| b>85 Io |
| bgcolor="#ffc0c0" colspan="2" | Orbital characteristics 1 |
| a href="/encyclopedia/Orbit" title="Orbit">Orbit type | Main belt (Eunomia) |
| a href="/encyclopedia/Semimajor-axis" title="Semimajor axis">Semimajor axis | 2.653 AU |
| a href="/encyclopedia/Perihelion" title="Perihelion">Perihelion distance | 2.141 AU |
| a href="/encyclopedia/Aphelion" title="Aphelion">Aphelion distance | 3.165 AU |
| a href="/encyclopedia/Orbital-period" title="Orbital period">Orbital period | 4.32 years |
| a href="/encyclopedia/Inclination" title="Inclination">Inclination | 11.97° |
| a href="/encyclopedia/Eccentricity" title="Eccentricity">Eccentricity | 0.193 |
| bgcolor="#ffc0c0" colspan="2" | Physical characteristics 1 |
| a href="/encyclopedia/Diameter" title="Diameter">Diameter | 154.8 km |
| a href="/encyclopedia/Rotation-period" title="Rotation period">Rotation period 3 | 6.875 hours |
| a href="/encyclopedia/Spectral-class" title="Spectral class">Spectral class | C |
| a href="/encyclopedia/Absolute-magnitude" title="Absolute magnitude">Abs. magnitude | 7.61 |
| a href="/encyclopedia/Albedo" title="Albedo">Albedo 4 | 0.067 |
| bgcolor="#ffc0c0" colspan="2" | History 2 |
| iscoverer | C. H. F. Peters, 1865 |