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Metis (moon)
Metis (; (ギリシア語:Μήτις)), also known as , is the innermost moon of Jupiter. It was discovered in 1979 in images taken by ''Voyager 1'', and was named in 1983 after the first wife of Zeus, Metis. Additional observations made between early 1996 and September 2003 by the ''Galileo'' spacecraft allowed its surface to be imaged.
Metis is tidally locked to Jupiter, and its shape is strongly asymmetrical, with one of the diameters being almost twice as large as the smallest one. It is also one of the two moons known to orbit Jupiter in less than the length of Jupiter's day, the other being Adrastea. It orbits within the main ring of Jupiter, and is thought to be a major contributor of material to the rings.
== Discovery and observations ==
Metis was discovered in 1979 by Stephen P. Synnott in images taken by the ''Voyager 1'' probe and was provisionally designated as . In 1983 it was officially named after the mythological Metis, a Titaness who was the first wife of Zeus (the Greek equivalent of Jupiter). The photographs taken by ''Voyager 1'' showed Metis only as a dot, and hence knowledge about Metis was very limited until the arrival of the ''Galileo'' spacecraft. ''Galileo'' imaged almost all of the surface of Metis and put constraints on its composition by 1998.
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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