| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 36m 37.91730s[1] |
| Declination | +12° 26′ 51.4867″[1] |
| Apparent magnitude (V) | 5.75[2] (5.68 + 5.78)[3] |
| Characteristics | |
| Spectral type | F7 V + F7 V[3] |
| U−B color index | –0.05[4] |
| B−V color index | +0.47[4] |
| Astrometry | |
| Radial velocity (Rv) | +8.8 km/s |
| Proper motion (μ) | RA: +282.19[1] mas/yr Dec.: –86.84[1] mas/yr |
| Parallax (π) | 28.79 ± 0.43 mas[1] |
| Distance | 113 ± 2 ly (34.7 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.94[5] |
| Orbit[3] | |
| Period (P) | 3.80 ± 0.10 yr |
| Semi-major axis (a) | 0.077 ± 0.001″ |
| Eccentricity (e) | 0.017 ± 0.002 |
| Inclination (i) | 112.7 ± 0.5° |
| Longitude of the node (Ω) | 145.0 ± 0.5° |
| Periastron epoch (T) | 2010.28 ± 0.15 |
| Argument of periastron (ω) (secondary) | 3.7 ± 15.0° |
| Details | |
| Temperature | 6,137[5] K |
| Metallicity [Fe/H] | –0.25[5] dex |
| Rotational velocity (v sin i) | 5[6] km/s |
| Age | 2.8[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
31 Arietis (abbreviated 31 Ari) is a binary star in the northern constellation of Aries. 31 Arietis is the Flamsteed designation. The two members of this system orbit each other with a period of 3.80 years and an eccentricity of 0.017. Both components of the system are F-type main sequence stars with a stellar classification of F7 V.[3] The pair have an apparent visual magnitude of 5.75,[2] which is just bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 28.79 mas,[1] the distance to this system is approximately 113 light-years (35 parsecs). The system is located near the ecliptic, so it is subject to occultation by the Moon.[7] The dynamical mass of the system is 3.36 ± 0.04 M☉.[3]
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