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HDW 3 planetary nebula

(click on the image for 4K resolution)

            


 
Object:             HDW 3 (Haartl-Dengel-Weinberger 3),  ancient planetary nebula in Perseus.
Telescopes:     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
Resolution:       0.55"/pixel.     FWHM after integration:  Ha 1.9"
Date:                September 2020 - January  2021
Sites:               
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