Alcyone D is a yellow-white F-type dwarf, 191 arcseconds from the primary. Alcyone B and Alcyone C are both 8th magnitude white A-type dwarfs and are separated from A by 117 and 181 arcseconds respectively. The binary star is orbited by three companions. It is an eclipsing binary, and the two components have a separation of 0.031 arcseconds, or about the distance from the Sun to Jupiter. Description The primary component, Alcyone A, is a blue-white B-type giant with an apparent magnitude of +2.85. It is named after the mythological figure Alcyone, one of the mythological Pleiades. Alcyone is approximately 440 light years from Earth. It is the brightest star in the Pleiades open cluster. Observation data Epoch J2000.0 Equinox J2000.0 Constellation Taurus Right ascension 03h 47m 29.1s Declination +24° 06' 18' Apparent magnitude (V) +2.85 Distance 440 ly (135 pc) Spectral type B7IIIe+A0V+A0V+F2V Other designations η Tauri, 25 Tauri, HR 1165, HD 23630, BD+23 541, FK5 139, HIP 17702, SAO 76199, GC 4541, BDS 1875, CCDM Alcyone (η Tau / η Tauri / Eta Tauri) is a star system in the constellation Taurus.
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