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.
| 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 |
| Distance | 649 ± 7 ly (199 ± 2 pc) |
| Absolute magnitude (MV) | +0.32[3] |
| Details | |
| Radius | 10.18[1] R☉ |
| Luminosity | 73[1] L☉ |
| Temperature | 5,284[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- 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.
- Oja, T. (1984). "UBV photometry of stars whose positions are accurately known". Astronomy and Astrophysics Supplement Series. 57: 357. Bibcode:1984A&AS...57..357O.
- 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.
- 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.
- 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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