Cygnus
A conspicious constellation of the northern hemisphere. It belongs to the Hercules constellation family. The stars forming the swans body resemble a cross, so sometimes this constellation is refered as Northern Cross. The brightest star (spectraltype A2Iae; 1.25 mag), alpha Cyg, called Deneb (arab.: the tail), is among the 20 brightest stars in the sky.
The northern border of this constellation reaches as high as DECL=+60 degrees; to the south it extends down to about DECL=+28 degrees. From east to west it lies between RA=22h to RA=19h 10m (average).
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