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Spica

The brightest star of Virgo consists of two very close blue stars.
From our point of view the star changes regularly its luminosity. This is because both stars cover each other (a so called eclipsing binary).

Constellation: Virgo
Distance: 262 light-years
Radial velocity: 1 km/sec
Space between Spica A and B: 0.122 AU
Orbit period of Spica A and B: 4.01416 days

Spica A

Spectral class: B1
Visual magnitude: 1.06
Luminosity: 13 400 * Sun
Mass: 10.9 * Sun
Diameter: 7.34 * Sun
  

Spica B

Spectral class: B7
Visual magnitude: 2.50
Luminosity: 1700 * Sun
Mass: 6.8 * Sun
Diameter: 4 * Sun

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Photo: Albert Manzanares
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