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Contains:  Witch Head nebula, IC 2118, The star ψEri
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IC2118 Witch Head Nebula, 





    
        

            Randal Healey

IC2118 Witch Head Nebula

Technical card

Resolution: 3081x2354

Dates:Jan. 3, 2018Jan. 4, 2018

Frames:
Astrodon LRGB Gen2 E-Series Tru-Balance Filters: 35x300" -30C bin 1x1
Astrodon LRGB Gen2 E-Series Tru-Balance Filters: 30x600" -30C bin 1x1

Integration: 7.9 hours

Darks: ~50

Flats: ~30

Bias: ~75

Avg. Moon age: 16.95 days

Avg. Moon phase: 94.37%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2348327

Locations: Healey "Utahopia" Observatory, Kaysville, Utah, United States

Data source: Backyard

Description

IC 2118 (also known as Witch Head Nebula due to its shape) is an extremely faint reflection nebula believed to be an ancient supernova remnant or gas cloud illuminated by nearby supergiant star Rigel in Orion. It lies in the Eridanus constellation, about 900 light-years from Earth. The nature of the dust particles, reflecting blue light better than red, is a factor in giving the Witch Head its blue color. Radio observations show substantial carbon monoxide emission throughout parts of IC 2118, an indicator of the presence of molecular clouds and star formation in the nebula. In fact candidates for pre-main sequence stars and some classic T-Tauri stars have been found deep within the nebula.

The molecular clouds of IC 2118 are probably juxtaposed to the outer boundaries of the vast Orion-Eridanus bubble, a giant supershell of molecular hydrogen blown by the high mass stars of the Orion OB1 association. As the supershell expands into the interstellar medium, favorable circumstances for star formation occur. IC 2118 is located in one such area. The wind blown appearance and cometary shape of the bright reflection nebula is highly suggestive of a strong association with the high mass luminous stars of Orion OB1. The fact that the heads of the cometary clouds of IC2118 point northeast towards the association is strong support of that relationship.

Comments

Author

RandalHealey
Randal Healey
License: None (All rights reserved)
1411
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Revisions

  • IC2118 Witch Head Nebula, 





    
        

            Randal Healey
    Original
  • IC2118 Witch Head Nebula, 





    
        

            Randal Healey
    B
  • IC2118 Witch Head Nebula, 





    
        

            Randal Healey
    C
  • IC2118 Witch Head Nebula, 





    
        

            Randal Healey
    D
  • Final
    IC2118 Witch Head Nebula, 





    
        

            Randal Healey
    E

D

Re-processed using PixInsight and other changes as well. I believe a much better look.

Histogram

IC2118 Witch Head Nebula, 





    
        

            Randal Healey