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Alnilam

Alnilam or Epsilon Orionis is a blue star. The central belt star of Orion is the most distant, but brightest of the three. It is at the end of its existance as a main sequence star and will soon evolve to a red supergiant. Then it will outshine Betelgeuse.

Constellation: Orion
Age: 4 million years
Distance: ca. 1340 light-years
Spectral class: B0
Visual magnitude: 1.69
Luminosity: 250 000 * Sun
Mass: 40 * Sun

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    Alnilam
To the left is Alnilam. Right below it and next to the Horsehead Nebula is Alnitak. In the upper right ist the Orion Nebula.
Photo: Robert Gendler

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