Omega Aurigae
Star in the constellation Auriga / From Wikipedia, the free encyclopedia
Omega Aurigae, Latinized from ω Aurigae, is the Bayer designation for a double star[11] in the northern constellation of Auriga. Its apparent magnitude is 4.95,[2] which is bright enough to be seen with the naked eye. The distance to this system, as determined using parallax measurements, is approximately 162 light-years (50 parsecs).[1] The system is a member of the Columba group of co-moving stars.[12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 04h 59m 15.41038s[1] |
Declination | +37° 53′ 24.8854″[1] |
Apparent magnitude (V) | 4.95[2] |
Characteristics | |
Evolutionary stage | main sequence[3] |
Spectral type | A1 V[4] |
U−B color index | +0.01[2] |
B−V color index | +0.05[2] |
R−I color index | 0.03 |
Astrometry | |
Radial velocity (Rv) | +5[5] km/s |
Proper motion (μ) | RA: +44.531[1] mas/yr Dec.: −97.943[1] mas/yr |
Parallax (π) | 20.1236 ± 0.2385 mas[1] |
Distance | 162 ± 2 ly (49.7 ± 0.6 pc) |
Absolute magnitude (MV) | +1.34[6] |
Details | |
Mass | 2.29±0.04[3] M☉ |
Radius | 2.0[7] R☉ |
Luminosity | 27[6] L☉ |
Surface gravity (log g) | 4.33[4] cgs |
Temperature | 9,230[4] K |
Metallicity [Fe/H] | –0.12[4] dex |
Rotational velocity (v sin i) | 107[8] km/s |
Age | 317[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an A-type main sequence star with a stellar classification of A1 V.[4] It is 317[9] million years old with a high rate of spin, showing a projected rotational velocity of 107 km/s.[8] The star has 2.3[3] times the mass of the Sun and double[7] the Sun's radius. It is radiating 27[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,230 K.[4] The object displays an infrared excess, suggesting an orbiting debris disk with a temperature of 20 K at a mean radius of 932.40 AU from the host star.[7] It has a magnitude 8.18 companion at an angular separation of 4.99 arcseconds.[11] The system is an X-ray source with a luminosity of 16.57×1029 ergs s−1.[13]