B-type star · blue-white star
21 Peg
21 Peg is a blue-white star in the constellation Pegasus 630 ly from Earth. Its surface is about 10,795 K, about 1.9 times the Sun's surface temperature, and it shines at 151× the Sun's brightness. At magnitude 5.8 it is bright enough to see with the naked eye; the light you see left it 630 years ago.
Also catalogued as HR 8404 · HD 209459 · HIP 108875
10,795 K
temperature
5.83
apparent magnitude
151× ☉
luminosity vs Sun
B9.5V
spectral type
Distance & comparison with our Sun
630 years
at light speed from Earth
1.87×
as hot as the Sun
151×
the Sun's light output
-0.60
absolute magnitude
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VISIBLE TO THE NAKED EYE
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.