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Menkib or Xi Persei is a blue supergiant. Most of its luminosity it radiates in ultraviolet. In visible light it shines only 13 500 times brighter than our Sun. With 37 000 Kelvin it is one of the hottest stars visible to the naked eye.
Menkib is accompanied in a 7 days orbit by a smaller star, about which nothing else is known.

Constellation: Perseus
Distance: 1773 light-years
Spectral class: O7.5
Visual magnitude: 4.04
Luminosity: 330 000 * Sun
Mass: 40 * Sun

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Photo: ESO Online Digitized Sky Survey

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