| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 03h 24m 18.47709s[1] |
| Declination | +24° 43′ 26.7414″[1] |
| Apparent magnitude (V) | +5.67[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K4 III[2] |
| B−V color index | +1.190±0.015[4] |
| Astrometry | |
| Radial velocity (Rv) | +8.49±0.09[5] km/s |
| Proper motion (μ) | RA: +13.781[1] mas/yr Dec.: –49.347[1] mas/yr |
| Parallax (π) | 15.2059 ± 0.1237 mas[1] |
| Distance | 214 ± 2 ly (65.8 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.48[4] |
| Details | |
| Mass | 1.27[3] M☉ |
| Radius | 11[5] R☉ |
| Luminosity | 42[5] L☉ |
| Surface gravity (log g) | 2.5[5] cgs |
| Temperature | 4,426[5] K |
| Metallicity [Fe/H] | +0.11±0.04[4] dex |
| Rotational velocity (v sin i) | 1.4[5] km/s |
| Age | 5.2[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
64 Arietis is a possible binary star[2] system in the northern constellation of Aries. 64 Arietis is the Flamsteed designation. It is faintly visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.67.[2] Based upon an annual parallax shift of 15.2 mas,[1] this star is approximately 214 light-years (66 parsecs) distant from the Sun. It is receding from the Earth with a heliocentric radial velocity of +8.5 km/s.[5]
The visible component is an aging giant star with a stellar classification of K4 III,[2] currently on the red giant branch.[3] It is around 5.2 billion years old with 1.27 times the mass of the Sun.[3] With the supply of hydrogen at its core exhausted, the star has expanded to 11 times the radius of the Sun and it shines with 42 times the Sun's luminosity.[5] This energy is being radiated from the outer envelope at an effective temperature of 4,426 K,[5] giving it the orange-hued glow of a K-type star.
References
[edit]- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e 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 Hekker, S.; Meléndez, J. (2007), "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters", Astronomy and Astrophysics, 475 (3): 1003, arXiv:0709.1145, Bibcode:2007A&A...475.1003H, doi:10.1051/0004-6361:20078233, S2CID 10436552.
- ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g h i Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ "* 64 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
