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Contains:  Bode's galaxy, Bode's nebulae, Cigar galaxy, M 81, M 82, M81, M82, NGC 3031, NGC 3034
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M 81 and M 82 Ha + LRGB first test, 


            Paul Muskee
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M 81 and M 82 Ha + LRGB first test

Technical card

Dates:Jan. 20, 2019Jan. 21, 2019

Baader B Filter - 50mm: 37x120" -20C bin 1x1
Baader G Filter - 50mm: 35x120" -20C bin 1x1
Astrodon H-Alpha Filter - 3nm - 50mm: 65x200" (gain: 139.00) -20C bin 1x1
Baader L Filter - 50mm: 122x90" (gain: 10.00) -20C bin 1x1
Baader R Filter - 50mm: 34x120" -20C bin 1x1

Integration: 10.2 hours

Avg. Moon age: 14.51 days

Avg. Moon phase: 99.54%

Bortle Dark-Sky Scale: 3.00 job: 2483702

RA center: 9h 55' 33"

DEC center: +69° 16' 58"

Pixel scale: 1.143 arcsec/pixel

Orientation: -123.816 degrees

Field radius: 0.805 degrees

Resolution: 3208x3927

Locations: Lingemeer (backyard @ home), Lienden, Gelderland, Netherlands

Data source: Backyard


So I found a way to combine the Ha with the LRGB stack. Only the whole image got a bit of a red glow now but will work on that. Looking like a good base to improve on anyways!

Update: fixed the red flow by redoing color calibration.



Paul Muskee
License: None (All rights reserved)


  • M 81 and M 82 Ha + LRGB first test, 


            Paul Muskee
  • Final
    M 81 and M 82 Ha + LRGB first test, 


            Paul Muskee


Description: fixed red glow, needed to do color calibration again after adding Ha data

Sky plot

Sky plot


M 81 and M 82 Ha + LRGB first test, 


            Paul Muskee