Rho3 Arietis

Rho³ Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ρ³ Arietis, and abbreviated Rho³ Ari or ρ³ Ari. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.63.^[4] Based upon an annual parallax shift of 27.26 mas,^[9] this star is located at a distance of 120 light-years (37 parsecs) from Earth. It is drifting further away from the Sun with a radial velocity of +13.6 km/s.^[2]

For other stars with this Bayer designation, see ρ Arietis.

Rho³ Arietis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Aries[1]
Right ascension	02h 56m 26.1717s[2]
Declination	+18° 01′ 23.665″[2]
Apparent magnitude (V)	5.58[1]
Characteristics
Spectral type	F6 V[3]
U−B color index	−0.02[4]
B−V color index	+0.471±0.003[1]
V−R color index	0.3[4]
R−I color index	0.2[4]
Astrometry
Radial velocity (Rv)	+13.576±0.0016[2] km/s
Proper motion (μ)	RA: +262.027 mas/yr[2] Dec.: −231.606 mas/yr[2]
Parallax (π)	27.2557±0.1350 mas[2]
Distance	119.7 ± 0.6 ly (36.7 ± 0.2 pc)
Absolute magnitude (MV)	2.89[5]
Details
Mass	1.49[6] M☉
Luminosity	6.65[1] L☉
Surface gravity (log g)	4.19[7] cgs
Temperature	6,380[7] K
Metallicity [Fe/H]	−0.23±0.10[7] dex
Rotational velocity (v sin i)	15[8] km/s
Age	2.4[5] Gyr
Other designations
ρ3 Ari, Rho3 Arietis, Rho3 Ari, 46 Arietis, 46 Ari, BD+17 458, FK5 2204, GC 3532, HD 18256, HIP 13702, HR 869, SAO 93195, PPM 118684, LTT 10961, NLTT 9363[4]
Database references
SIMBAD	data

This is an astrometric binary system.^[10][6] The visible component is an F-type main sequence star with a stellar classification of F6 V.^[3] This star has 1.49^[6] times the mass of the Sun and is radiating 6.65^[1] times the Sun's luminosity at an effective temperature of 6,380 K.^[7] It is around 2.4 billion years old^[5] and has a lower abundance of elements other than hydrogen and helium when compared to the Sun.^[7]

Name

This star, along with δ Ari, ε Ari, ζ Ari, and π Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of Al Baṭn, the Belly.^[11] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were the title for five stars : δ Ari as Botein, π Ari as Al Buṭain I, ρ³ Ari as Al Buṭain II, ε Ari as Al Buṭain III dan ζ Ari as Al Buṭain IV^[12]