Callisto

One of the four brightest satellites of Jupiter and the sixth in distance from the planet. Originally sighted by Galileo, it is the largest planetary satellite. Callisto was a nymph, beloved of Zeus and hated by Hera. Hera changed her into a bear, and Zeus then placed her in the sky as the constellation Ursa Major. Callisto is an independent state in the Cooperative Federation of the Jovian Realm.