B-type star · blue-white star

40 Tau

40 Tau is a blue-white star in the constellation Taurus 641 ly from Earth. Its surface is about 11,247 K, about 1.9 times the Sun's surface temperature, and it shines at 250× the Sun's brightness. At magnitude 5.3 it is bright enough to see with the naked eye; the light you see left it 641 years ago.

641 lybrightness mag 5.32B3V

Also catalogued as HR 1253 · HD 25558 · HIP 18957

11,247 K
temperature
5.32
apparent magnitude
250× ☉
luminosity vs Sun
B3V
spectral type
Distance & comparison with our Sun
641 years
at light speed from Earth
1.95×
as hot as the Sun
250×
the Sun's light output
-1.15
absolute magnitude
Explore from here · roam the neighborhood
40 TauB-type
Sky regionTaurusthis direction
StarHR 139772 ly
StarHR 124385 ly
StarHR 134985 ly
StarElnathstar
StarAlcyonestar
Nearest stars
Bright stars in Taurus
Can you see it tonight?
VISIBLE TO THE NAKED EYE
Brightness mag 5.3To see it no equipment neededLook toward Taurus

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.