| Object: Ngc 3945 (barred lenticular) & ngc 3978, galaxies in Ursa Major. 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 : 322 x 10' ( 53:40 ) R: 24 x 5' ( 2:00 ) G: 24 x 5' ( 2:00 ) B: 24 x 5' ( 2:00 ) Total: 59:40 hours Resolution: 0.41"/pixel. Luminance FWHM after integration: 2.1" Date: December 2024 - March 2025 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 (La Sagra images on Las Rozas images) BlurXTerminator DBE GradientCorrection SpectroPhotometric Color Calibration NoiseXTerminator GHS and Histogram stretching StarXTerminator for star masks HighDynamicRange Multiscale Transform Color saturation and Curves adjustments Local Histogram Equalization |