B-type star · blue-white star

81 UMa

81 UMa is a blue-white star in the constellation Ursa Major 299 ly from Earth. Its surface is about 10,303 K, about 1.8 times the Sun's surface temperature, and it shines at 42.03× the Sun's brightness. At magnitude 5.6 it is bright enough to see with the naked eye; the light you see left it 299 years ago.

299 lybrightness mag 5.60A0V

Also catalogued as HR 5109 · HD 118214 · HIP 66198

10,303 K

temperature

5.60

apparent magnitude

42.03× ☉

luminosity vs Sun

A0V

spectral type

Distance & comparison with our Sun

299 years

at light speed from Earth

1.78×

as hot as the Sun

42.03×

the Sun's light output

0.79

absolute magnitude

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81 UMaB-type

Sky regionUrsa Majorthis direction

Nearest stars

Bright stars in Ursa Major

Can you see it tonight?

VISIBLE TO THE NAKED EYE

Brightness mag 5.6To see it no equipment neededLook toward Ursa Major

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.