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Ngc 7293 - Helix nebula
(click and scroll on the image for 4K resolution)




Object:            Ngc 7293,  the Helix planetary nebula in Aquarius.
Telescope:    
 Astrograph  250 f/4 Newton.  Paramount ME.  Artemis 4021 ccd.  Filters: Baader HORGB.
Exposures:        H :  105 x15'   (26:15 )
                          O:    60 x 15'  (15:00 ) 
                          R:    36 x 10'  (  6:00 ) 
                          G:    36 x 10'  (  6:00 )  
                          B:    36 x 10'  (  6:00 )
                             Total:    59:15 hours
Resolution:       1.1"/pixel  Halpha  FWHM after integration: 3.2".   
Date:                July 2020 - January  2021
Site:                 
La Sagra Observatory  Puebla de Don Fadrique (Spain)    - mag 7 professional observatory skies -  
Processing:
Bias, Darks & Flats calibration
Photometric Color Calibration
Deconvolution
Histogram stretching
HDRMT Dynamic range transformation
Saturation & Curves adjustmen


Software:
PixInSight