| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 04h59m 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 | |
ω Aur, 4 Aur, BD+37°1005, HD 31647, HIP 23179, HR 1592, SAO 57548, WDS J04593+3753AB[10] | |
| Database references | |
| SIMBAD | data |
Omega Aurigae, Latinized from ω Aurigae, is the Bayer designation for a double star[11] in the northern constellationofAuriga. 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 (50parsecs).[1] The system is a member of the Columba group of co-moving stars.[12]
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]
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