Tau2 Eridani

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τ2 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type K0 III[4]
U−B Template:Engvar +0.63[2]
B−V Template:Engvar +0.92[2]
Astrometry
Radial velocity (Rv)−5.9[5] km/s
Proper motion (μ) RA: −38.52[1] mas/yr
Dec.: −16.05[1] mas/yr
Parallax (π)17.45±0.20 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)1.008[3]
Details
MassTemplate:Val[6] Template:Solar mass
RadiusTemplate:Val[6] Template:Solar radius
LuminosityTemplate:Val[6] Template:Solar luminosity
Surface gravity (log g)Template:Val[5] cgs
TemperatureTemplate:Val[5] K
Metallicity [Fe/H]Template:Val[5] dex
Rotational velocity (v sin i)1.11[5] km/s
AgeTemplate:Val[6] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Angetenar, τ2 Eridani, 2 Eri, BD−21°509, HD 17824, HIP 13288, HR 850, SAO 168094[7]
Database references
SIMBADdata

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Tau2 Eridani (τ2 Eridani, abbreviated Tau2 Eri, τ2 Eri), formally named Angetenar Template:IPAc-en,[8][9] is a star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.78.[2] The distance to this star, as determined via the parallax method, is around 187 light-years.

Nomenclature

τ2 Eridani (Latinised to Tau2 Eridani) is the system's Bayer designation. It is one of a series of stars that share the Bayer designation Tau Eridani.

It bore the traditional name Angetenar, derived from the Arabic Al Ḥināyat an-Nahr, 'the Bend in the River', near which it lies.[10] In 2016, the IAU organized a Working Group on Star Names (WGSN)[11] to catalog and standardize proper names for stars. The WGSN approved the name Angetenar for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[9]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Meadows, refers to an asterism consisting of Tau2 Eridani, Gamma Eridani, Pi Eridani, Delta Eridani, Epsilon Eridani, Zeta Eridani, Eta Eridani, Pi Ceti, Tau1 Eridani, Tau3 Eridani, Tau4 Eridani, Tau5 Eridani, Tau6 Eridani, Tau7 Eridani, Tau8 Eridani and Tau9 Eridani.[12] Consequently, the Chinese name for Tau2 Eridani itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[13]

Properties

Tau2 Eridani is an evolved K-type giant star with a stellar classification of K0 III.[4] It is a red clump giant on the horizontal branch of the Hertzsprung–Russell diagram, indicating that is it now generating energy through the thermonuclear fusion of helium at its core.[3]

Around 720 million years old, Tau2 Eridani has 2.4 times the mass of the Sun and has expanded to over 8 times the solar radius. It shines with nearly 44 times the Sun's luminosity[6] from an outer atmosphere that has an effective temperature of 5,049 K.[5]

It is a member of the Galactic thin disk population.[5]

References

Template:Reflist

Template:Stars of Eridanus

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Mermilliod1986
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Liu2007
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named houk1978
  5. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named jofre2015
  6. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Gallenne2018
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  13. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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