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Beta Arietis

Beta Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 54m 38.4s
Declination +20° 48′ 29″
Apparent magnitude (V) 2.64
Spectral type A5V
U-B color index 0.1
B-V color index 0.13
R-I color index -0.02
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
Mass 2.00/1.02 M
Radius 2.1 R
Luminosity 22 L
Temperature 8200 K
Rotation 79 km/s
0,003689549665744 Year
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
Sheratan, Sharatan, Al Sharatain, 6 Arietis, Gl 80, HR 553, BD +20°306, HD 11636, GCTP 394.00, SAO 75012, FK5 66, GC 2309, CCDM 01546+2048, HIP 8903.
Database references

Beta Arietis (β Ari / β Arietis) is a star in the constellation Aries, it is the Ram's second horn. It has the traditional name Sheratan (or Sharatan, Sheratim), and the Flamsteed designation 6 Arietis.

The traditional name, in full Al Sharatan, is from the Arabic الشراطان aš-šarāţān "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.

Aries Constellation


External links



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