17 Persei

17 Persei is a single^[11] star in the northern constellation of Perseus, located about 420 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.53.^[2] This object is moving further from the Earth at a heliocentric radial velocity of +13 km/s.^[5]

17 Persei

Location of 17 Persei (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	02h 51m 30.83735s[1]
Declination	35° 03′ 35.0629″[1]
Apparent magnitude (V)	4.53[2]
Characteristics
Spectral type	K5+III[3]
U−B color index	+1.92[2]
B−V color index	+1.57[2]
Variable type	suspected[4]
Astrometry
Radial velocity (Rv)	+13.21[5] km/s
Proper motion (μ)	RA: +9.479 mas/yr[1] Dec.: −62.744 mas/yr[1]
Parallax (π)	7.7762±0.2018 mas[1]
Distance	420 ± 10 ly (129 ± 3 pc)
Absolute magnitude (MV)	−1.21[6]
Details
Mass	1.10±0.09[7] M☉
Radius	60.16+3.58 −4.06[8] R☉
Luminosity	848±115[8] L☉
Surface gravity (log g)	0.93±0.06[7] cgs
Temperature	4,014±51[8] K
Metallicity [Fe/H]	−0.26[6] dex
Rotational velocity (v sin i)	1.6[9] km/s
Other designations
NSV 963, BD+34°527, FK5 2198, GC 3419, HD 17709, HIP 13328, HR 843, SAO 55946[10]
Database references
SIMBAD	data

Based upon a stellar classification of K5+III,^[3] this is an evolved giant star that has exhausted the hydrogen at its core. It is a suspected variable star, with an amplitude of 0.012 magnitude and period 4.4 days.^[4][12] The star has 1.1 times the mass of the Sun^[7] and has expanded to 60 times the Sun's radius. It is radiating 848 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,014 K.^[8]