28 Aurigae

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
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]
Characteristics
Spectral type G1 III-IV[3]
U−B color index +0.41[2]
B−V color index +0.81[2]
Astrometry
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]
Details
Radius10.18[1] R
Luminosity73[1] L
Temperature5,284[1] K
Other designations
BD+39°1416, HD 38604, HIP 27458, SAO 58460
Database references
SIMBADdata

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]

References

  1. 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. 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. 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 Données 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.
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