B-type star · blue-white star

25 Cyg

25 Cyg is a blue-white star in the constellation Cygnus 1,320 ly from Earth. Its surface is about 12,159 K, about 2.1 times the Sun's surface temperature, and it shines at 1,244× the Sun's brightness. At magnitude 5.2 it is bright enough to see with the naked eye; the light you see left it 1,320 years ago.

1,320 lybrightness mag 5.15B3IV

Also catalogued as HR 7647 · HD 189687 · HIP 98425

12,159 K

temperature

5.15

apparent magnitude

1,244× ☉

luminosity vs Sun

B3IV

spectral type

Distance & comparison with our Sun

1,320 years

at light speed from Earth

2.11×

as hot as the Sun

1,244×

the Sun's light output

-2.89

absolute magnitude

Explore from here · roam the neighborhood

25 CygB-type

Sky regionCygnusthis direction

Nearest stars

Bright stars in Cygnus

Can you see it tonight?

VISIBLE TO THE NAKED EYE

Brightness mag 5.2To see it no equipment neededLook 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.