| Object: Ngc 7331 & Stephan's Quintet, galaxies in Pegasus. Telescope: Luminance: Astrograph 400 f/4 Newton. 3" 1.15x coma corrector up to 1850mm fl). Paramount ME. ASI 6200 MM cmos. Chroma L filter. Color: Astrograph 250 f/4 Newton. Paramount ME. ATIK 16200. Chroma RGB filters Exposures: L : 357 x 10' ( 59:30 ) R: 40 x 5' ( 3:20 ) G: 40 x 5' ( 3:20 ) B: 40 x 5' ( 3:20 ) Total: 69:30 hours Resolution: 0.41"/pixel. Luminance FWHM after integration: 2.0" Date: August - December 2024 Site: Luminance: Sagan Observatory Las Rozas (Spain) - mag 4.5 suburban skies - Color: 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 |