Elnath, β Tau

Elnath is the β star in Taurus (map: top left).
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05
Declination 28° 36′ 27.494″
Apparent magnitude (V) 1.68
Characteristics
Spectral type B7III
U−B color index -0.49
B−V color index -0.13
Variable type None
Astrometry
Radial velocity (Rv) 9.2 km/s
Proper motion (μ) RA: 23.28 mas/yr
Parallax (π) 24.89 ± 0.88mas
Distance 131 ± 5 ly
(40 ± 1 pc)
Absolute magnitude (MV) -1.34
Details
Mass 5.0 ± 0.1M
Radius 4.2R
Luminosity 700L
Temperature 13,824 ± 475K
Metallicity [Fe/H] -0.10dex
Rotational velocity (v sin i) 82 km/s
Age 100 ± 10Myr
Other designations
Elnath, El Nath, Alnath, β Tau, γ Aur, 112 Tau, BD +28°795, BD+23 541, CCDM 05263+2836, FK5 202, HD 35497, HR 1791, HIP 25428, SAO 77168, GC 6681.
Database references
SIMBAD data

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This article uses material from the Wikipedia article
Alnath, which is released under the Creative Commons Attribution-Share-Alike License 3.0