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Contains:  Crescent nebula, NGC 6888
Getting plate-solving status, please wait...
NGC 6888, HOO, 


            Stephen Garretson
NGC 6888, HOO

NGC 6888, HOO

Technical card

Resolution: 2370x1848

Dates:May 13, 2019

Baader 3.5nm Ha filter, 2": 24x300" (gain: 139.00) -30C bin 1x1
Baader 8.5nm OIII filter, 2": 18x300" (gain: 139.00) -30C bin 1x1

Integration: 3.5 hours

Darks: ~15

Flats: ~40

Flat darks: ~15

Bias: ~40

Avg. Moon age: 8.97 days

Avg. Moon phase: 66.52%

Bortle Dark-Sky Scale: 6.00 job: 2706707

RA center: 303.024 degrees

DEC center: 38.353 degrees

Pixel scale: 0.959 arcsec/pixel

Orientation: 268.537 degrees

Field radius: 0.400 degrees

Locations: Beevo Dome [home observatory], Louisville, CO, United States

Data source: Backyard


In the process of changing setup in my observatory to run dual William Optics FLT 132 APOs, each at full focal length of 925mm. This image is from just one of those scope; still working out mount bugs.



Stephen Garretson
License: None (All rights reserved)


  • NGC 6888, HOO, 


            Stephen Garretson
  • Final
    NGC 6888, HOO, 


            Stephen Garretson


I ran deconvolution and tried to make the background blacker, my first attempt in PS on this, isolating the nebula. The transition from the nebula to the background is still too abrupt, but I am learning.

Sky plot

Sky plot


NGC 6888, HOO, 


            Stephen Garretson