Ko Io te marama tuarima i roto i Jupiter. Ka tangohia e ia e pā ana ki 42.5 haora ki te whakaoti i tetahi orbit a tawhio noa Jupiter (tere nui mo tona nekehanga ki te kia kitehia i runga i te po kotahi o te tirohanga). Kei roto i Io he 2: 1 te tikanga nekehanga resonance orbital ki Europa me te 4: 1 te tikanga nekehanga orbital resonance ki Ganymede, whakaoti e rua orbit o Jupiter mo ia kotahi orbit oti e Europa, me wha orbit mo ia kotahi oti e Ganymede. tauturu tenei resonance Io o te eccentricity orbital marama (0.0041), e whakarato ana ia i te mahi nui i roto i te huri i tona orbit tuatahi i roto i te arahi atu i te matawai o te ao.
42.5 haora