65 Aurigae

65 Aurigae is a binary star^[7] system located 252 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange hued star with an apparent visual magnitude of 5.12.^[2] The primary, designated component A, is an aging giant star with a stellar classification of K0 III.^[3] It is 3.31^[4] billion years old and has expanded to 13 times the Sun's radius after exhausting the hydrogen at its core.^[1] Its companion, component B, is a magnitude 11.7 star located at an angular separation of 11.4″ from the primary, as of 2008.^[7] The pair are moving further from the Earth with a heliocentric radial velocity of 22 km/s.^[2]

65 Aurigae

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga
Right ascension	07h 22m 02.61744s[1]
Declination	+36° 45′ 38.0957″[1]
Apparent magnitude (V)	5.12[2]
Characteristics
Spectral type	K0 III[3]
B−V color index	1.082±0.005[2]
Astrometry
Radial velocity (Rv)	21.81±0.16[2] km/s
Proper motion (μ)	RA: −96.915[1] mas/yr Dec.: −22.436[1] mas/yr
Parallax (π)	12.9673±0.1294 mas[1]
Distance	252 ± 3 ly (77.1 ± 0.8 pc)
Absolute magnitude (MV)	0.82[2]
Details
65 Aur A
Mass	1.34[4] M☉
Radius	13.02+0.47 −2.57[1] R☉
Luminosity	69.6±0.9[1] L☉
Surface gravity (log g)	2.72[3] cgs
Temperature	4,575±17[4] K
Metallicity [Fe/H]	−0.35±0.04[2] dex
Rotational velocity (v sin i)	0.0[5] km/s
Age	3.31[4] Gyr
Other designations
65 Aur, BD+37°1707, FK5 2568, HD 57264, HIP 35710, HR 2793, SAO 60010[6]
Database references
SIMBAD	data

It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).