51 Aurigae

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51 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 38m 39.53431s[1]
Declination +39° 23′ 27.0554″[1]
Apparent magnitude (V) 5.696[2]
Spectral type K5III[2]
U−B color index +1.56[3]
B−V color index +1.34[3]
Radial velocity (Rv)31.98 ± 0.15[4] km/s
Proper motion (μ) RA: −26.77[1] mas/yr
Dec.: −110.01[1] mas/yr
Parallax (π)6.68 ± 0.66[1] mas
Distance490 ± 50 ly
(150 ± 10 pc)
Absolute magnitude (MV)0.76[5]
Mass1.58 ± 0.53[6] M
Radius19[4] R
Luminosity100[4] L
Surface gravity (log g)1.84 ± 0.11[6] cgs
Temperature4277 ± 92[6] K
Metallicity [Fe/H]0.01 ± 0.05[6] dex
Age2.2[7] Gyr
Other designations
BD+39° 1690, FK5 250, HD 47070, HIP 31771, HR 2419, SAO 59316
Database references

51 Aurigae is a star in the constellation Auriga. Its apparent magnitude is about 5.70.[2] Based on parallax, it is located some 490 light-years (150 parsecs) away from the Sun.[1]

At 2.2 billion years old,[7] 51 Aurigae has evolved off from the main sequence and is now a K-type giant star.[2] It is 1.58 times as massive as the Sun,[6] 19 times as wide, and 100 times as luminous.[4] It emits radiation with a surface temperature of about 4,277 K.[6]


  1. ^ a b c d e f 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 c d 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.
  3. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M.
  4. ^ a b c d Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  5. ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
  6. ^ a b c d e f Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal. 817: 40. arXiv:1511.04088. Bibcode:2016ApJ...817...40F. doi:10.3847/0004-637X/817/1/40.
  7. ^ a b Martig, Marie; Fouesneau, Morgan; Rix, Hans-Walter; Ness, Melissa; Mészáros, Szabolcs; García-Hernández, D. A.; Pinsonneault, Marc; Serenelli, Aldo; Aguirre, Victor Silva; Zamora, Olga (2016). "Red giant masses and ages derived from carbon and nitrogen abundances". Monthly Notices of the Royal Astronomical Society. 456 (4): 3655. arXiv:1511.08203. Bibcode:2016MNRAS.456.3655M. doi:10.1093/mnras/stv2830.