Tau2 Eridani
Tau2 Eridani (τ2 Eridani, abbreviated Tau2 Eri, τ2 Eri), formally named Angetenar /æŋˈɡɛtənɑːr/, is a star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.78. The distance to this star, as determined via the parallax method, is around 187 light-years.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 51m 02.32186s |
| Declination | −21° 00′ 14.4654″ |
| Apparent magnitude (V) | 4.78 |
| Characteristics | |
| Spectral type | K0 III |
| U−B color index | +0.63 |
| B−V color index | +0.92 |
| Astrometry | |
| Radial velocity (Rv) | −5.9 km/s |
| Proper motion (μ) | RA: −38.52 mas/yr Dec.: −16.05 mas/yr |
| Parallax (π) | 17.45 ± 0.20 mas |
| Distance | 187 ± 2 ly (57.3 ± 0.7 pc) |
| Absolute magnitude (MV) | 1.008 |
| Details | |
| Mass | 2.40 M☉ |
| Radius | 8.12 R☉ |
| Luminosity | 42.7 L☉ |
| Surface gravity (log g) | 2.95 cgs |
| Temperature | 5,049 K |
| Metallicity [Fe/H] | 0.08 dex |
| Rotational velocity (v sin i) | 1.11 km/s |
| Age | 660 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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