Upsilon3 Eridani

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υ³ Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension  04h 24m 02.21725s[1]
Declination −34° 01′ 00.6542″[1]
Apparent magnitude (V) 3.96[2]
Spectral type K4 III[3]
U−B color index +1.80[2]
B−V color index +1.49[2]
Radial velocity (Rv)+24.1±0.7[4] km/s
Proper motion (μ) RA: +73.77[1] mas/yr
Dec.: +56.70[1] mas/yr
Parallax (π)11.01 ± 0.37[1] mas
Distance296 ± 10 ly
(91 ± 3 pc)
Absolute magnitude (MV)−0.82[5]
Radius54[6] R
Luminosity426[7] L
Surface gravity (log g)1.71[8] cgs
Temperature3,990[8] K
Metallicity [Fe/H]−0.23[8] dex
Other designations
Beemim, υ³ Eri, d Eri, 43 Eridani, CD−34° 1664, FK5 1121, HD 28028, HIP 20535, HR 1393, SAO 194984.[9]
Database references

Upsilon³ Eridani (υ³ Eridani, abbreviated Upsilon³ Eri, υ³ Eri), officially named Beemim /ˈbməm/,[10] is a star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 3.96[2] The distance to this star, based upon an annual parallax shift of 11.01 mas,[1] is around 296 light-years.

This is an evolved K-type giant star with a stellar classification of K4 III.[3] It has about 54[6] times the radius of the Sun and radiates 426[7] times the solar luminosity from its outer atmosphere at an effective temperature of 3,990 K.[8]


υ³ Eridani (Latinised to Upsilon³ Eridani) is the star's Bayer designation.

This star bore the traditional name Beemim (also rendered Beemin, Theemim and Theemin -- see Theemin).[11][12] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the name Beemim for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[10]

In Chinese, 天園 (Tiān Yuán), meaning Celestial Orchard, refers to an asterism consisting of Upsilon³ Eridani, Chi Eridani, Phi Eridani, Kappa Eridani, HD 16754, HD 23319, Theta Eridani, HD 24072, HD 24160, Upsilon⁴ Eridani, Upsilon² Eridani and Upsilon¹ Eridani.[14] Consequently, the Chinese name for Upsilon³ Eridani itself is 天園十一 (Tiān Yuán shíyī, English: the Eleventh Star of Celestial Orchard).[15]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. ^ a b Houk, N. (1982), Michigan Catalogue of Two-dimensional Spectral Types for the HD stars, 3,
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. ^ a b c d Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247.
  9. ^ "d Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13.
  10. ^ a b "Naming Stars". Retrieved 16 December 2017.
  11. ^ Hough, Carole, ed. (2016), The Oxford Handbook of Names and Naming, Oxford University Press, p. 762, ISBN 019163042X.
  12. ^ Allen, Richard Hinkley (1963), Star Names, Their Lore and Meaning, Dover Publications Inc, p. 220, ISBN 0486210790
  13. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  14. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  15. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-09-03 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.