B-type star · blue-white star

HR 7815

HR 7815 is a blue-white star in the constellation Cygnus 2,118 ly from Earth. Its surface is about 10,448 K, about 1.8 times the Sun's surface temperature, and it shines at 931× the Sun's brightness. At magnitude 6.5 it is within reach of 50 mm binoculars; the light you see left it 2,118 years ago.

2,118 lybrightness mag 6.49B9.5III

Also catalogued as HD 194668 · HIP 100651

10,448 K
temperature
6.49
apparent magnitude
931× ☉
luminosity vs Sun
B9.5III
spectral type
Distance & comparison with our Sun
2,118 years
at light speed from Earth
1.81×
as hot as the Sun
931×
the Sun's light output
-2.57
absolute magnitude
Explore from here · roam the neighborhood
HR 7815B-type
Sky regionCygnusthis direction
StarHR 7791140 ly
StarHR 8164370 ly
Star55 Cyg390 ly
StarSadrstar
StarAljanahstar
Nearest stars
Bright stars in Cygnus
Can you see it tonight?
BINOCULARS NEEDED
Brightness mag 6.5To see it 50 mm binocularsLook toward Cygnus

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.