| Object: Messier
20, the Trifid Nebula. Emission & reflection nebula in
Sagittarius. Telescope: Astrograph 250 f/4 Newton. Paramount ME. Atik 16200 ccd. Filters: Chroma LRGB, Baader H-alpha. Exposures: L : 16 x 15' ( 4:00 ) R: 30 x 10' ( 5:00 ) G: 30 x 10' ( 5:00 ) B: 30 x 10' ( 5:00 ) H-alpha: 23 x 5' ( 1:55 ) Total: 20:55 hours Resolution: 1.05"/pixel. Luminance FWHM after integration: 3.1" Date: May - July 2021 Site: La Sagra Observatory Puebla de Don Fadrique (Spain) - mag 7 professional observatory skies - |
Processing: Bias, Darks & Flat calibration Color Calibration Histogram & Curves adjustments (intensity, saturation) Software: PixInSight |