Io inotenderera Jupiter iri kure nemakiromita 421,700 kubva pakati peJupiter uye 350,000 kubva kumakomo emakore ayo. Ndiyo yemukati yemasetelliti eGalilean eJupiter, kutenderera kwayo kuri pakati peThebe neEuropa. Kusanganisira masetelliti emukati eJupiter, Io ndiyo mwedzi wechishanu kubva kuJupiter. Zvinotora maawa angangoita 42.5 kuti Io ipedze kutenderera imwechete kutenderera Jupiter (nekukurumidza zvakakwana kuti kufamba kwayo kuonekwe pamusoro pehusiku humwe hwekucherechedza). Io iri mu 2: 1 avhareji-kufamba kwekutenderera resonance neEuropa uye 4: 1 avhareji-kufamba kwekutenderera resonance neGanymede, ichipedzisa kutenderera maviri eJupiter kune imwe neimwe orbit yakapedzwa neEuropa, uye ina orbits kune imwe neimwe yakapedzwa neGanymede. Uku resonance kunobatsira Io's eccentric orbital mwedzi, iyo inopa basa rekutanga mukutendeuka kwepakati (0.0041), iyo inotungamira kudzoka kuburikidza neJupiter.
Maawa 42,5