Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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A moon of 5262 km diameter at about 1,070,400 km from the planet Jupiter. The gravity at its surface is about 0.1457 times as strong as on Earth. The moon goes once around its planet in about 7.2 days. The moon was discovered in 1610. Also called JIII (Jupiter three).