Tau Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 55m 00.15523s[1] |
| Declination | +58° 58′ 21.7108″[1] |
| Apparent magnitude (V) | +4.86[2] |
| Characteristics | |
| Spectral type | K1 IIIa[3] |
| U−B color index | +1.05[2] |
| B−V color index | +1.11[2] |
| Variable type | Suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | −20.48±0.31[5] km/s |
| Proper motion (μ) | RA: +60.81±0.19[1] mas/yr Dec.: +56.47±0.17[1] mas/yr |
| Parallax (π) | 18.75 ± 0.20 mas[1] |
| Distance | 174 ± 2 ly (53.3 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.269[6] |
| Details | |
| Mass | 1.44[7] M☉ |
| Radius | 10[5] R☉ |
| Luminosity | 40[7] L☉ |
| Surface gravity (log g) | 2.50±0.09[8] cgs |
| Temperature | 4,617±77[7] K |
| Metallicity [Fe/H] | +0.06±0.06[8] dex |
| Rotational velocity (v sin i) | 5.9[5] km/s |
| Age | 3.90[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau Cassiopeiae (τ Cassiopeiae) is a solitary,[10] orange hued star in the northern constellation of Cassiopeia. It is bright enough to be seen with the naked eye, having an apparent visual magnitude of +4.86.[2] Based upon an annual parallax shift of 18.75 mas as seen from Earth,[1] this system is located about 174 light years from the Sun.
The spectrum of this star indicates it is an evolved, K-type giant star with a stellar classification of K1 IIIa.[3] It is a suspected variable star of unknown type.[4][11] Tau Cassiopeiae is 3.9[7] billion years old with about 1.44[7] times the mass of the Sun and 10[5] times the Sun's radius. It is radiating 40[7] times the Sun's luminosity from its expanded photosphere at an effective temperature of around 4,617 K.[7]
Naming
[edit]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).[12]
References
[edit]- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ a b c d e f g h Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2083: attempt to index a boolean value.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Archived 2011-05-21 at the Wayback Machine
