B-type star · blue-white star
Theta CrB
Theta CrB is a blue-white star in the constellation Corona Borealis 375 ly from Earth. Its surface is about 12,048 K, about 2.1 times the Sun's surface temperature, and it shines at 255× the Sun's brightness. At magnitude 4.1 it is bright enough to see with the naked eye; the light you see left it 375 years ago.
Also catalogued as HR 5778 · HD 138749 · HIP 76127
12,048 K
temperature
4.14
apparent magnitude
255× ☉
luminosity vs Sun
B6Vnn
spectral type
Distance & comparison with our Sun
375 years
at light speed from Earth
2.09×
as hot as the Sun
255×
the Sun's light output
-1.17
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.