| Discovered By | Galileo Galilei |
| Date of Discovery | 1610 |
| Average Distance from Jupiter | 671,000 km (metric) |
| Equatorial Radius | 1,565 km (metric) |
| Mass | 47,998,200,000,000,000,000,000 kg (metric) |
| Orbit Period (Length of Year) | 3.551181041 Earth days |
| Orbital Eccentricity | 0.009 |
| Orbital Inclination to Ecliptic | 0.47° |
| Atmospheric Constituents | Oxygen |
