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Chi Cygni

The red giant is a Mira kind of variable star with a pulsation period of 407 days. It shows the most distinct change of luminosity of all stars known to us (except explosions).

Constellation: Cygnus
Distance: 345 light-years
Spectral class: S6
Visual magnitude: 3.3 - 14.3
Luminosity: 0.4 - 10 000 * Sun
Diameter: max. 300 * Sun

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Chi ( χ ) Cygni in Bode's 'Vorstellung der Gestirne' of 1782.
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