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
Distance 296 ± 10 ly
(91 ± 3 pc)
Radius 54[5] R
Luminosity 426[6] L
Surface gravity (log g) 1.71[7] cgs
Temperature 3,990[7] K
Metallicity [Fe/H] −0.23[7] dex
Other designations
υ3 Eri, d Eri, 43 Eridani, CD−34° 1664, FK5 1121, HD 28028, HIP 20535, HR 1393, SAO 194984.[8]
Database references

Upsilon3 Eridani (υ3 Eri) is a star in the constellation 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[5] times the radius of the Sun and radiates 426[6] times the solar luminosity from its outer atmosphere at an effective temperature of 3,990 K.[7]


  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:0708.1752Freely accessible, 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, Bibcode:1982MSS...C03....0H. 
  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:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ 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/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  6. ^ 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:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  7. ^ a b c d Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069Freely accessible, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247. 
  8. ^ "d Eri -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-10-13.