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La Superba

The red giant Y Canum Venaticorum is one of the reddest and with 2200 kelvin coolest stars in the sky. It is the second time it becomes a red giant. Its carbon-oxygen core cannot produce any more energy, but in its hull helium is still fusioning to carbon. It is surrounded by a dust disk which has been outcast by itself.

Constellation: Canes Venatici
Distance: 710 light-years
Spectral class: C7
Visual magnitude: 4.8 - 6.3
Luminosity: 4400 * Sun
Mass: circa 3 * Sun
Diameter: 215 * Sun

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Photo: ESA/ISO, PHT, H. Izumiura
La Superba with its dust disc.
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