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Proper NameNone
Bayer DesignationPhi Persei
Flamsteed Number54 Andromedae
HR (BSC)496
Right Ascension1h 43m 40s
Declination+50° 41' 19"
Distance718 light years
220 parsecs
MagnitudeApparent: +4.0 to +4.1
Absolute: -2.7
Spectral ClassB2Vep blue main sequence star
Optimum VisibilityOctober / November (Usually visible from northern latitudes)
NotesThis star lies just within Perseus' formal border with Andromeda, but Flamsteed, working before the border was officially specified, placed the star in Andromeda instead (hence it is both Phi Persei and 54 Andromedae). This is an eruptive variable star with a period of just under twenty days.


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