| Object:
Ngc6946 & ngc6939, galaxy and open cluster in Cepheus-Cygnus border. Telescope: Astrograph 250 f/4 Newton . Paramount ME. Atik 16200 ccd. Filters: Chroma LRGB. Exposures: L : 113 x 15' (28:15 ) R: 42 x 5' ( 3:30 ) G: 42 x 5' ( 3:30 ) B: 42 x 5' ( 3:30 ) Total: 38:45 hours Resolution: 1.05"/pixel. Luminance FWHM after integration: 2.8" Date: July - August 2024 Site: La Sagra Observatory Puebla de Don Fadrique (Spain) - mag 7 professional observatory skies - |
Processing (PixInSight): Bias, Dark & Flat calibration BlurXTerminator MultiscaleGradientCorrection SpectroPhotometric Color Calibration NoiseXTerminator GHS and Histogram stretching StarXTerminator for star masks HighDynamicRange Multiscale Transform Color saturation and Curves adjustments Local Histogram Equalization |