| Object: Messier 81, magnificient galaxy in Ursa Maior. Telescope: Luminance: Astrograph 400 f/4 Newton. 3" 1.15x coma corrector up to 1850mm fl). Paramount ME. ASI 6200 MM cmos. Chroma L, H-alpha filters. Color: Astrograph 250 f/4 Newton. Paramount ME. ATIK 16200. Chroma RGB filters Exposures: L : 215 x 10' ( 35:50 ) H: 19 x 20' ( 6:20 ) R: 106 x 5' ( 8:50 ) G: 106 x 5' ( 8:50 ) B: 106 x 5' ( 8:50 ) Total: 68:40 hours Resolution: 0.49"/pixel. Luminance FWHM after integration: 2.3" Date: October - December 2021 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 Local Normalization DBE MLT linear noise reduction Photometric Color Calibration Starnet for star masks Deconvolution Histogram stretching HDRMultiscale Transformation Color saturation adjustments Morphological Transformation stars reduction Wavelet sharpening ACDNR noise reduction |