Mu Persei

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Mu Persei
Perseus constellation map.svg
Red circle.svg

Location of μ Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 04h 14m 53.86s
Declination +48° 24' 33.7"
Apparent magnitude (V) +4.12
Distance 723 ly
(222 pc)
Spectral type G0Ib
Other designations
μ Persei, μ Per, Mu Per, 51 Persei, BD+48 1063, CCDM J04149+4824A, FK5 1117, GC 5099, HD 26630, HIP 19812, HR 1303, PPM 46912, SAO 39404, WDS J04149+4825A.
Database references

Mu Persei (Mu Per, μ Persei, μ Per) is multiple star system and in constellation of Perseus, with an apparent magnitude of +4.12. The primary component is a yellow G-type supergiant. It is approximately 723 light years from Earth. With the measured temperature as 5337 Kelvin and a radius of 53 times solar, this star has the luminosity same as 2030 times of Sun.[1]

Mu Persei is moving through the Galaxy at a speed of 35.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,900 and 32,400 light years from the center of the Galaxy.[2]

Mu Persei came closest to the Sun 5.6 million years ago when it had brightened to magnitude 3.25 from a distance of 600 light years.[2]


In Chinese, 天船 (Tiān Chuán), meaning Celestial Boat, refers to an asterism consisting of μ Persei, η Persei, γ Persei, α Persei, ψ Persei, δ Persei, 48 Persei and HD 27084. Consequently, μ Persei itself is known as 天船七 (Tiān Chuán qī, English: the Seventh Star of Celestial Boat.)[3]