359 (also known as Thor’s Helmet) is an emission nebula in the constellation Canis Major. The nebula is approximately 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. WR 7 (HD 56925) is a Wolf–Rayet star at the centre of NGC 2359. Assuming a distance of 4.8 kiloparsecs (15,600 light-years), this star is calculated to be 280,000 times brighter than our Sun] 16 times more massive, and 1.41 times larger with a surface temperature of 112,000 K. Stars of its kind are characterised by a rapid loss of stellar mass, driven by chemically enriched high-speed stellar winds. It is estimated that it loses mass at the rate of 7×10−5 solar masses each year through winds of 1,545 km/s. Photographed with APO 107mm refractor telescope and Atik 360EX monochrome CCD camera at Hammarby gård in February 2020. Exposure was 56min Ha, 10min red, 44min OIII, and 10 min blue. OIII+blue used as both blue and green channel in the processed picture. Located only 10 degrees above the southern horizon.
NGC 2359, Thor's Helmet Nebula
NGC 2359, Thor’s Helmet Nebula
Photographed with the 94 mm APO refractor telescope and ASI 2600MC color CMOS camera in Åva, February 5th 2025. Exposure was 40 * 3 min with IDAS LPS P3 light pollution filter under a half moon. Postprocessing in Pixinsight and Photoshop.
NGC 2359, Thor's Helmet Nebula
NGC 2359, Thor’s Helmet Nebula
Photographed with the 94 mm APO refractor telescope and ASI 2600MC color CMOS camera in Åva, February 5th 2025. Exposure was 40 * 3 min with IDAS LPS P3 light pollution filter under a half moon. Postprocessing in Pixinsight and Photoshop.
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