Phi Persei

φ Persei
Location of φ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 01h 43m 39.63792s[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 (Rv)+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]
Distance720 ± 30 ly
(220 ± 10 pc)
Absolute magnitude (MV)−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
Mass9.6[9] M☉
Radius5.5 - 8.0[7] R☉
Luminosity14,454[9] L☉
Surface gravity (log g)4.46[10] cgs
Temperature29,300[9] K
Rotational velocity (v sin i)440[10] km/s
B
Mass1.14[11] M☉
Radius1.3[11] R☉
Luminosity6,310[9] L☉
Surface gravity (log g)4.2[9] cgs
Temperature53,000[11] K
Age57±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
SIMBADdata

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.

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Mourard2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference gies was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference navy was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference schootemeijer2018 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Zorec2016 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference subluminous was invoked but never defined (see the help page).