M-type star · red
51 Gem
51 Gem is a red in the constellation Gemini 541 ly from Earth. Its surface is about 3,577 K, about 0.6 times the Sun's surface temperature, and it shines at 224× the Sun's brightness. At magnitude 5.1 it is bright enough to see with the naked eye; the light you see left it 541 years ago.
Also catalogued as HR 2717 · HD 55383 · HIP 34909
3,577 K
temperature
5.07
apparent magnitude
224× ☉
luminosity vs Sun
K3V
spectral type
Distance & comparison with our Sun
541 years
at light speed from Earth
0.62×
as hot as the Sun
224×
the Sun's light output
-1.03
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.