Tau Andromedae

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τ Andromedae
Template:Location mark
Location of τ Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.94[2]
Characteristics
Spectral type B5 III[3]
U−B Template:Engvar −0.41[2]
B−V Template:Engvar −0.09[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[4] km/s
Proper motion (μ) RA: Script error: No such module "val".[1] mas/yr
Dec.: Script error: No such module "val".[1] mas/yr
Parallax (π)4.7804±0.1304 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.73[5]
Details
Mass4.8[6] Template:Solar mass
Radius2.7[7] Template:Solar radius
Luminosity851[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[6] cgs
TemperatureScript error: No such module "val".[6] K
Rotational velocity (v sin i)Script error: No such module "val".[6] km/s
Age217[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Tau Andromedae is a single[11] star in the northern constellation of Andromeda. Its Bayer designation is Latinized from τ Andromedae, and abbreviated Tau And or τ And, respectively. The star has an apparent visual magnitude of +4.94,[2] which is bright enough to be viewed from dark suburban skies. From parallax measurements made during the Gaia mission, the distance to this star can be estimated as roughly Script error: No such module "convert". from Earth. The brightness of this star is diminished by 0.24 in magnitude due to extinction caused by intervening gas and dust.[3] It is drifting closer to the Sun with a radial velocity of −14 km/s.[4]

The spectrum of this star matches a stellar classification of B5 III,[3] with the luminosity class of III indicating that this is a giant star. It is radiating about 851 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 12,670 K.[6] The star is an estimated 217[9] million years old and is spinning with a high projected rotational velocity of ~74 km/s.[6]

Naming

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Heaven's Great General, refers to an asterism consisting of τ Andromedae, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, the Chinese name for τ Andromedae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.).[12]

References

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  1. ↑ a b c d e Template:Cite Gaia EDR3
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ a b c Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b c d e f Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b 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. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日 Script error: No such module "webarchive".

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External links

Template:Stars of Andromeda

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