Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
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
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Crescent nebula (NGC 6888) - Part C - Ha + O-III channel with some broadband for star color

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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day before my birthday, the sky offers me a good surprise : back on the crescent nebula, after having acquired some (unpublished yet) frames in broadband with little to see in the core, here is the first 4 x 600'' @ 6400 iso...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

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

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Sky plot

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