(Redirected from Al Kalb al Rai )
Star in the constellation Cepheus
For other stars with this Bayer designation , see ρ Cephei .
Rho Cephei , Latinized from ρ Cephei, or simply ρ Cephei, is a solitary star in the northern constellation of Cepheus . With an apparent visual magnitude of 5.50, it is faintly visible to the naked eye, forming an optical pair with Rho Cephei . Based upon an annual parallax shift of 13.31 mas as seen from the Earth, it is located about 245 light years from the Sun .
Rho Cephei is an A-type main sequence star with a stellar classification of A3 V, estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s. The effective temperature of its photosphere is 8,511 K and its bolometric luminosity , the total amount of radiation it emits at all wavelengths, is 32 L ☉
References
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