Pi Persei

π Persei, Latinized as Pi Persei, is a single^[11] star in the northern constellation of Perseus. It has the traditional name Gorgonea Secunda /ɡɔːrɡəˈniːə sɪˈkʌndə/, the second of three Gorgons in the mythology of the hero Perseus.^[12] This star has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.7.^[2] It is located at a distance of approximately 303 light years from the Sun based on parallax,^[1] and is moving further away with a radial velocity of +14 km/s.^[4]

Pi Persei

Location of π Persei (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	02h 58m 45.66858s[1]
Declination	+39° 39′ 45.8212″[1]
Apparent magnitude (V)	4.70[2]
Characteristics
Spectral type	A2Vn[3]
U−B color index	+0.12[2]
B−V color index	+0.06[2]
Astrometry
Radial velocity (Rv)	+14.2[4] km/s
Proper motion (μ)	RA: +26.224[1] mas/yr Dec.: −41.899[1] mas/yr
Parallax (π)	10.7797±0.2794 mas[1]
Distance	303 ± 8 ly (93 ± 2 pc)
Absolute magnitude (MV)	−0.21[5]
Details
Mass	2.07[6] M☉
Radius	4.8[7] R☉
Luminosity	170[8] L☉
Surface gravity (log g)	3.53[6] cgs
Temperature	9,290[8] K
Rotational velocity (v sin i)	186[8] km/s
Age	272[6] Myr
Other designations
Gorgonea Secunda[9], π Per, 22 Persei, BD+39°681, FK5 2207, GC 3567, HD 18411, HIP 13879, HR 879, SAO 56047[10]
Database references
SIMBAD	data

This object is an A-type main-sequence star with a stellar classification of A2Vn,^[3] where the 'n' suffix indicates broad (nebulous) lines due to rapid rotation. It is spinning with a projected rotational velocity of 186 km/s,^[8] which is creating an equatorial bulge that is 6% wider than the polar radius.^[13] The star is 272^[6] million years old with double the mass of the Sun.^[6] It has 4.8^[7] times the Sun's radius and is radiating 170^[8] times the luminosity of the Sun from its photosphere at an effective temperature of 9,290 K.^[8]