Beta Arietis
Beta Arietis (β Arietis, abbreviated Beta Ari, β Ari), officially named Sheratan /ˈʃɛrətæn/, is a star system and the second-brightest star in the constellation of Aries, marking the ram's second horn.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 54m 38.41099s |
| Declination | +20° 48′ 28.9133″ |
| Apparent magnitude (V) | 2.655 |
| Characteristics | |
| Spectral type | A5 V |
| U−B color index | +0.170 |
| B−V color index | +0.142 |
| Astrometry | |
| Radial velocity (Rv) | -1.9 km/s |
| Proper motion (μ) | RA: +98.74 mas/yr Dec.: -110.41 mas/yr |
| Parallax (π) | 54.74 ± 0.75 mas |
| Distance | 59.6 ± 0.8 ly (18.3 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.55 ± 0.09 |
| Orbit | |
| Companion | Beta Arietis B |
| Period (P) | 106.9954 ± 0.0005 days |
| Semi-major axis (a) | 36.1 ± 0.3 mas |
| Eccentricity (e) | 0.903 ± 0.012 |
| Inclination (i) | 44.7 ± 1.3° |
| Longitude of the node (Ω) | 79.1 ± 0.8° |
| Argument of periastron (ω) (secondary) | 209.1 ± 1.2° |
| Details | |
| A | |
| Mass | 2.34 ± 0.10 M☉ |
| Luminosity | 23 L☉ |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 9,000 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotational velocity (v sin i) | 73 km/s |
| Age | 0.3 Gyr |
| B | |
| Mass | 1.34 ± 0.07 M☉ |
| Luminosity | 1.3 L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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