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Tau Cassiopeiae
K-type giant star in the constellation Cassiopeia From Wikipedia, the free encyclopedia
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Tau Cassiopeiae is a solitary,[11] orange hued star in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from τ Cassiopeiae, and abbreviated Tau Cas or τ Cas. This star is bright enough to be seen with the naked eye, having an apparent visual magnitude of +4.86.[3] Based upon an annual parallax shift of 18.78 mas as seen from Earth,[2] this star is located about 173.7 light-years (53.3 pc) from the Sun. It is drifting closer with a radial velocity of −20 km/s.[6]
The spectrum of this star indicates it is an evolved, K-type giant star with a stellar classification of K1 IIIa.[4] It is a suspected variable star of unknown type.[5][12] Tau Cassiopeiae is 3.9[8] billion years old with about 1.44[8] times the mass of the Sun and 10[6] times the Sun's radius. It is radiating 40[8] times the Sun's luminosity from its expanded photosphere at an effective temperature of around 4,617 K.[8]
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Naming
In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of τ Cassiopeiae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, the Chinese name for τ Cassiopeiae itself is 螣蛇十三 (Téng Shé shísān, English: the Thirteenth Star of Flying Serpent).[13]
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References
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