K-type star · orange
21 Sgr
21 Sgr is an orange in the constellation Sagittarius 410 ly from Earth. Its surface is about 4,104 K, about 0.7 times the Sun's surface temperature, and it shines at 164× the Sun's brightness. At magnitude 4.8 it is bright enough to see with the naked eye; the light you see left it 410 years ago.
Also catalogued as HR 6896 · HD 169420 · HIP 90289
4,104 K
temperature
4.81
apparent magnitude
164× ☉
luminosity vs Sun
A1/A2V
spectral type
Distance & comparison with our Sun
410 years
at light speed from Earth
0.71×
as hot as the Sun
164×
the Sun's light output
-0.69
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.