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Star in the constellation Auriga From Wikipedia, the free encyclopedia
Omicron Aurigae, Latinized from ο Aurigae, is the Bayer designation for an astrometric binary[10] star system in the northern constellation of Auriga. With an apparent visual magnitude of 5.47,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 7.89 ± 0.84 mas,[1] 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.[11]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Auriga |
Right ascension | 05h 45m 54.04306s[1] |
Declination | +49° 49′ 34.6097″[1] |
Apparent magnitude (V) | +5.47[2] |
Characteristics | |
Spectral type | A1 Cr Eu[3] |
U−B color index | +0.02 |
B−V color index | +0.02[4] |
Astrometry | |
Radial velocity (Rv) | −7.7±0.9[5] km/s |
Proper motion (μ) | RA: −6.97[1] mas/yr Dec.: −1.22[1] mas/yr |
Parallax (π) | 7.89 ± 0.84 mas[1] |
Distance | approx. 410 ly (approx. 130 pc) |
Absolute magnitude (MV) | −0.03[6] |
Details | |
Luminosity | 95[6] L☉ |
Temperature | 8,660[7] K |
Rotational velocity (v sin i) | 29[8] 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).[3] A magnetic field has been detected and it is a source of X-ray emission with a luminosity of: log Lx = 29.1.[11] It is spinning with a projected rotational velocity of 29 km/s[8] and is radiating 95[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,660 K.[7]
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