43 Aurigae

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43 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 18m 16.86513s[1]
Declination +46° 21′ 37.5926″[1]
Apparent magnitude (V) 6.33[2]
Evolutionary stage giant
Spectral type K2 III[3]
B−V color index 1.113±0.007
Radial velocity (Rv)−3.35±0.20[2] km/s
Proper motion (μ) RA: +12.111[1] mas/yr
Dec.: −130.433[1] mas/yr
Parallax (π)8.5429 ± 0.0330[1] mas
Distance382 ± 1 ly
(117.1 ± 0.5 pc)
Absolute magnitude (MV)0.92[2]
Mass1.43[4] M
Radius10.80±0.42[1] R
Luminosity49.2±0.3[1] L
Temperature4,552±62[4] K
Metallicity [Fe/H]−0.01±0.04[2] dex
Age2.7±1.3[5] Gyr
Other designations
43 Aur, BD+46°1124, GC 8055, HD 43380, HIP 29949, HR 2239, SAO 41010[6]
Database references

43 Aurigae is a star located 382 light years away from the Sun in the northern constellation of Auriga. It is just bright enough to be barely visible to the naked eye with an apparent visual magnitude of 6.33.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −3.4 km/s.[2]

This is an aging giant star with a stellar classification of K2 III,[3] having exhausted the hydrogen at its core and expanded off the main sequence. Roughly three[5] billion years old, this star has 1.43[4] times the mass of the Sun and 11[1] times the Sun's radius. It is radiating 49[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,552 K.[4]


  1. ^ a b c d e f g h i 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 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 Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
  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. ^ a b Ramya, P.; et al. (August 2016), "Chemical compositions and kinematics of the Hercules stream", Monthly Notices of the Royal Astronomical Society, 460 (2): 1356−1370, arXiv:1604.04821, Bibcode:2016MNRAS.460.1356R, doi:10.1093/mnras/stw852.
  6. ^ "43 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-23.