| Introduction to the Io source data |
Io has now been visited by five spacecraft:
|
Mission |
Closest encounter date(s) |
Type of encounter |
Significant Io discoveries |
Closest approach (km) |
Best image resolution |
| Pioneer 10 |
3 December 1973 |
flyby |
|
no images |
no images |
| Pioneer 11 |
2 December 1974 |
flyby |
young surface |
756,000 |
357 km |
| Voyager 1 |
5 March 1979 |
flyby |
active volanism on Io |
21,000 |
1 km |
| Voyager 2 |
9 July 1979 |
flyby |
changes on surface since Voyager 1 encounter |
1,130,000 |
20 km |
| Galileo |
7 December 1995 to 31 December 1999 |
Jupiter orbiter |
iron core |
245,000 |
2.5 km |
The global geology map of Io is based on data from the Voyager 1 and Voyager 2 missions. See introductions in map texts for additional mapping source data information.
| To other data introductions: | Mercury | Venus | Moon | Mars | Jovian Satellites: | Io | Europa | Ganymede | Callisto |
| To index maps: | Mercury | Venus | Moon | Mars | Jovian satellites: | Io | Europa | Ganymede | Callisto |
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