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Messier 81 (Bode's Galaxy - R) and Messier 82 (Cigar Galaxy - L)


Messier 81 (Bode's Galaxy - R) and Messier 82 (Cigar Galaxy - L)

Acquisition:

Bortle 7 skies
Nikon D5600 camera (unmodified)
ISO 200
Astro-Tech AT102ED refractor, 714mm focal length, f/7
HoTech 2" SCA field flattener (1X)
iOptron CEM26 mount
30s x 601 frames (5h)

Processing:

Siril 1.2.1:

Crop to 4400 x 3300px
BQ Octantis' procedure (starting here) of white balance, background subtraction, histogram conditioning, and black clipping
StarNet:
background: modified arcsinh stretch with even weighted luminance (5x)
stars: modified arcsinh stretch with even weighted luminance (5x)

RawTherapee 5.9:

Luminance noise reduction

GIMP 2.10:

Luminance curve
Saturation
Black
Temperature






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