31 Arietis

31 Arietis
Observation data; Epoch J2000 Equinox J2000
Constellation	Aries
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	5.75 (5.68 + 5.78)
Characteristics
Spectral type	F7 V + F7 V
U−B Template:Engvar	–0.05
B−V Template:Engvar	+0.47
Astrometry
Radial velocity (Rv)	+8.8 km/s
Proper motion (μ)	RA: +282.19 mas/yr ; Dec.: –86.84 mas/yr
Parallax (π)	28.79±0.43 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	2.94
Orbit
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 K
Metallicity [Fe/H]	–0.25 dex
Rotational velocity (v sin i)	5 km/s
Age	2.8 Gyr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
	BD+11 360, FK5 2179, HD 16234, HIP 12153, HR 763, SAO 93022, WDS J02366+1227.
Database references
SIMBAD	data

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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 Script error: No such module "convert".. The system is located near the ecliptic, so it is subject to occultation by the Moon.^[7] The dynamical mass of the system is Template:Solar mass.^[3]

References

Script error: No such module "Check for unknown parameters".

Observation data Epoch J2000 Equinox J2000
Constellation	Aries
Right ascension	Template:RA^[1]
Declination	Template:DEC^[1]
Apparent magnitude (V)	5.75^[2] (5.68 + 5.78)^[3]
Characteristics
Spectral type	F7 V + F7 V^[3]
U−B Template:Engvar	–0.05^[4]
B−V Template:Engvar	+0.47^[4]
Astrometry

Radial velocity (R_v)	+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	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (M_V)	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

Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
BD+11 360, FK5 2179, HD 16234, HIP 12153, HR 763, SAO 93022, WDS J02366+1227.^[4]
Database references
SIMBAD	data