Eta Ursae Majoris

Alkaid in the Big Dipper of Ursa Major.
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 13
Declination +49° 18′ 47.7602″
Apparent magnitude (V) +1.84
Characteristics
Spectral type B3 V
U−B color index –0.68
B−V color index –0.18
Astrometry
Radial velocity (Rv) –10.9 km/s
Proper motion (μ) RA: –121.17 mas/yr
Parallax (π) 31.38 ± 0.24mas
Distance 103.9 ± 0.8 ly
(31.9 ± 0.2 pc)
Details
Mass 6.1 ± 0.1M
Radius 3.4R
Luminosity 1,350L
Surface gravity (log g) 4.27
Temperature 16,823 ± 177K
Rotational velocity (v sin i) 150 km/s
Age 10.0 ± 2.6Myr
Other designations
Alkaid, Benetnash, Benetnasch, Elkeid, 85 Ursae Majoris, BD +50°2027, FK5 509, HD 120315, HIP 67301, HR 5191, SAO 44752.

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