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V509 Cassiopeiae

V509 Cas (or HD 217476 or HR 8752) is a yellow hypergiant, which semiregularly changes its brightness. It resembles to the bigger Rho Cas, which is nearly in the same direction. The state of evolution of V509 Cas is unknown. Maybe it has just started to become a red supergiant, maybe it is shortly before collapsing.

Constellation: Cassiopeia
Distance: 7800 light-years
Spectral class: G0
Visual magnitude: 5.1
Luminosity: 350 000 * Sun
Mass: 25 * Sun
Diameter: 400 * Sun

Back: List of big and giant stars part 2

02/24/2008

    V509 Cassiopeiae
Photo: ESO Online Digitized Sky Survey

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