49 Persei

49 Persei is a star in the northern constellation of Perseus. It is just visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 6.09.^[2] Based upon parallax measurements, this star is located around 147.7 light-years (45.27 parsecs) away from the Sun, but is drifting closer with a radial velocity of −44 km/s.^[2] It has a relatively large proper motion, traversing the celestial sphere at a rate of 0.220″·yr⁻¹.^[6]

49 Persei

Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	04h 08m 15.38813s[1]
Declination	+37° 43′ 38.9875″[1]
Apparent magnitude (V)	6.07[2]
Characteristics
Spectral type	K1 III[3]
B−V color index	0.943±0.003[2]
Astrometry
Radial velocity (Rv)	−44.35±0.20[2] km/s
Proper motion (μ)	RA: −98.909[1] mas/yr Dec.: −195.772[1] mas/yr
Parallax (π)	22.0897±0.0483 mas[1]
Distance	147.7 ± 0.3 ly (45.27 ± 0.10 pc)
Absolute magnitude (MV)	2.85[2]
Details
Mass	1.38[4] M☉
Radius	3.72+0.10 −0.09[1] R☉
Luminosity	7.95±0.03[1] L☉
Surface gravity (log g)	3.45[4] cgs
Temperature	5,028+61 −70[1] K
Metallicity [Fe/H]	0.02±0.04[2] dex
Age	3.93[4] Gyr
Other designations
40 Per, BD+37°881, HD 25975, HIP 19302, HR 1277, SAO 57000[5]
Database references
SIMBAD	data

This is an aging red giant star with a stellar classification of K1III, a star that has used up its core hydrogen and is expanding. It is a candidate horizontal branch star, which would indicate it is past the red giant branch stage and is fusing helium at its core.^[7] The star is nearly four^[4] billion years old with 1.4^[4] times the mass of the Sun and 3.7^[1] times the Sun's radius. It is radiating eight^[1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,028 K.^[1]