Beta Arietis
Binary star system in the constellation Aries / From Wikipedia, the free encyclopedia
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Beta Arietis (β Arietis, abbreviated Beta Ari, β Ari), officially named Sheratan /ˈʃɛrətæn/,[13][14] is a star system and the second-brightest star in the constellation of Aries, marking the ram's second horn.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 01h 54m 38.41099s[1] |
Declination | +20° 48′ 28.9133″[1] |
Apparent magnitude (V) | 2.655[2] |
Characteristics | |
Spectral type | A5 V[3] |
U−B color index | +0.170[2] |
B−V color index | +0.142[2] |
Astrometry | |
Radial velocity (Rv) | -1.9[4] km/s |
Proper motion (μ) | RA: +98.74[1] mas/yr Dec.: -110.41[1] mas/yr |
Parallax (π) | 54.74 ± 0.75 mas[1] |
Distance | 59.6 ± 0.8 ly (18.3 ± 0.3 pc) |
Absolute magnitude (MV) | 1.55 ± 0.09[5] |
Orbit[6] | |
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[6] M☉ |
Radius | 2.262[7][lower-alpha 1] R☉ |
Luminosity | 23[6] L☉ |
Surface gravity (log g) | 4.0[8] cgs |
Temperature | 9,000[8] K |
Metallicity [Fe/H] | 0.16[8] dex |
Rotational velocity (v sin i) | 73[9] km/s |
Age | 0.3[10] Gyr |
B | |
Mass | 1.34 ± 0.07[6] M☉ |
Luminosity | 1.3[6] L☉ |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
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