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Gamma Arietis

γ Arietis
Location of γ Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 53m 31.81479s[1]
Declination +19° 17′ 37.8790″[1]
Apparent magnitude (V) 3.86 (4.58/4.64)[2]
Characteristics
Gamma1 Ari (B)
Spectral type A0Vnp λ Boo[3] (A0IV-V(n)kB8)[4]
B−V color index −0.14[4]
Gamma2 Ari (A)
Spectral type A2IVpSiSrCr[5]
B−V color index −0.03[4]
Variable type α2 CVn[6]
Astrometry
Radial velocity (Rv)+3.7[7] km/s
Proper motion (μ) RA: +79.20[1] mas/yr
Dec.: −97.63[1] mas/yr
Parallax (π)19.88 ± 0.96 mas[1]
Distance164 ± 8 ly
(50 ± 2 pc)
Details
Gamma1 Ari (Ba)
Mass2.67[8] M☉
Radius2.014 R☉
Luminosity42.0 L☉
Surface gravity (log g)4.26[8] cgs
Temperature10,356[8] K
Rotational velocity (v sin i)54[9] km/s
Age34[10] Myr
Gamma2 Ari (A)
Mass2.72[8] M☉
Radius1.941[8] R☉
Luminosity41.5 L☉
Surface gravity (log g)4.30[8] cgs
Temperature10,512[8] K
Metallicity [Fe/H]0.43±0.14[11] dex
Rotational velocity (v sin i)201[9] km/s
Gamma1 Ari (Bb)
Mass0.7[10] M☉
Temperature4,312[10] K
Metallicity [Fe/H]−0.5[10] dex
Rotational velocity (v sin i)5[10] km/s
Other designations
5 Ari, BD+18 243, HIP 8832, WDS J01535+1918[12]
Gamma1 Ari (B): HD 11502, HR 545, SAO 92680, WDS J01535+1918B.
Gamma2 Ari (A): HD 11503, HR 546, SAO 92681, WDS J01535+1918A
Database references
SIMBADγ Ari
γ1 Ari (B)
γ2 Ari (A)

Gamma Arietis (γ Arietis, abbreviated Gamma Ari, γ Ari) is a binary star (possibly trinary) in the northern constellation of Aries. The two components are designated γ1 Arietis or Gamma Arietis B and γ2 Arietis or Gamma Arietis A (formally named Mesarthim /mɛˈsɑːrθɪm/, the traditional name for the Gamma Arietis system). γ1 Arietis may itself be a spectroscopic binary with a low mass companion.

The combined apparent visual magnitude of the stars is 3.86,[2] which is readily visible to the naked eye and makes this the fourth-brightest member of Aries. Based upon parallax measurements obtained during the Hipparcos mission,[1] the distance to Gamma Arietis from the Sun is approximately 164 light-years (50 parsecs).

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