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Contains:  M 43, NGC 1982, M 42, Great Nebula in Orion, NGC 1976, The star θ2Ori, The star θ1Ori
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M42 - Heart of Orion Nebula - NB HST + CFHT, 





    
        

            Barry Brook
M42 - Heart of Orion Nebula - NB HST + CFHT

M42 - Heart of Orion Nebula - NB HST + CFHT

Technical card

Resolution: 2205x1697

Dates:Sept. 12, 2014

Frames:
Astronomik Ha 12nm 1.25'': 25x120" 3C bin 1x1
Astronomik OIII 12nm 1.25": 25x120" bin 1x1
Astronomik SII 12nm 1.25": 25x120" bin 1x1

Integration: 2.5 hours

Darks: ~70

Flats: ~100

Bias: ~500

Avg. Moon age: 18.59 days

Avg. Moon phase: 84.32%

Bortle Dark-Sky Scale: 7.00

Mean FWHM: 2.20

Temperature: 10.00

Astrometry.net job: 385282

RA center: 83.825 degrees

DEC center: -5.385 degrees

Orientation: -88.849 degrees

Field radius: 0.480 degrees

Description

The heart of the Great Nebula in Orion, M42, imaged in narrowband with HST palette (Red = SII, Green = Ha, Blue = OIII). I also tried the CFHT palette (Red = Ha, Green = OIII, Blue = SII -- the more pinkish image). Which do you prefer?

A synthetic luminance was created by separate post-processing of each channel and then normalized blending (first, greyscale image).

Imaged with a fast (f/4) 120mm achromat refractor, with 25 x 2 min subs per channel. Camera was a drizzled Orion Starshoot G3, with Astronomik 12nm NB filters.

Comments

Author

Amaranthus
Barry Brook
License: Attribution Creative Commons
4670
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Revisions

  • M42 - Heart of Orion Nebula - NB HST + CFHT, 





    
        

            Barry Brook
    Original
  • Final
    M42 - Heart of Orion Nebula - NB HST + CFHT, 





    
        

            Barry Brook
    B
  • M42 - Heart of Orion Nebula - NB HST + CFHT, 





    
        

            Barry Brook
    C

Sky plot

Sky plot

Histogram

M42 - Heart of Orion Nebula - NB HST + CFHT, 





    
        

            Barry Brook