B-type star · blue-white star

HR 3638

HR 3638 is a blue-white star in the constellation Hydra 273 ly from Earth. Its surface is about 10,125 K, about 1.8 times the Sun's surface temperature, and it shines at 31.13× the Sun's brightness. At magnitude 5.7 it is bright enough to see with the naked eye; the light you see left it 273 years ago.

273 lybrightness mag 5.73A0/A1V

Also catalogued as HD 78702 · HIP 44923

10,125 K
temperature
5.73
apparent magnitude
31.13× ☉
luminosity vs Sun
A0/A1V
spectral type
Distance & comparison with our Sun
273 years
at light speed from Earth
1.75×
as hot as the Sun
31.13×
the Sun's light output
1.12
absolute magnitude
Explore from here · roam the neighborhood
HR 3638B-type
Sky regionHydrathis direction
StarHR 350730 ly
StarHR 347330 ly
StarHR 382234 ly
StarGamma Hyastar
StarZeta Hyastar
Nearest stars
Bright stars in Hydra
Can you see it tonight?
VISIBLE TO THE NAKED EYE
Brightness mag 5.7To see it no equipment neededLook toward Hydra

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.