Messier 57 also known as the Ring Nebula is a planetary nebula in the constellation Lyra.

This type of nebula is formed when a shell of ionized gas in expelled by a red giant star when it is passing through the final stage in becoming a white dwarf.

The nebula was discovered by French astronomer Charles Messier in January 1779.

The nebula lies at a distance of 2300 light-years and is an easy target in a moderately sized telescope.

Previous/older images:

Image data

Object info
Name M57 – The Ring Nebula
Type Planetary nebula
Constellation Lyra
Right ascension 18h 53m 35s
Declination +33° 01′ 45″
Distance 2.300 ly
Other designations NGC 6720
Image info
Image date Aug. 05, 2018
Light frames 10x 3 min. G&B (each) unbinned, 12x 6 min. 7nm Ha unbinned (R & Luminance)
Total integration 2h 12m
Dark frames 20x
Flat frames none
Bias frames 20x
Software used SGPro, PHD2 Guiding, DeepSkyStacker, Registar, Photoshop CS6
Processing Focusing and image acquisition was done using Sequence Generator Pro.
All separate frames were calibrated, aligned and stacked in DeepSkyStacker.
Images were aligned in Registar prior to combining into RGB.
Photoshop CS6 was used for further processing. High Pass filter applied.
Equipment info
Telescope Orion Optics SPX 10″ Newton
Corrector Televue 2″ Paracorr coma corrector (FL: 1.380mm f/5.43)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Astrolumina ALccd5-II (Mono)
Guide scope Vixen VMC110L f/9.4
Autoguide software PHD2 Guiding
Filters Baader 2″ 7nm Ha, Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments

Reasonably good conditions. Not much processing besides curves & level adjustments and high pass filter.