Chi Cygni (χ Cyg / χ Cygni) is a variable star of the Mira type in the constellation Cygnus. Most stars are of nearly constant luminosity. ... Mira variables are a class of pulsating variable stars characterized by very red colors, pulsation periods longer than 100 days, and light amplitudes greater than one magnitude. ... For the software company, see Cygnus Solutions. ...
Chi Cygni shows one of the largest variations in magnitude known. At the maximum Chi Cygni is +3.62 magnitude while at the minimum it is +15.00 magnitude. Thus Chi Cygni is visible at its minimum only with telescopes larger than 30 centimeters! Its distance is approximately 345 light years. The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... 50 cm refracting telescope at Nice Observatory. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...
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