47 Aurigae

47 Aurigae is a star located around 680 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.88.^[2] This object is moving closer to the Earth with a heliocentric radial velocity of −48 km/s, and is expected to come to within 111 ly in around 3.6 million years.^[2]

47 Aurigae

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga
Right ascension	06h 30m 02.97400s[1]
Declination	+46° 41′ 08.0041″[1]
Apparent magnitude (V)	5.88[2]
Characteristics
Evolutionary stage	giant
Spectral type	K4 III[3]
B−V color index	1.448±0.008[2]
Astrometry
Radial velocity (Rv)	−48.32±0.20[2] km/s
Proper motion (μ)	RA: −7.582[1] mas/yr Dec.: +7.854[1] mas/yr
Parallax (π)	4.7747±0.0978 mas[1]
Distance	680 ± 10 ly (209 ± 4 pc)
Absolute magnitude (MV)	−0.47[2]
Details
Mass	1.40±0.41[4] M☉
Radius	35.9+2.5 −2.0[1] R☉
Luminosity	357.7±8.9[1] L☉
Surface gravity (log g)	1.57±0.11[4] cgs
Temperature	4,157±92[4] K
Metallicity [Fe/H]	−0.218±0.093[5] dex
Age	2.14+0.95 −0.66[4] Gyr
Other designations
47 Aur, BD+46°1149, FK5 2496, HD 45466, HIP 30972, HR 2338, SAO 41130[6]
Database references
SIMBAD	data

This object is an aging giant star with a stellar classification of K4 III,^[3] having exhausted the hydrogen supply at its core then expanded to 36^[1] times the Sun's radius. It is roughly two^[4] billion years old with 1.4^[4] times the mass of the Sun. The star is radiating 358^[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,157 K.^[4]