Pavo, constellation in the southern sky at about 20 hours right ascension and 65° south in declination. Its brightest star is Alpha Pavonis, sometimes known as Peacock, with a magnitude of 1.9. This constellation was invented by Pieter Dircksz Keyser, a navigator who joined the first Dutch expedition to the East Indies in 1595 and who added 12 new constellations in the southern skies. Pavo represents a peacock; Keyser may have encountered the green, or Javanese, peacock on his voyage.