B-type star · blue-white star
Alkaid
Alkaid is a blue-white star in the constellation Ursa Major 104 ly from Earth. Its surface is about 11,556 K, about 2.0 times the Sun's surface temperature, and it shines at 161× the Sun's brightness. At magnitude 1.9 it is bright enough to see with the naked eye; the light you see left it 104 years ago.
Also catalogued as Eta UMa · HR 5191 · HD 120315 · HIP 67301
11,556 K
temperature
1.85
apparent magnitude
161× ☉
luminosity vs Sun
B3V SB
spectral type
Distance & comparison with our Sun
104 years
at light speed from Earth
2.00×
as hot as the Sun
161×
the Sun's light output
-0.67
absolute magnitude
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VISIBLE TO THE NAKED EYE
Star data from the HYG database v4.2 (Astronexus, CC BY-SA 4.0). Temperature and colour computed by gravityfinder from the B-V colour index; the illustration is generated from that temperature, not a photograph.