15 Eridani

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15 Eridani
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 03h 18m 22.10504s[1]
Declination −22° 30′ 40.0191″[1]
Apparent magnitude (V) 4.875[2]
(6.57 / 5.32)[3]
Spectral type K0III[4]
B−V color index +0.90[5]
Radial velocity (Rv)23.90 ± 0.5[6] km/s
Proper motion (μ) RA: 13.08[1] mas/yr
Dec.: 13.33[1] mas/yr
Parallax (π)12.77 ± 1.17[1] mas
Distance260 ± 20 ly
(78 ± 7 pc)
Absolute magnitude (MV)+0.85[7]
Period (P)118.16 yr
Semi-major axis (a)0.340″
Eccentricity (e)0.030
Inclination (i)66.6°
Longitude of the node (Ω)271.6°
Periastron epoch (T)1934.24
Argument of periastron (ω)
Temperature5,047[7] K
Rotational velocity (v sin i)4.5±0.2[7] km/s
Other designations
CD−22° 1146, HD 20610, HIP 15382, HR 994, SAO 168452
Database references

15 Eridani (15 Eri) is a binary star in the constellation Eridanus. Its apparent magnitude is 4.875.[2]


  1. ^ a b c d e van Leeuwen, F.; et al. (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 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 11 August 2017.
  4. ^ Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. 4. Bibcode:1988mcts.book.....H.
  5. ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  6. ^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
  7. ^ a b c Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.