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Regulus

The brightest star of Leo is at the place of its forepaw. It is a triple system of a relatively small blue star, an orange sunlike star and a red dwarf.

Constellation: Leo
Age: < 300 million years
Distance: 77.5 light-years
Radial velocity: 5.9 km/sec
Space between Regulus A and B/C: 4205 AU
Space between Regulus B and C: 92.70 AU

Regulus A

Spectral class: B7
Visual magnitude: 1.36
Luminosity: 141 * Sun
Mass: 4.4 * Sun
Diameter: 3.5 * Sun
  

Regulus B

Spectral class: K1
Visual magnitude: 8.0
Luminosity: 0.31 * Sun
Mass: 0.8 * Sun
  

Regulus C

Spectral class: M
Visual magnitude: 13
Luminosity: 0.0031 * Sun
Mass: 0.2 * Sun

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The constellation Leo, one of the few constellations that really looks like its name implies.
Graphic: Nasa
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