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]
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]