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I agreeImaging telescopes or lenses:Explore Scientific ED165CF FPL-53 , Explore Scientific 152 mm Carbon Fiber
Imaging cameras:ZWO ASI1600MM-PRO , ZWO ASI1600MM-Cool
Mounts:Astro-Physics Mach 1 GTO
Guiding telescopes or lenses:Orion 80mm Short Tube
Guiding cameras:Starlight Xpress Lodestar x2
Software:Adobe Photoshop CS5.5 , PHD2 , Sequence Generator Pro , PixInsight , SkySafari Pro
Filters:Astronomik Ha 6nm 1.25'' , 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 OIII 3nm
Accessory:QHYCCD PoleMaster , Hotech 2" SCA Self-Centering Field Flattener , ZWO 8x 1.25" Filter Wheel (EFW) , MoonLite CFL 2.5" Large Format Focuser
Dates:Aug. 2, 2017 , Aug. 3, 2017 , May 19, 2019 , May 24, 2019 , June 22, 2019 , June 23, 2019 , June 29, 2020 , July 1, 2020
Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 30x60" (gain: 0.00) -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 30x60" (gain: 0.00) -20C bin 1x1
Astrodon Ha 5nm: 28x120" (gain: 139.00) -20C bin 1x1
Astrodon Ha 5nm: 154x120" (gain: 200.00) -20C
Astrodon Lum Tru-Balance E-Series Gen 2: 173x60" (gain: 0.00) -20C bin 1x1
Astrodon OIII 3nm: 40x120" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 287x120" (gain: 200.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 30x60" (gain: 0.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 274x120" (gain: 200.00) -20C bin 1x1
Integration: 30.5 hours
Darks: ~50
Flats: ~50
Bias: ~250
Avg. Moon age: 14.48 days
Avg. Moon phase: 77.48%
Bortle Dark-Sky Scale: 8.00
Astrometry.net job: 3651957
RA center: 18h 53' 26"
DEC center: +33° 2' 42"
Pixel scale: 0.284 arcsec/pixel
Orientation: 320.690 degrees
Field radius: 0.145 degrees
Resolution: 2880x2304
Data source: Backyard
This proved to be very challenging to process. This consists of three years of data; 2017, 2019 and more Ha & OIII I just captured recently. There are three different levels of stretches on the Ring Nebula itself combined in Photoshop and then added in LRGB data on top of that. It was rather hard to get the three different stretches just right where they looked natural to layer in together. I really liked how the core turned out given my 0.68"/pixel image scale, but I wish I got a little more detail around the outer shell. The outer shell was still pretty noisy and had to contend with that.
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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