B-type star · blue-white star

40 Per

40 Per is a blue-white star in the constellation Perseus 1,056 ly from Earth. Its surface is about 10,766 K, about 1.9 times the Sun's surface temperature, and it shines at 938× the Sun's brightness. At magnitude 5.0 it is bright enough to see with the naked eye; the light you see left it 1,056 years ago.

1,056 lybrightness mag 4.97B0.5V

Also catalogued as HR 1123 · HD 22951 · HIP 17313

10,766 K
temperature
4.97
apparent magnitude
938× ☉
luminosity vs Sun
B0.5V
spectral type
Distance & comparison with our Sun
1,056 years
at light speed from Earth
1.87×
as hot as the Sun
938×
the Sun's light output
-2.58
absolute magnitude
Explore from here · roam the neighborhood
40 PerB-type
Sky regionPerseusthis direction
StarAtik73 ly
StarHR 1286130 ly
StarHR 991150 ly
StarMirfakstar
StarZeta Perstar
Nearest stars
Bright stars in Perseus
Can you see it tonight?
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.