The Bayer designation is convention to name stars introduced by Johann Bayer in his work, Uranometria, published in 1609. It consists in a Greek letter, followed by the genitive form of the name of the constellations (exemples: Alpha Aurigae, Beta Orionis, etc.). The system is often abbreviated by writing the corresponding Greek letter in lower cap with the three letters abbreviation of the constellation (exemples: α UMi, η Car)