Phi

Variable star

Its story

Phi Persei is one of the great Be variables of the sky: a blue star spinning at 440 km/s along its equator, so distorted by its own rotation that it has wrapped a disc of gas around its waist. A hot subdwarf companion travels with it, a shared relic of a violent binary history seven hundred light-years away.

Constellation: Perseus
Apparent magnitude: 4.01
Distance: 718.5 light years
Coordinates (J2000): RA 25.915° · Dec 50.689°
Catalogue: HIP 8068 · HD 10516

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