  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 24m 48.79832s[1] |
| Declination | +09° 01′ 43.9306″[1] |
| Apparent magnitude (V) | 3.61[2] |
| Characteristics | |
| Spectral type | G6 III[3] |
| B−Vcolor index | +0.887±0.019[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.79±0.06[4] km/s |
| Proper motion (μ) | RA: −67.04mas/yr[5] Dec.: −78.04mas/yr[5] |
| Parallax (π) | 12.11±0.87 mas[5] |
| Distance | 270 ± 20 ly (83 ± 6 pc) |
| Absolute magnitude (MV) | −1.23[6] |
| Orbit[7] | |
| Period (P) | 1654.9 d |
| Eccentricity (e) | 0.26 |
| Periastronepoch (T) | 2429974.34 JD |
| Argument of periastron (ω) (secondary) | 155.6° |
| Semi-amplitude (K1) (primary) | 4.4 km/s |
| Details[6] | |
| ο Tauri A | |
| Mass | 3.21±0.12 M☉ |
| Radius | 20.28±3.66 R☉ |
| Luminosity | 302[8] L☉ |
| Surface gravity (log g) | 2.43±0.06 cgs |
| Temperature | 5,094±15 K |
| Metallicity[Fe/H] | −0.13±0.02 dex |
| Rotational velocity (v sin i) | 3.29±0.61 km/s |
| Age | 324+39 −35 Myr |
| Other designations | |
| ο Tau,1 Tauri,BD+08°511,FK5 121,HD 21120,HIP 15900,HR 1030,SAO 111172[1] | |
| Database references | |
| SIMBAD | data |
ο Tauri,Latinized asOmicron Tauri, is abinary star system in theconstellationTaurus, near the constellation border withCetus. It has a yellow hue and is visible to the naked eye with anapparent visual magnitude of 3.61.[2] It is approximately 270 light years from the Sun based onparallax,[5] but is drifting closer with aradial velocity of −20 km/s.[4] As the westernmost bright point of light in Taurus, this system has theFlamsteed designation 1 Tauri; Omicron Tauri is theBayer designation.[1]
This is a single-linedspectroscopic binary[7] system with the two components orbiting each other over aperiod of 4.53 years with aneccentricity of 0.263.[9] The visible component is an agingG-type giant with astellar classification of G6 III.[3] This star has three times the mass of the Sun and 20[6]–18 times the Sun's radius. Based on the latter,interferometry-measured radius, it is rotating once every 533 days.[10] It is radiating 302[8] times theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,094 K.[6]
