List of surface features on Mercury
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| Io | |
|---|---|
| |
| Io in Orbiter | |
| Designation | |
| Name | Io |
| Reference body | Jupiter |
| Number of satellites | 0 |
| Physical parameters* | |
| Mass | 8.933×1022 kg |
| Mean Radius | 1.821×106 m |
| Siderial day | 152900 s |
| Orbital period | 1.531×105 s (365.625 days) |
| Obliquity of ecliptic | 2.18° |
| Atmosphere | Yes |
| Atmosphere* | |
| Atmosphere model | Generic |
| Surface Pressure | 0 KPa |
| Surface Density | 0.0001 kg/m3 |
| Specific gas constant | 1.92 J/(K kg) |
| Specific heat ratio | 0.33 |
| Osculating elements (ecliptic frame)* | |
| Semi-major axis | 4.2204×108 m |
| Eccentricity | 0.00447 |
| Inclination | 2.18° |
| Longitude of ascending node | 337.18° |
| Longitude of periapsis | 76° |
| Note | *Elements given are from Orbiter 2016 |