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] |
| Characteristics | |
| Spectral type | F7 V[2] |
| U−B color index | –0.05[3] |
| B−V color index | +0.47[3] |
| 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[1] mas |
| Distance | 113 ± 2 ly (34.7 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.94[4] |
| Details | |
| 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 | |
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).
References
- 1 2 3 4 5 6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- 1 2 3 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:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- 1 2 3 "31 Ari -- Double or multiple star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-14.
- 1 2 3 4 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:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
- ↑ 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.
External links
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