Tau2 Eridani
| 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 ± 0.20mas |
| 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 |
Tau2 Eridani (τ2 Eri, 2 Eridani) is a star in the constellation Eridanus. It is one of a series of stars that share the Bayer designation Tau Eridani. The traditional name for this star is Angetenar, meaning "bend of the river" in Arabic. It is visible to the naked eye with an apparent visual magnitude of 4.78. The distance to τ2 Eri, as determined via the parallax method, is around 187 light years.
In Chinese, 天苑 (Tiān Yuàn), meaning Celestial Meadows, refers to an asterism consisting of τ2 Eridani, γ Eridani, π Eridani, δ Eridani, ε Eridani, ζ Eridani, η Eridani, π Ceti, τ1 Eridani, τ3 Eridani, τ4 Eridani, τ5 Eridani, τ6 Eridani, τ7 Eridani, τ8 Eridani and τ9 Eridani. Consequently, τ2 Eridani itself is known as 天苑九 (Tiān Yuàn jiǔ, English: the Ninth Star of Celestial Meadows.)
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