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Stars of Perseus
ρ Persei
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 05m 10.6s
Declination +38° 50' 25"
Apparent magnitude (V) +3.39
Distance 317 ly
(97 pc)
Spectral type M4II
Other designations
25 Per, HR 921, HD 19058, FK5 109, SAO 56138

Rho Persei (ρ Per / ρ Persei) is a star in the constellation Perseus. It has the traditional name Gorgonea Tertia.

Rho Persei is a semiregular variable star of the μ Cephei type, whose apparent magnitude varies between 3.3 and 4.0 with periods of 50 days and 1100 days. It is of spectral class M4 and is approximately 317 light years from Earth. ρ Persei has a total luminosity of some 3470 times that of the Sun while its radius is 164 times solar. The star has a mass of 3 solar masses while its surface temperature is some 3460 kelvins.

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