Omicron Aurigae
Omicron Aurigae, Latinized from ο Aurigae, is the Bayer designation for an astrometric binary star system in the northern constellation of Auriga. With an apparent visual magnitude of 5.47, it is faintly visible to the naked eye. Based upon an annual parallax shift of 7.89 ± 0.84 mas, it is approximately 413 light-years (127 parsecs) distant from Earth. The star is a member of the Ursa Major stream of co-moving stars.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 45m 54.04306s |
| Declination | +49° 49′ 34.6097″ |
| Apparent magnitude (V) | +5.47 |
| Characteristics | |
| Spectral type | A1 Cr Eu |
| U−B color index | +0.02 |
| B−V color index | +0.02 |
| Astrometry | |
| Radial velocity (Rv) | −7.7±0.9 km/s |
| Proper motion (μ) | RA: −6.97 mas/yr Dec.: −1.22 mas/yr |
| Parallax (π) | 7.89 ± 0.84 mas |
| Distance | approx. 410 ly (approx. 130 pc) |
| Absolute magnitude (MV) | −0.03 |
| Details | |
| Luminosity | 95 L☉ |
| Temperature | 8,660 K |
| Rotational velocity (v sin i) | 29 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The visible component is a chemically peculiar star with a stellar classification of A1 Cr Eu; meaning this is an A-type star with a spectrum that shows abnormally high abundances of chromium (Cr) and europium (Eu). A magnetic field has been detected and it is a source of X-ray emission with a luminosity of: log Lx = 29.1. It is spinning with a projected rotational velocity of 29 km/s and is radiating 95 times the Sun's luminosity from its photosphere at an effective temperature of 8,660 K.