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Stars of Perseus
Epsilon Persei
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 3h 57m 51.2s
Declination 40° 0' 37"
Apparent magnitude (V) 2.90
Distance 540 ly
(165.64 pc)
Spectral type A1V
Other designations
45 Persei, HD 24760, HR 1220, SAO 56840, FK5 147, NSV 1423, BD +39 895, HIP 18532

Epsilon Persei (ε Per / ε Per) is a Class B1V, third-magnitude star in the constellation Perseus. It is, on rare occasions, called by the proper name Adid Australis, meaning "Southern One of the Upper Arm" [of the Pleiades], in Arabic.

Epsilon Persei is actually a multiple star system consisting of two main components: a blue main-sequence star of class B0.5V and a magnitude of 2.90, and a lesser white companion of class A2V and a magnitude of 3.92. The Epsilon Persei stellar system is located about 540 light-years from Earth.

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