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Alkaid

Alkaid
Location of Alkaid (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 13h 47m 32.43776s[1]
Declination +49° 18′ 47.7602″[1]
Apparent magnitude (V) +1.86[2]
Characteristics
Spectral type B3 V[3]
U−B color index −0.68[2]
B−V color index −0.19[2]
Astrometry
Radial velocity (Rv)−10.9[4] km/s
Proper motion (μ) RA: −121.17[1] mas/yr
Dec.: −14.91[1] mas/yr
Parallax (π)31.38 ± 0.24 mas[1]
Distance103.9 ± 0.8 ly
(31.9 ± 0.2 pc)
Absolute magnitude (MV)−0.67[5]
Details
Mass6.1±0.1[6] M☉
Radius3.4±0.5[7] R☉
Luminosity594±31[7] L☉
Surface gravity (log g)3.78[7] cgs
Temperature15,540±1,157[7] K
Rotational velocity (v sin i)150[8] km/s
Age10.0±2.6[6] Myr
Other designations
Alkaid, Benetnash, Benetnasch,[9] Elkeid, η UMa, 85 UMa, BD+50°2027, FK5 509, GC 18643, HD 120315, HIP 67301, HR 5191, PPM 53742, SAO 44752.
Database references
SIMBADdata

Alkaid /ælˈkeɪd/, also called Eta Ursae Majoris (Latinised from η Ursae Majoris, abbreviated Eta UMa, η UMa),[10][11] is a star in the constellation of Ursa Major. It is the easternmost star in the Big Dipper (or Plough) asterism. However, unlike most stars of the Big Dipper, it is not a member of the Ursa Major moving group.[12] With an apparent visual magnitude of +1.86, it is the third-brightest star in the constellation and one of the brightest stars in the night sky.

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Alkaid

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