Gamma Arietis
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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 53m 31.81479s |
| Declination | +19° 17′ 37.8790″ |
| Apparent magnitude (V) | 3.86 (4.58/4.64) |
| Characteristics | |
| Gamma1 Ari (B) | |
| Spectral type | A0Vnp λ Boo (A0IV-V(n)kB8) |
| B−V color index | −0.14 |
| Gamma2 Ari (A) | |
| Spectral type | A2IVpSiSrCr |
| B−V color index | −0.03 |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | +3.7 km/s |
| Proper motion (μ) | RA: +79.20 mas/yr Dec.: −97.63 mas/yr |
| Parallax (π) | 19.88 ± 0.96 mas |
| Distance | 164 ± 8 ly (50 ± 2 pc) |
| Details | |
| Gamma1 Ari (Ba) | |
| Mass | 2.67 M☉ |
| Radius | 2.014 R☉ |
| Luminosity | 42.0 L☉ |
| Surface gravity (log g) | 4.26 cgs |
| Temperature | 10,356 K |
| Rotational velocity (v sin i) | 54 km/s |
| Age | 34 Myr |
| Gamma2 Ari (A) | |
| Mass | 2.72 M☉ |
| Radius | 1.941 R☉ |
| Luminosity | 41.5 L☉ |
| Surface gravity (log g) | 4.30 cgs |
| Temperature | 10,512 K |
| Metallicity [Fe/H] | 0.43±0.14 dex |
| Rotational velocity (v sin i) | 201 km/s |
| Gamma1 Ari (Bb) | |
| Mass | 0.7 M☉ |
| Temperature | 4,312 K |
| Metallicity [Fe/H] | −0.5 dex |
| Rotational velocity (v sin i) | 5 km/s |
| Other designations | |
| 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 | |
| SIMBAD | γ Ari |
| γ1 Ari (B) | |
| γ2 Ari (A) | |
The combined apparent visual magnitude of the stars is 3.86, 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, the distance to Gamma Arietis from the Sun is approximately 164 light-years (50 parsecs).
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