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Contains:  Crescent nebula, NGC 6888
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Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color

Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color

Technical card

Resolution: 2674x4099

Dates:Aug. 20, 2015

Frames: 48x600"

Integration: 8.0 hours

Avg. Moon age: 5.28 days

Avg. Moon phase: 28.37%

Astrometry.net job: 774710

RA center: 303.053 degrees

DEC center: 38.501 degrees

Orientation: -175.202 degrees

Field radius: 0.691 degrees

Locations: La Gueule du Loup (Malonne), Namur, Namur, Belgium; Le Terme, Peyzac-le-Moustier, Dordogne, France

Description

Odeceixe, one day before my birthday, the sky offers me a good surprise : back on the crescent nebula, after having acquired some (unpublished yet) frames in broadband with little to see in the core, here is the first 4 x 600'' @ 6400 iso...
> B VERSION : original Ha ;
> C VERSION : almost there : for the star background only, I blended an 10 broadband frames (no more than 25 % because of the star size much larger, and the framing not corresponding : the right part of this picture is just O-III + Ha) + last night's 6 x O-III + 6 x Ha from these two past nights :
> D VERSION = more Ha
O-III = 6 x 600'' @ 6400 iso - 50%
Ha = 12 x 600'' @ 6400 iso - 50%
Bb = 10 x 480 @ 1600 iso - on top of these 25% on the background
> F VERSION = the latest 12 x 600'' @ 6400 iso with processing (curve, level, sharpen, median, (de)saturation)
> H VERSIONS : Extra Ha 6 x 750''@3200iso + O-III 8 x 720'' @3200iso
> S-II doesn't seem to add much that I will try to add them soon...
> J VERSION :
Ha = 20 x 600''
O-III = 18 x 600''
Bb = 10 x 480'' (as before)

Comments

Author

Ewam
Ewam
License: None (All rights reserved)
7090
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Revisions

  • Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
    Original
  • Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
    E
  • Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
    F
  • Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
    H
  • Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
    J
  • Final
    Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam
    K

Sky plot

Sky plot

Histogram

Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color, 





    
        

            Ewam