64 Arietis

64 Arietis is a possible binary star^[2] system in the northern constellation of Aries. 64 Arietis is the Flamsteed designation. It is faintly visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.67.^[2] Based upon an annual parallax shift of 15.2 mas,^[1] this star is approximately 214 light-years (66 parsecs) distant from the Sun. It is receding from the Earth with a heliocentric radial velocity of +8.5 km/s.^[5]

64 Arietis

Observation data Epoch J2000      Equinox J2000
Constellation	Aries
Right ascension	03h 24m 18.47709s[1]
Declination	+24° 43′ 26.7414″[1]
Apparent magnitude (V)	+5.67[2]
Characteristics
Evolutionary stage	red giant branch[3]
Spectral type	K4 III[2]
B−V color index	+1.190±0.015[4]
Astrometry
Radial velocity (Rv)	+8.49±0.09[5] km/s
Proper motion (μ)	RA: +13.781[1] mas/yr Dec.: –49.347[1] mas/yr
Parallax (π)	15.2059±0.1237 mas[1]
Distance	214 ± 2 ly (65.8 ± 0.5 pc)
Absolute magnitude (MV)	1.48[4]
Details
Mass	1.27[3] M☉
Radius	11[5] R☉
Luminosity	42[5] L☉
Surface gravity (log g)	2.5[5] cgs
Temperature	4,426[5] K
Metallicity [Fe/H]	+0.11±0.04[4] dex
Rotational velocity (v sin i)	1.4[5] km/s
Age	5.2[3] Gyr
Other designations
64 Ari, BD+24°481, HD 21017, HIP 15861, HR 1022, SAO 75912[6]
Database references
SIMBAD	data

The visible component is an aging giant star with a stellar classification of K4 III,^[2] currently on the red giant branch.^[3] It is around 5.2 billion years old with 1.27 times the mass of the Sun.^[3] With the supply of hydrogen at its core exhausted, the star has expanded to 11 times the radius of the Sun and it shines with 42 times the Sun's luminosity.^[5] This energy is being radiated from the outer envelope at an effective temperature of 4,426 K,^[5] giving it the orange-hued glow of a K-type star.