B-type star · blue-white star

31 Per

31 Per is a blue-white star in the constellation Perseus 560 ly from Earth. Its surface is about 11,046 K, about 1.9 times the Sun's surface temperature, and it shines at 245× the Sun's brightness. At magnitude 5.0 it is bright enough to see with the naked eye; the light you see left it 560 years ago.

560 lybrightness mag 5.05B5V

Also catalogued as HR 989 · HD 20418 · HIP 15444

11,046 K

temperature

5.05

apparent magnitude

245× ☉

luminosity vs Sun

B5V

spectral type

Distance & comparison with our Sun

560 years

at light speed from Earth

1.91×

as hot as the Sun

245×

the Sun's light output

-1.13

absolute magnitude

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31 PerB-type

Sky regionPerseusthis direction

Nearest stars

Bright stars in Perseus

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VISIBLE TO THE NAKED EYE

Brightness mag 5.0To see it no equipment neededLook toward Perseus

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.