Emission nebula "Crescent" (NGC 6888, LBN 203)

Emission nebula "Crescent" (NGC 6888, LBN 203)
Result of outflows from the dying supergiant star HD 192163.
Hydrogen glow (H II) - result of ionizing radiation from the star.

Equipment:
Camera Canon EOS 200 Da.
Telescope Synta SkyWatcher 150/750, F/5
Mount HEQ-5 Pro
Bahtinov mask
Polar finder camera iOptron iPolar
Coma corrector Baader MPCC Mark III
Guider SVBONY 60/240, F/4
Guide camera ZWO ASI 120 Mini
Flat panel Gemini 190 mm

Capture software:
Astrophotography Tool, SharpCap (polar alignment), EQ-Mode, ASCOM, Cartes Du Ciel, PHD2

Suburb of Chelyabinsk, Kremenkul area, near Malinovka village
Red light pollution zone. Class 7 on the Bortle scale.

Capture 06-07.07.2026
Total 64 Light frames of 90 seconds each + 5 Dark frames + 5 Bias frames + 5 Flat frames
ISO 800

Capture 18-19.07.2026
Total 66 Light frames of 90 seconds each + 10 Dark frames + 10 Bias frames + 10 Flat frames
ISO 800

Total integration time Σ=3h15'00"

Post-processing software:
DeepSkyStacker, FitsWork, FITStacker, Lightroom, StraNet2GUI, Photoshop, Topaz Denoise AI