28 Aurigae

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28 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 48m 51.819s[1]
Declination +39° 32′ 01.02″[1]
Apparent magnitude (V) 6.8[2]
Spectral type G1 III-IV[3]
U−B color index +0.41[2]
B−V color index +0.81[2]
Radial velocity (Rv)20.03[1] km/s
Proper motion (μ) RA: −0.052[1] mas/yr
Dec.: −26.270[1] mas/yr
Parallax (π)5.0271 ± 0.0576[1] mas
Distance649 ± 7 ly
(199 ± 2 pc)
Absolute magnitude (MV)+0.32[3]
Radius10.18[1] R
Luminosity73[1] L
Temperature5,284[1] K
Other designations
BD+39°1416, HD 38604, HIP 27458, SAO 58460
Database references

28 Aurigae (28 Aur) is a star in the constellation Auriga. Its apparent magnitude is 6.80. It is a giant star which has exhausted its core hydrogen and expanded to ten times the size of the Sun. Despite being slightly cooler than the sun at 5,284 K it is 73 times more luminous. Its distance is known quite accurately at around 650 ly.

28 Aurigae is one of the few faint Flamsteed stars which is not in the Bright Star Catalogue.[4] It is included in the Hipparcos catalogue and its parallax was calculated to be 4.99±0.57 mas.[5] Its Gaia Data Release 2 parallax is very similar, but more precise at 5.0271±0.0576[1]


  1. ^ a b c d e f g h i j 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 Oja, T. (1984). "UBV photometry of stars whose positions are accurately known". Astronomy and Astrophysics Supplement Series. 57: 357. Bibcode:1984A&AS...57..357O.
  3. ^ a b 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.
  4. ^ Bidelman, W. P. (1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"". Bulletin d'Information du Centre de Donnees Stellaires. 38: 13. Bibcode:1990BICDS..38...13B.
  5. ^ Van Leeuwen, F. (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.