Beta Tauri
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Pronunciation | /ɛlˈnæθ/ or /ˈɛlnæθ/ |
| Right ascension | 05h 26m 17.51312s |
| Declination | +28° 36′ 26.8262″ |
| Apparent magnitude (V) | 1.65 |
| Characteristics | |
| Spectral type | B7III |
| U−B color index | −0.49 |
| B−V color index | −0.13 |
| Astrometry | |
| Radial velocity (Rv) | 9.2 km/s |
| Proper motion (μ) | RA: +22.76 mas/yr Dec.: −173.58 mas/yr |
| Parallax (π) | 24.36±0.34 mas |
| Distance | 134 ± 2 ly (41.1 ± 0.6 pc) |
| Absolute magnitude (MV) | −1.42 |
| Details | |
| Mass | 5.0±0.1 M☉ |
| Radius | 4.79±0.13 R☉ |
| Luminosity | 564±20 L☉ |
| Surface gravity (log g) | 3.63 cgs |
| Temperature | 13,600±100 K |
| Metallicity [Fe/H] | +0.2 dex |
| Rotational velocity (v sin i) | 59 km/s |
| Age | 100±10 Myr |
| Other designations | |
| Elnath, El Nath, Alnath, β Tauri, Gamma Aurigae, 112 Tauri, BD+28°795, FK5 202, GC 6681, HD 35497, HIP 25428, HR 1791, SAO 77168, CCDM 05263+2836, WDS J05263+2836A | |
| Database references | |
| SIMBAD | data |
Beta Tauri is the second-brightest star in the constellation of Taurus. It has the official name Elnath; Beta Tauri is the current Bayer designation, which is Latinised from β Tauri and abbreviated Beta Tau or β Tau. The original designation of Gamma Aurigae is now rarely used. It is a chemically peculiar B7 giant star, 134 light years away from the Sun with an apparent magnitude of 1.65.