gjdonatiello
Messier 57
M57
Credit: Giuseppe Donatiello
RA: 18h 53' 34" DEC: +33° 1' 33"
RA: 283,387° Dec: 33,026
The Ring Nebula (Messier 57 or NGC 6720) is a planetary nebula in Lyra and it is illuminated by a central white dwarf or planetary nebula nucleus (PNN) of 15.75 visual magnitude.
All the interior parts of this nebula have a blue-green tinge that is caused by the doubly ionized oxygen emission lines at 495.7 and 500.7 nm. In the outer region of the ring, part of the reddish hue is caused by hydrogen emission at 656.3 nm. M57 is an example of the class of planetary nebulae known as bipolar nebulae.
Messier 57
M57
Credit: Giuseppe Donatiello
RA: 18h 53' 34" DEC: +33° 1' 33"
RA: 283,387° Dec: 33,026
The Ring Nebula (Messier 57 or NGC 6720) is a planetary nebula in Lyra and it is illuminated by a central white dwarf or planetary nebula nucleus (PNN) of 15.75 visual magnitude.
All the interior parts of this nebula have a blue-green tinge that is caused by the doubly ionized oxygen emission lines at 495.7 and 500.7 nm. In the outer region of the ring, part of the reddish hue is caused by hydrogen emission at 656.3 nm. M57 is an example of the class of planetary nebulae known as bipolar nebulae.