B-type star · blue-white star
Rukbat
Rukbat is a blue-white star in the constellation Sagittarius 182 ly from Earth. Its surface is about 11,658 K, about 2.0 times the Sun's surface temperature, and it shines at 70.53× the Sun's brightness. At magnitude 4.0 it is bright enough to see with the naked eye; the light you see left it 182 years ago.
Also catalogued as Alpha Sgr · HR 7348 · HD 181869 · HIP 95347
11,658 K
temperature
3.96
apparent magnitude
70.53× ☉
luminosity vs Sun
B8V
spectral type
Distance & comparison with our Sun
182 years
at light speed from Earth
2.02×
as hot as the Sun
70.53×
the Sun's light output
0.23
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.