| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h48m 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]
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