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Saiph

Kappa Orionis, the right knee of Orion (from our point of view left), is a blue star with a surface temperature of 26 000 kelvin.
Although nearer to us and much more luminous as Rigel, it seems to be less bright. This is due to its high temperature, causing it to shine much stronger in ultraviolet, which is invisible to us.

Constellation: Orion
Distance: 720 light-years
Spectral class: B0.5
Visual magnitude: 2.06
Luminosity: 57 500 * Sun
Mass: 15 - 17 * Sun
Diameter: 11 * Sun

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    Saiph
Photo: Gruppo Astrofili Frisini

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