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Contains:  gamma Cyg nebula, IC 1318, Crescent nebula, NGC 6888, The star Sadr (γCyg)
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NGC-6888: Effect of smoke haze on O-iii, 


            Joel Shepherd
NGC-6888: Effect of smoke haze on O-iii

NGC-6888: Effect of smoke haze on O-iii

Technical card

Resolution: 1280x519

Dates:Aug. 6, 2018Aug. 7, 2018

Frames:Astrodon 3nm OIII 1.25: 2x600" bin 1x1

Integration: 0.3 hours

Avg. Moon age: 24.49 days

Avg. Moon phase: 26.29%

Bortle Dark-Sky Scale: 6.00 job: 2190530

RA center: 303.873 degrees

DEC center: 39.067 degrees

Pixel scale: 10.372 arcsec/pixel

Orientation: 33.828 degrees

Field radius: 1.990 degrees

Locations: Home, Seattle, WA, United States

Data source: Backyard


These are two images of NGC-6888 taken on two consecutive nights with identical configuration (Astrodon O-iii 3nm filter, 10 minute exposure) at the same time of the evening, and stretched identically. The higher contrast image was taken on a truly clear night. The lower contrast image was taken on a night where smoke from forest fires in California, Eastern Washington and Siberia (!) was enough to cause a noticeable haze up to 15% above the horizon but apparently daylight clear sky overhead, where NGC-6888 was positioned at the time of the exposures. Posting mostly as a piece of observational data about how even moderate amounts of smoke in the atmosphere greatly amplify light pollution.



Joel Shepherd
License: Attribution Creative Commons

Sky plot

Sky plot


NGC-6888: Effect of smoke haze on O-iii, 


            Joel Shepherd