49 Aurigae

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49 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 30m 02.97400s[1]
Declination +46° 41′ 08.0041″[1]
Apparent magnitude (V) 5.26[2]
Evolutionary stage main sequence
Spectral type A0 Vnn[3]
B−V color index −0.008±0.006[2]
Radial velocity (Rv)+17.0±2.8[2] km/s
Proper motion (μ) RA: −7.582[1] mas/yr
Dec.: +7.854[1] mas/yr
Parallax (π)4.7747 ± 0.0978[1] mas
Distance680 ± 10 ly
(209 ± 4 pc)
Absolute magnitude (MV)−0.01[2]
Radius2.3[4] R
Luminosity3.28[2] L
Temperature8,794[5] K
Rotational velocity (v sin i)149[6] km/s
Other designations
49 Aur, BD+28°1168, FK5 2504, HD 46553, HIP 31434, HR 2398, SAO 78524[7]
Database references

49 Aurigae is a single[8] star located 680[1] light years away from the Sun in the northern constellation of Auriga.[7] It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.26.[2] The star is moving away from the Earth with a heliocentric radial velocity of +17 km/s, having come to within 149 ly some 5.5 million years ago.[2] It is positioned near the ecliptic and thus is subject to lunar occultations.[9][10]

This object is an A-type main-sequence star with a stellar classification of A0 Vnn,[3] where the 'n' notation indicates "nebulous" lines due to rapid rotation, it is spinning with a projected rotational velocity of 149 km/s.[6] This star has around 2.3[4] times the radius of the Sun and is radiating over three[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,794 K.[5]


  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. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g h 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 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. ^ a b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  5. ^ a b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  6. ^ a b Dworetsky, Michael M. (November 1974), "Rotational Velocities of a0 Stars", Astrophysical Journal Supplement, 28: 101, Bibcode:1974ApJS...28..101D, doi:10.1086/190312.
  7. ^ a b "49 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-24.
  8. ^ 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.
  9. ^ Meyer, C.; et al. (1995), "Observations of lunar occultations at Observatoire de la Cote d'Azur", Astronomy and Astrophysics Supplement, 110: 107, Bibcode:1995A&AS..110..107M.
  10. ^ Schmidtke, P. C.; Africano, J. L. (2011), "KPNO Lunar Occultation Summary. III", The Astronomical Journal, 141: 10, Bibcode:2011AJ....141...10S, doi:10.1088/0004-6256/141/1/10.