31 Arietis

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31 Arietis
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]
Spectral type F7 V[2]
U−B color index –0.05[3]
B−V color index +0.47[3]
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[1] mas
Distance 113 ± 2 ly
(34.7 ± 0.5 pc)
Absolute magnitude (MV) 2.94[4]
Temperature 6,137[4] K
Metallicity [Fe/H] –0.25[4] dex
Rotational velocity (v sin i) 5[5] km/s
Age 2.8[4] Gyr
Other designations
BD+11 360, FK5 2179, HD 16234, HIP 12153, HR 763, SAO 93022, WDS J02366+1227.[3]
Database references

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 1.924 years and an eccentricity of 0.88. The primary component is an F-type main sequence star with a stellar classification of F7 V. 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).


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  3. ^ a b c "31 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-14. 
  4. ^ a b c d Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982Freely accessible, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191. 
  5. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B. 

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