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Contains:  IC 1296, M 57, NGC 6720, Ring Nebula
Getting plate-solving status, please wait...

M57 • Ring Nebula in HaOIIILRGB

Technical card

Imaging 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 Lum Tru-Balance E-Series Gen 2  ·  Astrodon Green Tru-Balance E-Series Gen 2  ·  Astrodon Blue Tru-Balance E-Series Gen 2  ·  Astrodon OIII 3nm

Accessory: Hotech 2" SCA Self-Centering Field Flattener  ·  QHYCCD PoleMaster  ·  ZWO 8x 1.25" Filter Wheel (EFW)  ·  MoonLite CFL 2.5" Large Format Focuser

Dates:Aug. 2, 2017Aug. 3, 2017May 19, 2019May 24, 2019June 22, 2019June 23, 2019June 29, 2020July 1, 2020

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

Basic astrometry details 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.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


M57 • Ring Nebula in HaOIIILRGB, 


            Douglas J Struble