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Zeta Persei

ζ Persei
Location of ζ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 54m 07.92143s[1]
Declination +31° 53′ 01.0869″[1]
Apparent magnitude (V) 2.86[2]
Characteristics
Evolutionary stage Blue supergiant
Spectral type B1 Ib[3]
U−B color index –0.72[2]
B−V color index +0.10[2]
Astrometry
Radial velocity (Rv)20.1 ± 1.2[4] km/s
Proper motion (μ) RA: +7.274 mas/yr[1]
Dec.: –9.141 mas/yr[1]
Parallax (π)3.8556 ± 0.4169 mas[1]
Distance1,300±200 ly
(400±64 pc)[5]
Absolute magnitude (MV)−4.55±0.1[6]
Details
Mass14.5 ± 1.9[7] M☉
Radius26–27[8] R☉
Luminosity47,039[7] L☉
Temperature20,800[7] K
Rotational velocity (v sin i)40[3] km/s
Age12.6 ± 1.5[9] Myr
Other designations
44 Per, FK5 144, HD 24398, HIP 18246, HR 1203, SAO 56799.[10]
Database references
SIMBADdata

Zeta Persei (ζ Per, ζ Persei) is a star in the northern constellation of Perseus. With an apparent visual magnitude of 2.9,[2] it can be readily seen with the naked eye. Parallax measurements place it at a distance of about 846 light-years (259 parsecs) from Earth,[1] though measuremets of its Ca II lines place it at 1,300 light-years (400 parsecs).[5]

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