Universe & space

Discovery of Lysithea

6 July 1938

Lysithea is a small moon of Jupiter, discovered on 6 July 1938 by the American astronomer Seth B. Nicholson at Mount Wilson Observatory in California. It orbits far from the planet and is a member of the Himalia group, a family of irregular moons with similar orbits that probably came from the break-up of a larger captured body. Lysithea is only about 36 kilometers across. For decades it was known only by a number and a provisional name, and it received its present name in 1975. It is named after Lysithea, a figure in Greek mythology described as a lover of Zeus, the counterpart of the Roman Jupiter.

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