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Gliese 105

A small triple system. The C star, a red dwarf, is with 2600 kelvin surface temperature the coolest known main sequence star. Its mass is just enough to start the hydrogen fusion.
The B star is a bigger red dwarf, A is a yellow-orange star.

Constellation: Cetus
Distance: 23.5 light-years
Space between Gliese 105 A and B: 1200 AU
Space between Gliese 105 A and C: 24 AU

Gliese 105 A

Spectral class: K3
Visual magnitude: 5.82
Luminosity: 0.21 * Sun
Mass: 0.81 * Sun
Diameter: 0.85 * Sun
  

Gliese 105 B

Spectral class: M3.5
Visual magnitude: 12
Luminosity: 0.001 * Sun
Mass: 0.21 * Sun
Diameter: 0.28 * Sun
  

Gliese 105 C

Spectral class: M7

Luminosity: 0.0000084 * Sun
Mass: 0.082 * Sun

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Gliese 105 A and C
Graphic: Nasa, Hubble Telescope
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