Constellations
From Keyser and de Houtman's observations, Plancius created twelve new constellations of the southern sky that have become accepted as modern constellations. The majority were named after various beings that 16th century explorers had encountered (e.g. Bird of Paradise, Chameleon, Toucan, Flying Fish). They were published on Plancius' celestial globe of late 1597, which was published by Jodocus Hondius. Willem Janszoon Blaeu copied these constellations on a 1602 globe and created a new globe in 1603 based on de Houtman's observations during a second voyage to the East Indies. Johann Bayer copied the southern constellations from a Plancius/Hondius globe in his 1603 Uranometria star atlas, crediting charting to a "Petrus Theodori", but not acknowledging their earlier publication, and is therefore often mistakenly credited for introducing them.
Keyser is commemorated by minor planet (10655) Pietkeyser.
Read more about this topic: Pieter Dirkszoon Keyser