52 Arietis

52 Arietis (abbreviated 52 Ari) is a triple star system in the northern constellation of Aries. 52 Arietis is the Flamsteed designation. The combined apparent magnitude is +5.46,^[2] which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 6.05 mas,^[1] the system is roughly 540 light-years (170 parsecs) distant from the Earth. The inner pair of this system consist of two nearly identical B-type main sequence stars, each with about five times the mass of the Sun. The tertiary component is a smaller star with 88% of the Sun's mass, and is a common proper motion companion.^[6]

52 Arietis

Observation data Epoch J2000      Equinox J2000
Constellation	Aries
Right ascension	03h 05m 26.68819s[1]
Declination	+25° 15′ 18.6257″[1]
Apparent magnitude (V)	5.46[2]
Characteristics
Spectral type	B7 V + B7 V[3]
U−B color index	-0.38[2]
B−V color index	-0.03[2]
Astrometry
Radial velocity (Rv)	9[4] km/s
Proper motion (μ)	RA: +1.44[1] mas/yr Dec.: -10.26[1] mas/yr
Parallax (π)	6.05±1.06 mas[1]
Distance	approx. 540 ly (approx. 170 pc)
Orbit
Primary	52 Ari A
Companion	52 Ari B
Period (P)	227[5] yr
Semi-major axis (a)	0.47″
Eccentricity (e)	0.73[5]
Inclination (i)	77.5°
Longitude of the node (Ω)	92.8°
Periastron epoch (T)	1938.5
Details
52 Ari A
Mass	5.12[6] M☉
Radius	3.3[7] R☉
Luminosity	452[8] L☉
Temperature	12,912[8] K
Rotational velocity (v sin i)	159[8] km/s
52 Ari B
Mass	5.12[6] M☉
Other designations
52 Arietis, ADS 2336, BD+24° 431, HIP 14376.[3]
52 Ari A: HD 19134, HR 927.
52 Ari B: HD 19135, HR 928.
Database references
SIMBAD	52 Ari
	52 Ari A
	52 Ari B