B-type star · blue-white star
Nunki
Nunki is a blue-white star in the constellation Sagittarius 228 ly from Earth. Its surface is about 12,178 K, about 2.1 times the Sun's surface temperature, and it shines at 643× the Sun's brightness. At magnitude 2.0 it is bright enough to see with the naked eye; the light you see left it 228 years ago.
Also catalogued as Sigma Sgr · HR 7121 · HD 175191 · HIP 92855
12,178 K
temperature
2.05
apparent magnitude
643× ☉
luminosity vs Sun
B2.5V
spectral type
Distance & comparison with our Sun
228 years
at light speed from Earth
2.11×
as hot as the Sun
643×
the Sun's light output
-2.17
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.