Alcyone (star)
Star system in the constellation Taurus / From Wikipedia, the free encyclopedia
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This article is about the star. For other uses, see Alcyone (disambiguation).
Alcyone /ælˈsaɪəniː/,[11] 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.[citation needed]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
Right ascension | 03h 47m 29.077s[1] |
Declination | 24° 06′ 18.49″[1] |
Apparent magnitude (V) | 2.87[2] |
Characteristics | |
Spectral type | B5IIIe[3] |
U−B color index | −0.34[2] |
B−V color index | −0.09[2] |
Astrometry | |
Radial velocity (Rv) | 5.40[4] km/s |
Proper motion (μ) | RA: 19.34±0.39[1] mas/yr Dec.: −43.67±0.33[1] mas/yr |
Parallax (π) | 8.09 ± 0.42 mas[1] |
Distance | 136[5] pc |
Absolute magnitude (MV) | −2.62[6] |
Details | |
Mass | 5.9 – 6.1[7] M☉ |
Radius | 9.3±0.7[8] R☉ |
Luminosity | 2,030[9] L☉ |
Surface gravity (log g) | 3.047[3] cgs |
Temperature | 12,258[3] K |
Rotational velocity (v sin i) | 149[3] km/s |
Age | 70[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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