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Lyra (IPA: , ) is one of the 48 constellations listed by Ptolemy, and is one of the 88 modern constellations recognized by the International Astronomical Union. Lyra is a small constellation, but its principal star, Vega, is one of the brightest in the sky. Vega forms a vertex of the Summer Triangle asterism. Lyra took its name from the stringed musical instrument well known for its use in Classical Antiquity and still in some areas of Greece.