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CW Leonis

The pulsating red giant once was surrounded by billions of comets. Due to its expansion these now melt to water, which we can measure quite good from earth. The star's temperature is yet just 2300 kelvin. It will die in maybe 10 000 - 30 000 years and then be a planetary nebula and a white dwarf.
The spectral class C refers to its extremely high content of carbon. Otherwise it would be an M star.

Constellation: Leo
Distance: 650 light-years
Spectral class: C9.5
Visual magnitude: 10.96 - 14.8
Luminosity: 20 000 * Sun
Mass: 1.5 - 4 * Sun
Diameter: 500 * Sun

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    CW Leonis
Graphic: Smithsonian Astrophysical Observatory

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