10 Arietis

10 Arietis is a binary star^[6] system in the northern constellation of Aries. 10 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with a combined apparent visual magnitude of 5.63.^[2] Based upon parallax measurements, it is located around 159 light years away from the Sun. The system is receding from the Earth with a heliocentric radial velocity of +12.9 km/s.^[3]

10 Arietis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Aries
Right ascension	02h 03m 39.34547s[1]
Declination	+25° 56′ 07.7129″[1]
Apparent magnitude (V)	5.63[2]
Characteristics
Spectral type	F8 IV + F9 V[2]
Astrometry
Radial velocity (Rv)	+12.9[3] km/s
Proper motion (μ)	RA: +128.01[1] mas/yr Dec.: +11.19[1] mas/yr
Parallax (π)	20.53±0.67 mas[1]
Distance	159 ± 5 ly (49 ± 2 pc)
Absolute magnitude (MV)	2.21[3]
Orbit[4]
Period (P)	325 yr
Semi-major axis (a)	1.39″
Eccentricity (e)	0.59
Inclination (i)	51°
Longitude of the node (Ω)	20.5°
Periastron epoch (T)	B1931.6
Argument of periastron (ω) (secondary)	165°
Details
Metallicity [Fe/H]	–0.10[3] dex
Age	1.9[3] Gyr
Other designations
10 Ari, BD+25°341, HD 12558, HIP 9621, HR 605, SAO 75114, ADS 1631, WDS 02037+2556AB[5]
Database references
SIMBAD	data

The pair orbit each other with a period of approximately 325 years and an eccentricity of 0.59. The semimajor axis of the orbit has an angular size of 1.39″.^[4] The magnitude 5.92^[6] primary, designated component A, is an aging F-type subgiant star with a stellar classification of F8 IV.^[2] The secondary star, component B, is a magnitude 7.95^[6] F-type main-sequence star with a stellar classification of F9 V.^[2] There is a magnitude 13.5 visual companion, designated component C, at an angular separation of 95.30″ along a position angle of 150°, as of 2001.^[7]