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Tucana
Tucana is a constellation of stars in the southern sky, named after the toucan, a South American bird. It is one of twelve constellations conceived in the late sixteenth century by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman. Tucana first appeared on a 35-cm (14 in) diameter celestial globe published in 1598 in Amsterdam by Plancius and Jodocus Hondius and was depicted in Johann Bayer's star atlas ''Uranometria'' of 1603. French explorer and astronomer Nicolas Louis de Lacaille gave its stars Bayer designations in 1756. The constellations Tucana, Grus, Phoenix and Pavo are collectively known as the "Southern Birds".
Tucana is not a prominent constellation as all of its stars are third magnitude or fainter; the brightest is Alpha Tucanae with an apparent visual magnitude of 2.87. Beta Tucanae is a star system with six member stars, while Kappa is a quadruple system. Five star systems have been found to have exoplanets to date. The constellation contains 47 Tucanae, one of the brightest globular clusters in the sky, and most of the Small Magellanic Cloud.
==History==
Tucana is one of the twelve constellations established by the Dutch astronomer Petrus Plancius from the observations of the southern sky by the Dutch explorers Pieter Dirkszoon Keyser and Frederick de Houtman, who had sailed on the first Dutch trading expedition, known as the ''Eerste Schipvaart'', to the East Indies. It first appeared on a 35-cm (14 in) diameter celestial globe published in 1598 in Amsterdam by Plancius with Jodocus Hondius. The first depiction of this constellation in a celestial atlas was in the German cartographer Johann Bayer's ''Uranometria'' of 1603. Both Plancius and Bayer depict it as a toucan.〔 De Houtman included it in his southern star catalogue the same year under the Dutch name ''Den Indiaenschen Exster, op Indies Lang ghenaemt'' "the Indian magpie, named Lang in the Indies", by this meaning a particular bird with a long beak—a hornbill, a bird native to the East Indies. A 1603 celestial globe by Willem Blaeu depicts it with a casque. It was interpreted on Chinese charts as ''Neaou Chuy'' "beak bird", and in England as "Brasilian Pye", while Johannes Kepler and Giovanni Battista Riccioli termed it ''Anser Americanus'' "American Goose", and Caesius as ''Pica Indica''. Tucana and the nearby constellations Phoenix, Grus and Pavo are collectively called the "Southern Birds".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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