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Ring Nebula (M57)

The most famous planetary nebula and one of the most beautiful. The white dwarf in its center has a surface temperature of 100 000 - 120 000 kelvin and is slowly cooling while the nebula fades away.
The progenitor star was probably sunlike before it became a red giant and casted away its hull.

Constellation: Lyra
Distance: circa 2300 light-years

Ring Nebula

Age: 6000 - 8000 years
Visual magnitude: 8.8
Luminosity: 50 - 100 * Sun
Mass: 0.2 * Sun
Diameter: 0.9 light-years
  

The white dwarf

Age: circa 10 billion years
Visual magnitude: 14.7

Mass: 0.5 - 1.44 * Sun
Diameter: circa 1 * Earth

Back: List of Special Stars part 2 		    Ring Nebula
Photo: Nasa, Hubble Telescope
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