| Object: HDW
3 (Haartl-Dengel-Weinberger 3), ancient planetary nebula in
Perseus. Telescope: H-alpha, OIII: Astrograph 400 f/4 Newton. Paramount ME. ASI 6200. Chroma Ha 5nm & OIII 3nm filters. Color: Astrograph 250 f/4 Newton. Paramount ME. ATIK 16200. Chroma RGB filters Exposures: H-a: 205 x 15' ( 51:15 ) Oiii: 36 x 15' ( 9:00 ) R: 20 x 10' ( 3:20 ) G: 20 x 10' ( 3:20 ) B: 20 x 10' ( 3:20 ) Total: 73:15 hours Resolution: 0.55"/pixel. FWHM after integration: Ha 1.9" Date: September 2020 - January 2021 Site: H-alpha, OIII: 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: Bias, Darks & Flat calibration DBE Photometric Color Calibration Histogram & Curves adjustments ArcSinhStretch LocalHistogramEqualization Starnet for star masks Noise reduction: ACDNR Software: PixInSight |