K-type star · orange dwarf
21 Eri
21 Eri is an orange dwarf in the constellation Eridanus 110 ly from Earth. Its surface is about 4,941 K, about 0.9 times the Sun's surface temperature, and it shines at 4.05× the Sun's brightness. At magnitude 6.0 it is bright enough to see with the naked eye; the light you see left it 110 years ago.
Also catalogued as HR 1111 · HD 22713 · HIP 17027
4,941 K
temperature
5.97
apparent magnitude
4.05× ☉
luminosity vs Sun
K1V
spectral type
Distance & comparison with our Sun
110 years
at light speed from Earth
0.86×
as hot as the Sun
4.05×
the Sun's light output
3.33
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.