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Contains:  Crescent nebula, NGC 6888
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NGC6888 The Crescent Nebula, 


            Tim McCollum
NGC6888 The Crescent Nebula

NGC6888 The Crescent Nebula

Technical card

Resolution: 4531x3360

Dates:Sept. 11, 2019Sept. 13, 2019

Baader 36mm SII 8nm Sii 36mm: 124x240" (gain: 200.00) -15C bin 1x1
Baader O3 1.25'' 8.5nm: 82x240" (gain: 200.00) -15C bin 1x1

Integration: 13.7 hours

Avg. Moon age: 13.26 days

Avg. Moon phase: 96.60%

Bortle Dark-Sky Scale: 4.00 job: 2948338

RA center: 20h 12' 7"

DEC center: +38° 20' 38"

Pixel scale: 0.849 arcsec/pixel

Orientation: 274.427 degrees

Field radius: 0.665

Data source: Backyard


NGC6888 In Bicolor HO, I also had 4 hours of Sii but there wasn't much data there so the SHO image wasn't near as good.



Tim McCollum
License: None (All rights reserved)


  • NGC6888 The Crescent Nebula, 


            Tim McCollum
  • Final
    NGC6888 The Crescent Nebula, 


            Tim McCollum


Processed as SHO to correct (somewhat) the stars, removed stars with PI StarNet, substracted Nebula from first image, then with better stars I processed the Ha + Oiii as HOO Bicolor, removed the stars again, then with pixelmath combined SHO stars and HOO nebula to arrive at this.

Sky plot

Sky plot


NGC6888 The Crescent Nebula, 


            Tim McCollum