Omega1 Tauri is a solitary,[7] orange hued star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.51.[2] Based upon an annual parallax shift of 11.22 mas as seen from Earth,[1] it is located about 290 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Taurus |
Right ascension | 02h 12m 22.28003s[1] |
Declination | +30° 18′ 11.0430″[1] |
Apparent magnitude (V) | +5.51[2] |
Characteristics | |
Spectral type | K2 III[2] |
B−V color index | 1.077[2] |
Astrometry | |
Radial velocity (Rv) | +24.75±0.02[2] km/s |
Proper motion (μ) | RA: −65.05[1] mas/yr Dec.: −60.50[1] mas/yr |
Parallax (π) | 11.22 ± 0.70 mas[1] |
Distance | 290 ± 20 ly (89 ± 6 pc) |
Absolute magnitude (MV) | +0.76[2] |
Details | |
Mass | 1.53[3] M☉ |
Radius | 12[4] R☉ |
Luminosity | 57.5[3] L☉ |
Surface gravity (log g) | 2.5[5] cgs |
Temperature | 4,737±77[3] K |
Metallicity [Fe/H] | 0.12[5] dex |
Rotational velocity (v sin i) | 4.6[4] km/s |
Age | 4.21[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K2 III.[2] At the estimated age of 4.2 billion years,[3] it is a red clump star that is generating energy by helium fusion at its core.[5] Omega1 Tauri has about 1.5[3] times the mass of the Sun and has expanded to around 12[4] times the Sun's radius. It is radiating 57.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,737 K.[3] The radial velocity of this star shows no appreciable variation, and for this reason it is used as a radial velocity standard.[2]