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Proper NameNone
Bayer DesignationMu Persei
Flamsteed Number51 Persei
HR (BSC)1303
Right Ascension4h 14m 54s
Declination+48° 24' 34"
Distance901 light years
276 parsecs
MagnitudeApparent: +4.2
Absolute: -3.1
Spectral ClassG0Ib yellow Supergiant
Optimum VisibilityDecember (Usually visible from northern latitudes)
NotesThe primary star of the Mu Persei system is an immense yellow supergiant, about fifty times the diameter of the Sun. Mu Persei is a spectroscopic binary, and the primary supergiant is known to have a companion star orbiting it over a period of 284 days.


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