65 Aurigae

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65 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  07h 22m 02.61744s[1]
Declination +36° 45′ 38.0957″[1]
Apparent magnitude (V) 5.12[2]
Spectral type K0 III[3]
B−V color index 1.082±0.005[2]
Radial velocity (Rv)21.81±0.16[2] km/s
Proper motion (μ) RA: −96.915[1] mas/yr
Dec.: −22.436[1] mas/yr
Parallax (π)12.9673 ± 0.1294[1] mas
Distance252 ± 3 ly
(77.1 ± 0.8 pc)
Absolute magnitude (MV)0.82[2]
65 Aur A
Mass1.34[4] M
[1] R
Luminosity69.6±0.9[1] L
Surface gravity (log g)2.72[3] cgs
Temperature4,575±17[4] K
Metallicity [Fe/H]−0.35±0.04[2] dex
Rotational velocity (v sin i)0.0[5] km/s
Age3.31[4] Gyr
Other designations
65 Aur, BD+37°1707, FK5 2568, HD 57264, HIP 35710, HR 2793, SAO 60010[6]
Database references

65 Aurigae is a binary star[7] system located 252 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange hued star with an apparent visual magnitude of 5.12.[2] The primary, designated component A, is an aging giant star with a stellar classification of K0 III,[3] it is 3.31[4] billion years old and has expanded to 13 times the Sun's radius after exhausting the hydrogen at its core.[1] Its companion, component B, is a magnitude 11.7 star located at an angular separation of 11.4 from the primary, as of 2008.[7] The pair are moving further from the Earth with a heliocentric radial velocity of 22 km/s.[2]


  1. ^ a b c d e f g h 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. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g 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 c Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x.
  4. ^ a b c d Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  5. ^ Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  6. ^ "65 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-25.
  7. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.

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