Beta Arietis

β Arietis
Location of β Arietis (circled)
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] (2.712 + 5.789[3])
Characteristics
Spectral type A3V + G2V[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)55.827 ± 0.308 mas[3]
Distance58.4 ± 0.3 ly
(17.91 ± 0.10 pc)
Absolute magnitude (MV)1.382 (1.444 + 4.521)[3]
Orbit[5]
CompanionBeta 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[3]
A
Mass2.067±0.057 M☉
Radius1.985 ± 0.229[a] R☉
Luminosity20.9+5.4
−4.3 L☉
Surface gravity (log g)4.0[6] cgs
Temperature8,759 K
Metallicity [Fe/H]0.16[6] dex
Rotational velocity (v sin i)73[7] km/s
Age447+261
−165 Myr
B
Mass1.058±0.026 M☉
Radius1.12 ± 0.064[a] R☉
Luminosity1.29+0.16
−0.14 L☉
Temperature5,811 K
Other designations
Sheratan, Sharatan, Al Sharatain,[8] 6 Arietis, Gl 80, HR 553, BD +20°306, HD 11636, SAO 75012, FK5 66, HIP 8903.[9]
Database references
SIMBADdata
ARICNSdata

Beta Arietis (β Arietis, abbreviated Beta Ari, β Ari), officially named Sheratan /ˈʃɛrətæn/,[10][11] is a star system and the second-brightest star in the constellation of Aries, marking the ram's second horn.

  1. ^ a b c d Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference sps1966 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference sb2 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference apj356_641 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aaass27_35 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference allen1899 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  11. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.


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