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Contains:  Ring nebula in Lyra, M 57, NGC 6720, IC 1296
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M57 • Ring Nebula in HaOIIILRGB, 


            Douglas J Struble
M57 • Ring Nebula in HaOIIILRGB

M57 • Ring Nebula in HaOIIILRGB

Technical card

Resolution: 2609x1842

Dates:Aug. 2, 2017Aug. 5, 2017May 19, 2019May 24, 2019June 21, 2019June 23, 2019

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 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.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


M57 • Ring Nebula in HaOIIILRGB, 


            Douglas J Struble