![]() ![]() Alkaid in the Big Dipper of Ursa Major. |
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Observation data Epoch J2000 Equinox J2000 |
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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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