Alcyone (star)
Alcyone /ælˈsaɪəniː/, designated η Tauri (Eta Tauri, abbreviated Eta Tau, η Tau), is a star in the constellation of Taurus. Approximately 440 light-years from the Sun, it is the brightest star in the Pleiades open cluster, which is a young cluster, around 100 million years old. There are a number of fainter stars very close to Alcyone, some of which are members of the same cluster.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 47m 29.077s |
| Declination | 24° 06′ 18.49″ |
| Apparent magnitude (V) | 2.87 |
| Characteristics | |
| Spectral type | B5IIIe |
| U−B color index | −0.34 |
| B−V color index | −0.09 |
| Astrometry | |
| Radial velocity (Rv) | 5.40 km/s |
| Proper motion (μ) | RA: 19.34±0.39 mas/yr Dec.: −43.67±0.33 mas/yr |
| Parallax (π) | 8.09 ± 0.42 mas |
| Distance | 136 pc |
| Absolute magnitude (MV) | −2.62 |
| Details | |
| Mass | 5.9 – 6.1 M☉ |
| Radius | 9.3±0.7 R☉ |
| Luminosity | 2,030 L☉ |
| Surface gravity (log g) | 3.047 cgs |
| Temperature | 12,258 K |
| Rotational velocity (v sin i) | 149 km/s |
| Age | 70 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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