| Object: ngc4490 &
ngc4485 (together, both known as Arp 269), galaxies
in Canes Venatici. Telescope: Luminance: Astrograph 400 f/4 Newton. Paramount ME. ASI 6200 MM cmos. Chroma Ha & Oiii filters. Color: Astrograph 250 f/4 Newton. Paramount ME. ATIK 16200 ccd. Chroma RGB filters Exposures: L : 288 x 10' ( 48:00 ) R: 25 x 5' ( 2:05 ) G: 25 x 5' ( 2:05 ) B: 25 x 5' ( 2:05 ) Total: 54:15 hour Resolution: 0.42"/pixel. Luminance FWHM after integration: 2.8" Date: January - April 2023 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 SpectroPhotometric Color Calibration BlurXTerminator Starnetv2 for star masks Histogram stretching Color saturation adjustments LRGB Combination |