F-type star · yellow-white star
Sigma Boo
Sigma Boo is a yellow-white star in the constellation Boötes 51.6 ly from Earth. Its surface is about 7,078 K, about 1.2 times the Sun's surface temperature, and it shines at 3.56× the Sun's brightness. At magnitude 4.5 it is bright enough to see with the naked eye; the light you see left it 52 years ago.
Also catalogued as HR 5447 · HD 128167 · HIP 71284 · Gliese Gl 557
7,078 K
temperature
4.47
apparent magnitude
3.56× ☉
luminosity vs Sun
F3Vwvar
spectral type
Distance & comparison with our Sun
52 years
at light speed from Earth
1.23×
as hot as the Sun
3.56×
the Sun's light output
3.47
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.