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Mu Columbae

The big blue star once was the partner of AE Aurigae. The stars came into existance together in the Orion Nebula and since then drift away with high speed. Reason for this could have been a supernova explosion a long time ago.

Constellation: Columba
Age: 2.7 million years
Distance: 1300 light-years
Spectral class: O9.5
Visual magnitude: 5.17
Luminosity: 23 300 * Sun
Mass: 15 * Sun
Diameter: 4.5 * Sun
Radial velocity: 109 km/sec

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Photo: ESO Online Digitized Sky Survey
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