HD 23319

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HD 23319
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension  03h 42m 50.05587s[1]
Declination −37° 18′ 48.6740″[1]
Apparent magnitude (V) 4.59[2]
Spectral type K1.5 IIIb CN0.5[3]
B−V color index 1.191±0.002[2]
Radial velocity (Rv)+9.90±0.07[4] km/s
Proper motion (μ) RA: −91.00[1] mas/yr
Dec.: −70.67[1] mas/yr
Parallax (π)19.1851 ± 0.2267[1] mas
Distance170 ± 2 ly
(52.1 ± 0.6 pc)
Absolute magnitude (MV)0.83[2]
Mass1.18±0.18 M
Radius11.01±0.35 R
Surface gravity (log g)2.56±0.05 cgs
Temperature4,581±26 K
Metallicity [Fe/H]+0.03±0.06 dex
Rotational velocity (v sin i)1.70±0.43 km/s
Age4.57±1.83 Gyr
Other designations
h Eri, CD−37° 1415, FK5 2265, HD 23319, HIP 17351, HR 1143, SAO 194475[5]
Database references

HD 23319 (h Eridani) is an orange-hued star in the constellation Eridanus. It has an apparent visual magnitude of 4.59,[2] which is sufficiently bright to make it visible to the naked eye. The distance to HD 23319 can be estimated from its annual parallax shift of 19.2 mas,[1] which yields a range of about 170 light years. It is moving further away from the Earth with a heliocentric radial velocity of +9.9 km/s.[4]

This is an aging giant star with a stellar classification of K1.5 IIIb CN0.5,[3] where the suffix notation indicates the spectrum shows a mild overabundance of the cyano radical. It is a red clump giant, indicating it is on the horizontal branch and is generating energy through helium fusion at its core.[6] The star has 1.2 times the mass of the Sun and, at the age of 4.6 billion years, has expanded to 11 times the Sun's radius. It is radiating 63 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,581 K.[4]


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. ^ a b c d 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.
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ a b c d Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474.
  5. ^ "HD 23319". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-21.
  6. ^ Laney, C. D.; et al. (2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637, arXiv:1109.4800, Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x.