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Messier 27 (Dumbbell Nebula)


Messier 27 (Dumbbell Nebula)

Acquisition:

Bortle 7 skies
Nikon D5600 camera
ISO 200
Astro-Tech AT102ED refractor, 714mm focal length, f/7
HoTech 2" SCA field flattener (1X)
iOptron CEM26 mount
30s x 414 frames (3h 27m)

Processing:

Siril 1.2.3:

Crop to 4000 x 3000px
BQ Octantis' technique of white balance, background subtraction, and histogram conditioning
StarNet++:
Star desaturation
Background - modified asinh stretch (4X), generalized hyperbolic stretch, background extraction, GraXpert denoising (2.0.0 model), histogram adjustment
Stars - synthetic blue channel (B=2*G-R), modified asinh stretch (3X), saturation

GIMP 2.10:

Luminance curve
Saturation






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