Beta Arietis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Aries |
| Right ascension | 01h 54m 38.4s |
| Declination | +20° 48′ 29″ |
| Apparent magnitude (V) | 2.64 |
| Characteristics | |
| Spectral type | A5 V |
| U-B color index | 0.11 |
| B-V color index | 0.13 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | -1.9 km/s |
| Proper motion (μ) | RA: 96.32 mas/yr Dec.: -108.80 mas/yr |
| Parallax (π) | 54.74 ± 0.75 mas |
| Distance | 59.6 ly (18.3 pc) |
| Absolute magnitude (MV) | 1.33 |
| Details | |
| Mass | 2.00/1.02 M☉ |
| Radius | ? R☉ |
| Luminosity | 22 L☉ |
| Temperature | 8200 K |
| Metallicity | ? |
| Rotation | 79 km/s. |
| Age | ? years |
| Other designations | |
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.
[edit] References
- X. P. Pan et al, 1990, "Apparent orbit of the spectroscopic binary Beta ARIETIS with the time Mark III Stellar Interferometer", Astrophysical Journal, vol. 356, June 20.
[edit] External links
- Beta Arietis by Professor Jim Kaler.
- ARICNS entry
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