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NGC 7789 (Caroline's Rose)


NGC 7789 (Caroline's Rose)

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 258 frames (2h 9m)

Processing:

Siril 1.2.4:

Crop to 4400 x 3300px
BQ Octantis' method of white balance, background subtraction, and histogram conditioning
Star desaturation
Synthetic blue channel (B=2*G-R) to reduce blue halos on bright stars
Modified arcsinh stretch (5x)
Background extraction

RawTherapee 5.11:

L*a*b* chrominance/luminance adjustment (to reduce chrominance noise)
Luminance noise reduction

GIMP 2.10:

Luminance curve
Saturation
Levels






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