Tau Cassiopeiae
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h47m03.5s |
| Declination | +58°39′07″ |
| Apparent magnitude (V) | +4.88 |
| Characteristics | |
| Spectral type | K1IIIa |
| U−B color index | +1.05 |
| B−V color index | +1.11 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | −21 km/s |
| Proper motion (μ) | RA: 60.70 mas/yr Dec.: 56.69 mas/yr |
| Parallax (π) | 18.88 ± 0.59 mas |
| Distance | 172.8 ly (53.0 pc) |
| Absolute magnitude (MV) | +1.26 |
| Other designations | |
Map of the Bayer-designated stars in Cassiopeia. Tau Cassiopeiae is circled.
Tau Cassiopeiae (τ Cas, τ Cassiopeiae) is a star in the constellation Cassiopeia. τ Cassiopeiae is an orange K-type giant with an apparent magnitude of +4.88. It is approximately 172.8 light years from Earth.
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, τ Cassiopeiae itself is known as 螣蛇十三 (Téng Shé shísān, English: the Thirteenth Star of Flying Serpent)[1]
References
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