Omega Persei

Omega Persei (ω Persei) is a solitary,^[7] orange-hued star in the northern constellation of Perseus. The star is faintly visible to the naked eye with an apparent visual magnitude of +4.6.^[2] Based upon an annual parallax shift of 11.32 mas as seen from the Earth,^[1] the star is about 288 light years from the Sun.

Omega Persei

Location of ω Persei (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Perseus
Right ascension	03h 11m 17.38161s[1]
Declination	+39° 36′ 41.7014″[1]
Apparent magnitude (V)	+4.614[2]
Characteristics
Evolutionary stage	red clump[3]
Spectral type	K0 III[2]
B−V color index	1.122[2]
Astrometry
Radial velocity (Rv)	6.61[2] km/s
Proper motion (μ)	RA: −26.26[1] mas/yr Dec.: +5.40[1] mas/yr
Parallax (π)	11.32±0.23 mas[1]
Distance	288 ± 6 ly (88 ± 2 pc)
Absolute magnitude (MV)	−0.234[4]
Details
Mass	2.04[2] M☉
Radius	19[5] R☉
Luminosity	144.5[2] L☉
Surface gravity (log g)	2.5[5] cgs
Temperature	4,586±18[2] K
Metallicity [Fe/H]	−0.10[4] dex
Rotational velocity (v sin i)	3.3[5] km/s
Age	1.65[2] Gyr
Other designations
ω Per, 28 Persei, BD+39°724, FK5 2667, HD 19656, HIP 14817, HR 947, SAO 56224, WDS J03113+3937A[6]
Database references
SIMBAD	data

ω Persei has the traditional name Gorgonea Quarta /ɡɔːrɡəˈniːə ˈkwɔːrtə/, being the fourth member of the quartet called the Gorgonea in reference to the Gorgons from the legend of Perseus.^[8]

This is an evolved K-type giant star with a stellar classification of K0 III.^[2] It is a red clump star that is generating energy via helium fusion at its core.^[3] At the estimated age of 1.65 billion years, Omega Persei has double^[2] times the mass of the Sun and has expanded to about 19^[5] times the Sun's radius. It is radiating 144.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,586 K.^[2]