ATLAS (STAR)

'Atlas' is a triple star system in the Pleiades open cluster (M45). It is also known as '27 Tauri'.
The primary component, 'Atlas A', is a blue-white B-type giant with an apparent magnitude of +3.62. It is a spectroscopic binary whose components have magnitudes of +4.1 and +5.6. The binary makes one orbit every 1250 days. Atlas also has a dimmer magnitude +6.8 companion, 'Atlas B', at a separation of 0.4 arcseconds or at least 52 Astronomical Units away.

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★ Alcyone ephemeris