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Contains:  Crescent nebula, NGC 6888
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Crescent Nebula (NGC6888)  in Cygnus HaRGB, 





    
        

            Michele Vonci
Crescent Nebula (NGC6888)  in Cygnus HaRGB

Crescent Nebula (NGC6888) in Cygnus HaRGB

Technical card

Resolution: 4631x3498

Dates:Sept. 7, 2019

Frames:
ZWO 31mm Blue Filter: 10x90" (gain: 200.00) -15C bin 1x1
ZWO 31mm Green Filter: 10x90" (gain: 200.00) -15C bin 1x1
ZWO 31mm Red Filter: 10x90" (gain: 200.00) -15C bin 1x1
ZWO H-alpha 31mm: 23x240" (gain: 200.00) -15C bin 1x1

Integration: 2.3 hours

Darks: ~10

Flats: ~20

Bias: ~40

Avg. Moon age: 8.70 days

Avg. Moon phase: 63.79%

Bortle Dark-Sky Scale: 7.00

Astrometry.net job: 2923121

RA center: 303.027 degrees

DEC center: 38.353 degrees

Pixel scale: 0.922 arcsec/pixel

Orientation: 40.496 degrees

Field radius: 0.743 degrees

Locations: Home backyard, Stockport, Cheshire, United Kingdom

Data source: Backyard

Description

Another experiment with the new monochrome camera (ASI1600MM): the Crescent Nebula #NGC6888 in the Cygnus constellation! The Cygnus is still visible despite the autumn approaching fast...and last Friday I managed to collect 2h15min of total light frames: 1.5h of H-a (23x240s) and 15min (10x90s) for each RGB channel. I processed the image with the classical HaRGB workflow, combining the R and H-a channel in a "super" red channel which is then combined with the G and B channel in a colour layer. Another layer of H-a only is then superimposed as luminance to give a highly contrasted and low-noise image. Still not happy with the overall colour though...I keep getting this pinkish tone which I don't like much...and the stars are off too...room for improvement :-)!
EDIT:Finally I've gotten a colour of the nebula and stars that I like. Also, I used darks! Specially the 300s H-a frames were in desperate need of darks to get rid of the amp glow. I used darks for the 90s RGB frames too and that allowed me to pull out more of the diffuse nebulosity around the Crescent Nebula.

Comments

Author

micvon
Michele Vonci
License: None (All rights reserved)
631
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Crescent Nebula (NGC6888)  in Cygnus HaRGB, 





    
        

            Michele Vonci