M-type star · red dwarf
Barnard's Star
Barnard's Star is a red dwarf in the constellation Ophiuchus 5.9 ly from Earth. Its surface is about 3,691 K, about 0.6 times the Sun's surface temperature, and it shines at 0.0004× the Sun's brightness. At magnitude 9.5 it is within reach of 4-6" (100-150 mm) telescope; the light you see left it 6 years ago.
Also catalogued as HIP 87937 · Gliese Gl 699
3,691 K
temperature
9.54
apparent magnitude
0.0004× ☉
luminosity vs Sun
sdM4
spectral type
Distance & comparison with our Sun
6 years
at light speed from Earth
0.64×
as hot as the Sun
0.0004×
the Sun's light output
13.23
absolute magnitude
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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.