The full size image of Io is 80 KB.
Last updated August 17, 1995
| MEAN RADIUS | 1830 km |
| MASS | 0.0149 (Earth=1) |
| DENSITY | 3.55 (gm/cm) |
| GRAVITY | 0.138 (Earth=1) |
| ORBIT PERIOD: | 1.769(Earth days) |
| ROTATION PERIOD | 1.769(Earth days) |
| SEMIMAJOR AXIS OF ORBIT | 422,500 km |
| ECCENTRICITY OF ORBIT | 0.004 |
Official names of features on Io as approved by the International Astronomical Union.
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