Kappa Tauri
Kappa Tauri (κ Tau, κ Tauri) is a double star in the constellation Taurus, the two components κ1 Tauri and κ2 Tauri both members of the Hyades open cluster. The pair are approximately 150 light years from Earth and are separated from each other by about six light years.
| Observation data Epoch J2000.0 Equinox | |
|---|---|
| Constellation | Taurus |
| κ1 Tau | |
| Right ascension | 04h 25m 22.16505s |
| Declination | +22° 17′ 37.9375″ |
| Apparent magnitude (V) | +4.22 |
| κ2 Tau | |
| Right ascension | 04h 25m 25.01518s |
| Declination | +22° 11′ 59.9876″ |
| Apparent magnitude (V) | +5.24 |
| Characteristics | |
| κ1 Tau | |
| Spectral type | A7IV-V |
| U−B color index | +0.12 |
| B−V color index | +0.14 |
| κ2 Tau | |
| Spectral type | A7V |
| U−B color index | +0.09 |
| B−V color index | +0.17 |
| Astrometry | |
| κ1 Tau | |
| Radial velocity (Rv) | +37.30 km/s |
| Proper motion (μ) | RA: +105.10 mas/yr Dec.: −45.04 mas/yr |
| Parallax (π) | 21.19 ± 0.21 mas |
| Distance | 154 ± 2 ly (47.2 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.96 |
| κ2 Tau | |
| Radial velocity (Rv) | +32.00 km/s |
| Proper motion (μ) | RA: +111.97 mas/yr Dec.: −47.71 mas/yr |
| Parallax (π) | 22.03 ± 0.35 mas |
| Distance | 148 ± 2 ly (45.4 ± 0.7 pc) |
| Absolute magnitude (MV) | +2.18 |
| Details | |
| κ1 Tau | |
| Radius | 2.60 R☉ |
| Luminosity | 33.6 L☉ |
| Temperature | 9,000 K |
| Rotational velocity (v sin i) | 94 km/s |
| κ2 Tau | |
| Luminosity | 11.8 L☉ |
| Temperature | 7,400 K |
| Rotational velocity (v sin i) | 191 km/s |
| Other designations | |
κ Tau, ADS 3201 | |
| κ1 Tau: 65 Tauri, BD+21 642, HD 27934, HIP 20635, HR 1387, SAO 76601. | |
| κ2 Tau: 67 Tauri, BD+21 643, HD 27946, HIP 20641, HR 1388, SAO 76602. | |
| Database references | |
| SIMBAD | κ1 Tau |
| κ2 Tau | |
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