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- Beta_Arietis
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Beta Arietis |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aries |
| Right ascension | 01h 54m 38.4s |
| Declination | +20° 48′ 29″ |
| Apparent magnitude (V) | 2.64 |
| Characteristics | |
| Spectral type | A5V |
| U-B color index | 0.1 |
| B-V color index | 0.13 |
| R-I color index | -0.02 |
| Astrometry | |
| Radial velocity (Rv) | -1.9 km/s |
| Proper motion (μ) | RA: 96.32 mas/yr Dec.: -108.8 mas/yr |
| Parallax (π) | 54.74 ± 0.75 mas |
| Distance | 59.6 ± 0.8 ly (18.3 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.77 |
| Details | |
| Mass | 2.00/1.02 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 22 L☉ |
| Temperature | 8200 K |
| Rotation | 79 km/s 0,003689549665744 Year |
| Orbit | |
| Companion | Beta Arietis B |
| Period (P) | 0.29295 yr |
| Semimajor axis (a) | 0.0361 ± 0.0003" |
| Eccentricity (e) | 0.903 ± 0.012 ° |
| Inclination (i) | 44.7 ± 1.3° |
| Longitude of the node (Ω) | 79.1 ± 0.8° |
| Periastron epoch (T) | 209.1 ± 1.2 ° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Beta Arietis (β Ari / β Arietis) is a star in the constellation Aries, it is the Ram's second horn. It also has the traditional name Sharatan (or Sheratan or Sheratim), and the Flamsteed designation 6 Arietis.
Al Sharatan means "the two signs", a reference to the star having marked the vernal equinox together with its binary partner Gamma Arietis several thousand years ago.
It has an observed visual magnitude of +2.66. Its MK spectral type is A5V (white main sequence star). It is 59.6 light years from Earth.
This star is a spectroscopic binary. The companion orbits every 107 days with an unusually large eccentricity of 0.88. Based on the estimated mass of the companion, it is likely a G-class star.
References
- GJ 80 Catalog
- Image Beta Arietis
- Pan, X. P.; Shao, M.; Colavita, M. M.; Mozurkewich, D.; Simon, R. S.; Johnston, K. J. (1990). "Apparent orbit of the spectroscopic binary Beta ARIETIS with the time Mark III Stellar Interferometer". Astrophysical Journal 356: 641 – 645, http://adsabs.harvard.edu/abs/1990ApJ...356..641P.
External links
- Beta Arietis by Professor Jim Kaler.
- ARICNS entry
- The Constellations and Named Stars
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