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Alpha Orionis, the right shoulder of Orion (from our point of view at the left), glows in an impressive red. The red supergiant pulsates slightly irregular with a period of 2070 days. It is the supernova-candidate lying next to us.

Constellation: Orion
Distance: 427 light-years
Spectral class: M2
Visual magnitude: 0.45
Luminosity: 55 000 * Sun
Mass: 20 * Sun
Diameter: 662 * Sun
Radial velocity: 21 km/sec

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Photo: Nasa, Hubble Telescope
The first image of a star (except the Sun) showing its diameter.

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