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 mas[1] |
| 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 (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]
References
- ^ 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.
- ^ 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.
- ^ 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. S2CID 119257644.
- ^ 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. S2CID 18759600.
