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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:PixInsight 1.8, Sequence Generator Pro
Filters:Astrodon 5nm H-alpha, Astrodon 1.25" 3nm SII, Astrodon 3nm OIII 1.25
Resolution: 1600x1297
Dates:July 23, 2018, July 24, 2018, Aug. 4, 2018, Aug. 7, 2018
Frames:
Astrodon 1.25" 3nm SII: 21x600" bin 1x1
Astrodon 3nm OIII 1.25: 24x600" bin 1x1
Astrodon 5nm H-alpha: 21x600" bin 1x1
Integration: 11.0 hours
Avg. Moon age: 17.38 days
Avg. Moon phase: 61.98%
Bortle Dark-Sky Scale: 6.00
Astrometry.net job: 2218966
RA center: 302.891 degrees
DEC center: 38.521 degrees
Pixel scale: 3.863 arcsec/pixel
Orientation: 33.704 degrees
Field radius: 1.105 degrees
Locations: Home, Seattle, WA, United States
Data source: Backyard
This is the first time I've imaged this target in color, and it proved a little more challenging than expected. A large part of the difficulty was, unfortunately, smoke: smoke from wildfires in British Columbia, eastern Washington, Oregon, California and even Siberia, all of which passed through Seattle at various points this month. I discarded almost 40 O-iii subs over three nights due to sheets of smoke passing through at various times.
That aside, I really like the field: the oxygen rich Crescent riding on deep red waves of hydrogen and sulfur. Rather evocative of the fires around us.
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