Dione was discovered by Giovanni Domenico Cassini in 1684 using a
large aerial telescope on the grounds of
the Paris Observatory.
Dione name is suggested by John Herschel on 1847. He suggested the names of the Titans, sisters and brothers of Cronos (the Greek Saturn), be used.
This Dione map is based on the Cassini and Voyager missions.
At 1122 km in diameter, Dione is the 15th largest moon in the Solar System, and is more massive than all known moons smaller than itself combined. It is composed primarily of water ice, but as the third densest of Saturn's moons (after Enceladus and Titan, whose density is increased by gravitational compression) it must have a considerable fraction (~ 46%) of denser material like silicate rock in its interior.
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Text based on Wikipedia,
License: CC-by-SA 3.0
License of the map: Public Domain