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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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M 42 Orion Nebula, 





    
        

            Michael Timm
M 42 Orion Nebula

M 42 Orion Nebula

Technical card

Resolution: 8264x5636

Dates:Nov. 17, 2018

Frames:
24x300" (gain: 120.00) -20C bin 1x1
60x60" (gain: 120.00) -20C bin 1x1

Integration: 3.0 hours

Darks: ~49

Flats: ~25

Flat darks: ~25

Bias: ~250

Avg. Moon age: 9.08 days

Avg. Moon phase: 67.65%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2377215

RA center: 83.818 degrees

DEC center: -5.379 degrees

Pixel scale: 0.403 arcsec/pixel

Orientation: 95.255 degrees

Field radius: 0.560 degrees

Locations: Backyard, Vechelde, Niedersachsen, Germany

Data source: Backyard

Description

I was really surprised to see how detailed a single frame of M 42 is. I knew this is an easy to shoot target, but i didn't knew how easy it would be. On the other hand the postprocessing was hard. Postprocessing wants to destroy image information in the background while preserving and strengthening information in the foreground. But here we have no real background, most of the image contains the object. So i had to be really careful and limited postprocessing to an absolut minimum.

I am really happy with this one. If i look back at the first image of the orion nebula that i took back in november 2017 [https://www.astrobin.com/322849/], i am a bit proud of my progress. Back then i thought, i will never be able to shoot images as good as the ones i saw here on AstroBin. Well, of course a lot of your M 42 images are way better than this one, but this image is way beyond my own expectations i had back in 2017 when i started astroimaging and that is what counts.

Besides my philosophical thoughts, i processed the image in two [edit: three] different ways: Version A is stacked with the classical kappa sigma algorithm, while version B has seen the Entropy-Weighted-Average (HDR) one. I don't know how to perform a real HDR image (maybe i will take a look at this in the next weeks), but the differences are visible. All other postprocessing steps where similar. Version B shows way more color information (a bit too much i think) than version A, but the contrast is way better in some areas.

[Edit] I was curious and found out that doing a real HDR-image is easy with PixInsight (thanks once again to Kayron Mercieca and the great tutorials at LVA). So Version C is the one with HDR :-)

Comments

Author

khrrugh
Michael Timm
License: None (All rights reserved)
4120
Like

Revisions

  • M 42 Orion Nebula, 





    
        

            Michael Timm
    Original
  • M 42 Orion Nebula, 





    
        

            Michael Timm
    B
  • Final
    M 42 Orion Nebula, 





    
        

            Michael Timm
    C

B

Entropy-HDR stacked.

C

The real HDR-Version.

Sky plot

Sky plot

Histogram

M 42 Orion Nebula, 





    
        

            Michael Timm