| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| 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 | |
Epsilon Persei (ε Per, ε Per) is a Class B1V, third-magnitude star in the constellation Perseus. 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.
The larger of the two stars has a mass 14 times that of our sun, a radius 7 times greater, a luminosity of about 25 thousand times our sun, and an estimated age of only 10 million years: massive stars have very short active life-spans. (Go to the bottom of the second external link for this and other details of the Epsilon Persei system.)
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