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] (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]
References
[edit]- ^ 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:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b 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, S2CID 14878976.
- ^ a b c d e Docobo, J. A.; Tamazian, V. S.; Malkov, O. Yu.; Campo, P. P.; Chulkov, D. A. (June 2016). "Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax". Monthly Notices of the Royal Astronomical Society. 459 (2): 1580–1585. arXiv:1609.03392. Bibcode:2016MNRAS.459.1580D. doi:10.1093/mnras/stw709.
- ^ a b c "31 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-14.
- ^ 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:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
- ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ^ Richichi, A.; et al. (January 2016), "Lunar Occultations of 18 Stellar Sources from the 2.4 m Thai National Telescope", The Astronomical Journal, 151 (1): 5, Bibcode:2016AJ....151...10R, doi:10.3847/0004-6256/151/1/10, S2CID 119258140, 10.
External links
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