Upsilon2 Eridani

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υ2 Eridani
Template:Location mark
Location of υ2 Eridani (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.804[2]
Characteristics
Evolutionary stage Red clump[3]
Spectral type G8+ III[4]
U−B Template:Engvar +0.740[2]
B−V Template:Engvar +0.968[2]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: Template:Val mas/yr[1]
Dec.: Template:Val mas/yr[1]
Parallax (π)15.4501±0.1081 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[6]
Details[6]
MassTemplate:Val Template:Solar mass
RadiusTemplate:Val Template:Solar radius
LuminosityTemplate:Val Template:Solar luminosity
Surface gravity (log g)Template:Val cgs
TemperatureTemplate:Val K
Metallicity [Fe/H]Template:Val dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Theemin, υ2 Eridani, Upsilon2 Eridani, 52 Eridani, CD−30°1901, CPD−30°631, FK5 170, GC 5614, HD 29291, HIP 21393, HR 1464, PPM 280424, SAO 195148[7]
Database references
SIMBADdata

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Upsilon2 Eridani (υ² Eridani, abbreviated Upsilon2 Eri, υ2 Eri), officially named Theemin 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 3.8.[2] Based upon parallax measurements obtained during the Gaia mission,[1] it is approximately 211 light-years distant.

It is an evolved red clump[3] giant star with a stellar classification of G8+ III.[4] The star has 3.15 times the Sun's mass and 14.09 times the Sun's radius. It radiates 114 times the solar luminosity from its outer atmosphere at an effective temperature of 5,023 K.[6]

Nomenclature

υ2 Eridani (Latinised to Upsilon2 Eridani) is the star's Bayer designation.

It bore the traditional name Theemin (also written as Theemim and Beemin).[10] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[11] to catalogue and standardize proper names for stars. The WGSN approved the name Theemin for this star on February 1, 2017, and it is now included in the List of IAU-approved Star Names.[9]

In the Almagest, Ptolemy called it hē kampē, "the bend in the river;" Arab writers corrupted this to bhmn, later becoming beemin, beemun in the West. Subsequently, its etymology was incorrectly derived from Hebrew תאומים (te'omim), meaning "twins," producing Theemin.[12][13]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Orchard, refers to an asterism consisting of Upsilon2 Eridani, Chi Eridani, Phi Eridani, Kappa Eridani, HD 16754, HD 23319, Theta Eridani, HD 24072, HD 24160, Upsilon4 Eridani, Upsilon3 Eridani and Upsilon1 Eridani.[14] Consequently, the Chinese name for Upsilon2 Eridani itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[15]

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 DR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Gutierrez-Moreno1966
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Alves2000
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Keenan1989
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Ottoni2022
  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. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hough2016
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ 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.
  15. ↑ 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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