B-type star · blue-white star

Alkaphrah

Alkaphrah is a blue-white star in the constellation Ursa Major 358 ly from Earth. Its surface is about 10,039 K, about 1.7 times the Sun's surface temperature, and it shines at 393× the Sun's brightness. At magnitude 3.6 it is bright enough to see with the naked eye; the light you see left it 358 years ago.

358 lybrightness mag 3.57A1Vn

Also catalogued as Kappa UMa · HR 3594 · HD 77327 · HIP 44471

10,039 K

temperature

3.57

apparent magnitude

393× ☉

luminosity vs Sun

A1Vn

spectral type

Distance & comparison with our Sun

358 years

at light speed from Earth

1.74×

as hot as the Sun

393×

the Sun's light output

-1.64

absolute magnitude

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AlkaphrahB-type

Sky regionUrsa Majorthis direction

Nearest stars

Bright stars in Ursa Major

Can you see it tonight?

VISIBLE TO THE NAKED EYE

Brightness mag 3.6To 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.