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Capella

Capella is a double double system. The first is a pair of near and similar yellow giants, which expand to red giants.
Far away (~1/6 light-year), nevertheless bound to the gravitation of the two big stars, is a pair of red dwarfs.

Constellation: Auriga
Distance: 42.2 light-years
Radial velocity: 22.2 km/sec
Space between Capella Aa and Ab: 0.71 AU
Space between Capella Ha and Hb: 48.1 AU
Space between Capella Aa/Ab and Ha/Hb: 11 000 AU

Capella Aa

Spectral class: G5
Visual magnitude: 0.71
Luminosity: 75.8 * Sun
Mass: 3 * Sun
Diameter: 10.8 * Sun
  

Capella Ab

Spectral class: G0
Visual magnitude: 0.96
Luminosity: 60.2 * Sun
Mass: 2.8 * Sun
Diameter: 7.45 * Sun
  

Capella Ha

Spectral class: M2
Visual magnitude: 10.20
Luminosity: 0.012 * Sun
Mass: 0.3 * Sun
Diameter: 0.56 * Sun
  

Capella Hb

Spectral class: M4
Visual magnitude: 13.70
Luminosity: 0.00048 * Sun
Mass: 0.1 * Sun
Diameter: 0.25 * Sun

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Capella Aa and Ab
Graphic: Nasa
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