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I agreeImaging telescope or lens:Skywatcher Esprit 80ED APO Triplet
Imaging camera:Atik 460EX Mono
Mount:Astro-Physics Mach1GTO
Guiding telescope or lens:Orion Deluxe Mini 50mm Guide Scope with Helical Focuser
Guiding camera:Lodestar X2
Software:Sequence Generator Pro, PixInsight 1.8
Filter:Astrodon 3nm OIII 1.25
Resolution: 1280x519
Dates:Aug. 6, 2018, Aug. 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
Astrometry.net 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.
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