Phi Persei information

φ Persei
	Location of φ Persei (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	01h 43m 39.63792s
Declination	50° 41′ 19.4328″
Apparent magnitude (V)	4.06 (3.96 - 4.11)
Characteristics
Spectral type	B2Vep + sdO
U−B color index	−0.92
B−V color index	−0.04
Variable type	γ Cas
Astrometry
Radial velocity (Rv)	+0.80 km/s
Proper motion (μ)	RA: +24.59 mas/yr ; Dec.: −14.01 mas/yr
Parallax (π)	4.54 ± 0.20 mas
Distance	720 ± 30 ly ; (220 ± 10 pc)
Absolute magnitude (MV)	−3.11
Orbit
Period (P)	126.6731 days
Semi-major axis (a)	5.89 mas
Inclination (i)	77.6°
Longitude of the node (Ω)	295.7°
Periastron epoch (T)	2456110.03
Semi-amplitude (K1); (primary)	9.97 km/s
Semi-amplitude (K2); (secondary)	81.3 km/s
Details
A
Mass	9.6 M☉
Radius	5.5 - 8.0 R☉
Luminosity	14,454 L☉
Surface gravity (log g)	4.46 cgs
Temperature	29,300 K
Rotational velocity (v sin i)	440 km/s
B
Mass	1.14 M☉
Radius	1.3 R☉
Luminosity	6,310 L☉
Surface gravity (log g)	4.2 cgs
Temperature	53,000 K
Age	57±9 Myr
Other designations
	φ Persei, φ Per, Phi Per, 54 Andromedae, BD+49°444, FK5 57, GC 2102, HD 10516, HIP 8068, HR 496, PPM 26670, SAO 22554
Database references
SIMBAD	data

Phi Persei (Phi Per, φ Persei, φ Per) is a class B2Vep fourth-magnitude star in the constellation Perseus, location about 720 light-years from Earth.

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Observation data Epoch J2000 Equinox J2000
Location of φ Persei (circled)
Constellation	Perseus
Right ascension	01^h 43^m 39.63792^s^[1]
Declination	50° 41′ 19.4328″^[1]
Apparent magnitude (V)	4.06^[2] (3.96 - 4.11^[3])
Characteristics
Spectral type	B2Vep^[4] + sdO^[5]
U−B color index	−0.92^[2]
B−V color index	−0.04^[2]
Variable type	γ Cas^[3]
Astrometry

Radial velocity (R_v)	+0.80^[6] km/s
Proper motion (μ)	RA: +24.59^[1] mas/yr Dec.: −14.01^[1] mas/yr
Parallax (π)	4.54 ± 0.20 mas^[1]
Distance	720 ± 30 ly (220 ± 10 pc)
Absolute magnitude (M_V)	−3.11^[7]

Orbit^[7]^[8]
Period (P)	126.6731 days
Semi-major axis (a)	5.89 mas
Inclination (i)	77.6°
Longitude of the node (Ω)	295.7°
Periastron epoch (T)	2456110.03
Semi-amplitude (K₁) (primary)	9.97 km/s
Semi-amplitude (K₂) (secondary)	81.3 km/s
Details
A
Mass	9.6^[9] `M`_☉
Radius	5.5 - 8.0^[7] `R`_☉
Luminosity	14,454^[9] `L`_☉
Surface gravity (log g)	4.46^[10] cgs
Temperature	29,300^[9] K
Rotational velocity (v sin i)	440^[10] km/s
B
Mass	1.14^[11] `M`_☉
Radius	1.3^[11] `R`_☉
Luminosity	6,310^[9] `L`_☉
Surface gravity (log g)	4.2^[9] cgs
Temperature	53,000^[11] K
Age	57±9^[9] Myr
Other designations
φ Persei, φ Per, Phi Per, 54 Andromedae, BD+49°444, FK5 57, GC 2102, HD 10516, HIP 8068, HR 496, PPM 26670, SAO 22554
Database references
SIMBAD	data

Phi Persei information

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