Hemisphere:  Northern  ·  Contains:  IC 1296  ·  M 57  ·  NGC 6720  ·  Ring nebula in Lyra
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Ring Nebula, 


Ring Nebula
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Ring Nebula

Technical card

Imaging telescopes or lenses: Celestron c14 EdgeHD Celestron C14

Imaging cameras: SBIG ST-10XME

Mounts: Astro-Physics 900 GTO

Focal reducers: Celestron Reducer 0.7x

Filters: Astrodon 3nm OIII  ·  Ha 5nm  ·  Astrodon I-series

Dates:June 8, 2019June 9, 2019June 13, 2019

Astrodon 3nm OIII: 27x900" bin 1x1
Blue: 83x120" bin 1x1
Green: 35x120" bin 1x1
Ha 5nm: 34x900" bin 1x1
Red: 43x120" bin 1x1

Integration: 20.6 hours

Avg. Moon age: 7.64 days

Avg. Moon phase: 51.90%

Basic astrometry details

Astrometry.net job: 2911244

RA center: 18h 53' 34"

DEC center: +33° 1' 44"

Pixel scale: 0.512 arcsec/pixel

Orientation: 24.703 degrees

Field radius: 0.186 degrees

Resolution: 2160x1464

Data source: Backyard


The Ring Nebula (M57) is the remnant of a dying sun-like star that is shedding shells of material into the interstellar medium. The star which formed this planetary nebula is now a white dwarf and is visible in the center of the structure. M57 is about 2,300 light-years away in the constellation Lyra.

The Ring Nebula is one of the first objects I viewed through my Tasco 4 ½ reflector many years ago, in part because its core is very bright and easily visible even from light polluted observing sites. This image is a combination of broadband RGB and narrowband Hα/OIII data. The challenge of combining the bright core with the faint outer shells discouraged me from processing this image for three months. The core is easily blown out while the signal from the outermost Hα shell is very weak. I think I am now finished and can move on to other images. Hope you like this.




Sky plot

Sky plot


Ring Nebula,