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Encyclopedia > Jupiter > Satellites> Io II
CHARACTERISTICS OF IO (J-1)
| Characteristics | Values |
|---|---|
| Semi-major axis in km | 422 000 |
| Revolution period | 1.769 days |
| Rotation period | 1.769 days |
| Orbital velocity | 17 km/s |
| Inclination on the equator of Jupiter | 0.03° |
| Eccentricity of the orbit | 0.004 |
| Equatorial diameter (Earth=1) | 0.28 |
| Equatorial diameter | 3630 km |
| Visual magnitude of the opposition | 5,02 |
| Flattening | 0 |
| Mass (Jupiter=1) | 4.7/100 000 |
| Density (Water=1) | 3.53 |
| Surface gravity (Earth=1) | 0.38 |
| Escape velocity | 2600 m/s |
| Reflectivity (geometric albedo) | 0.61 |
| The hightest peak | 7000m |
| Deepest pit | 3000m |
| Atmosphere | none |
| Surface temperature | -143°C |
| Nature of the surface | Presence of hot volcanoes |
| Composition | sulfur silicates |
Opposite at the top, the Loki volcano's plume rises to 700 km altitude. Downstairs, the caldera of the volcano view. The images are from the Voyager spacecraft.