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I agreeImaging telescope or lens:Explore Scientific 152 mm Carbon Fiber
Imaging camera:ZWO ASI1600MM-PRO
Mount:Astro-Physics Mach 1 GTO
Guiding telescope or lens:Orion 80mm Short Tube
Guiding camera:Starlight Xpress Lodestar x2
Software:PHD2, Sequence Generator Pro, PixInsight, Stellarium, Photoshop CS5, SkySafari Pro
Filters:Astrodon Ha 5nm, Astrodon Green Tru-Balance E-Series Gen 2, Astrodon Lum Tru-Balance E-Series Gen 2, Astrodon Blue Tru-Balance E-Series Gen 2, Astrodon Red Tru-Balance E-Series Gen 2, Astrodon OIII 3nm
Accessories:QHYCCD PoleMaster, ZWO 8x 1.25" Filter Wheel (EFW), Hotech 2" SCA Self-Centering Field Flattener, MoonLite CFL 2.5" Large Format Focuser
Resolution: 2609x1842
Dates:Aug. 2, 2017, Aug. 5, 2017, May 19, 2019, May 24, 2019, June 21, 2019, June 23, 2019
Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 30x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 30x60" -20C bin 1x1
Astrodon Ha 5nm: 28x120" (gain: 139.00) -20C bin 1x1
Astrodon Ha 5nm: 154x120" (gain: 200.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 173x60" -20C bin 1x1
Astrodon OIII 3nm: 40x120" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 131x120" (gain: 200.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 30x60" -20C bin 1x1
Integration: 16.1 hours
Darks: ~50
Flats: ~50
Bias: ~250
Avg. Moon age: 16.22 days
Avg. Moon phase: 82.07%
Bortle Dark-Sky Scale: 6.00
Astrometry.net job: 2767720
RA center: 18h 53' 35"
DEC center: +33° 1' 37"
Pixel scale: 0.648 arcsec/pixel
Orientation: 129.504 degrees
Field radius: 0.287
Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States
Data source: Backyard
The Ring Nebula, M57, discovered by the French astronomer Charles Messier while searching for comets in late January 1779, is a planetary nebula in the northern constellation of Lyra. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf. M57 is 2,300 light-years from Earth. Photographs taken over a period of 50 years show the rate of nebula expansion is roughly 1 arcsecond per century. The interior parts of this nebula have a blue-green tinge that is caused by doubly ionized oxygen.
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