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I agreeImaging telescope or lens:TEC 140 APO FL
Imaging camera:Atik 460EX Mono
Mount:Astro-Physics Mach1GTO
Guiding camera:Lodestar X2
Software:Sequence Generator Pro, PixInsight 1.8
Filters:Baader Planetarium R 1.25", Baader Planetarium G 1.25", Baader Planetarium B 1.25"
Accessory:QHYCCD OFF AXIS GUIDER
Resolution: 1280x1103
Dates:June 1, 2019, June 10, 2019, June 11, 2019
Frames:
Baader Planetarium B 1.25": 7x240" bin 1x1
Baader Planetarium B 1.25": 31x180" -10C bin 1x1
Baader Planetarium G 1.25": 10x240" bin 1x1
Baader Planetarium G 1.25": 31x180" -10C bin 1x1
Baader Planetarium R 1.25": 11x240" bin 1x1
Baader Planetarium R 1.25": 28x180" -10C bin 1x1
Integration: 6.4 hours
Avg. Moon age: 14.65 days
Avg. Moon phase: 40.52%
Bortle Dark-Sky Scale: 6.00
Astrometry.net job: 2784139
RA center: 16h 41' 40"
DEC center: +36° 28' 4"
Pixel scale: 1.101 arcsec/pixel
Orientation: 286.216 degrees
Field radius: 0.258
Locations: Home, Seattle, WA, United States
Data source: Backyard
Good ol' Messier 13: a ball of several hundred thousand stars, some of which are as old as 12-13 billion years, located about 22,000 light-years away in the constellation Hercules.
This took a relatively light hand processing-wise: the usual noise reduction and a little bit of unsharp mask, but that's about all. PixInsight's Arcsinh Stretch worked well on both the RGB and synthetic luminance.
Around the time of the summer solstice, Seattle only gets 90 minutes or so of true darkness, so targets have to be bright and/or a number of nights are required to get much usable data. So, M13 is a convenient target for this time of year, though it took three nights to scoop up as much data as one could in one evening in the winter.
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