Tau Cassiopeiae

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Template:Short description

τ Cassiopeiae
Template:Location mark
Location of τ Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cassiopeia[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +4.86[3]
Characteristics
Spectral type K1 IIIa[4]
U−B Template:Engvar +1.05[3]
B−V Template:Engvar +1.11[3]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: Script error: No such module "val".[2] mas/yr
Dec.: Script error: No such module "val".[2] mas/yr
Parallax (π)18.75±0.20 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)1.269[7]
Details
Mass1.44[8] Template:Solar mass
Radius10[6] Template:Solar radius
Luminosity40[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]Script error: No such module "val".[9] dex
Rotational velocity (v sin i)5.9[6] km/s
Age3.90[8] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Tau Cassiopeiae (τ Cassiopeiae) is a solitary,[11] 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.[3] Based upon an annual parallax shift of 18.75 mas as seen from Earth,[2] 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.[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]

Naming

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), 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 Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[13]

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Script error: No such module "citation/CS1".
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b c d Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b c d e f g h Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Template:Webarchive

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Template:Stars of Cassiopeia

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