The Ring Nebula (also known as M 57 or NGC 6720) is a planetary nebula visible in the boreal constellation of Lyra.
It is about 2000 light years from Earth and has a diameter of about two light years: the nebula is illuminated by a central white dwarf of magnitude 15.75.
With short photographic exposures, only the central ring structure is visible, hence the name of the nebula.
With deeper images like this, it is also possible to reveal the red-colored gaseous shell surrounding the ring structure.
Optic GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount 10Micron GM2000 HPSII
Camera ZWO ASI 2600 MM Pro with filter wheel 7 positions
Filters Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted RGB, Astrodon 50mm narrowband filters Ha 5nm and OIII 5nm
Guiding system ZWO OAG-L with guide camera ASI 174MM
Exposure details R 33x60" bin3 -20C
G 33x60" bin3 -20C
B 33x60" bin3 -20C
Ha 63x300" bin3 -15C
OIII 58x300" bin3 -15C
Total integration 11h44'
Acquisition Voyager, PHD2
Processing Pixinsight 1.8, Photoshop CS5
Location Promiod (Aosta Valley, Italy), own remote observatory
Date 23/24/26 March 2022, 24/27/30/31 July 2022