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NGC 7789 (Caroline's Rose)

NGC 7789 (Caroline's Rose)


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 258 frames (2h 9m)


Siril 1.2.0:

Crop to 4500 x 3600px
Photometric color calibration
Background extraction
Star desaturation
Generalized hyperbolic stretch (twice), manual histogram adjustment
Cyan/blue saturation reduction, then global saturation increase (to make star fringes less blue)

RawTherapee 5.9:

Luminance noise reduction

GIMP 2.10:

Luminance curve

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