Io

! colspan="2" style="background: #a0c0ff; text-align:center;" | Orbital characteristics ! colspan="2" style="background: #c0a5a0; text-align:center;" | Physical characteristics ! colspan="2" style="background: #d0a00c; text-align:center;" | Other
 * + Io
 * Orbital period || 2.8601 Earth days 1 Ioan day
 * Semi-major axis || 1,264,883 km
 * Semi-major axis || 1,264,883 km
 * Semi-major axis || 1,264,883 km
 * Rotation period || 2.8601 Earth days (synchr.)
 * Mean diameter || 13,982 km
 * Axial tilt || 0.6°
 * Temperature Min. Main Max. || ? K 584 K ? K
 * Atmospheric pressure (at MSL) || 1593 mbar
 * Axial tilt || 0.6°
 * Temperature Min. Main Max. || ? K 584 K ? K
 * Atmospheric pressure (at MSL) || 1593 mbar
 * Atmospheric pressure (at MSL) || 1593 mbar
 * Atmospheric pressure (at MSL) || 1593 mbar
 * Inhabitants Density || 0 0
 * Countries || none recognized (according to UN)
 * }
 * Countries || none recognized (according to UN)
 * }

Io is the nearest major planet of Jupiter. It is the most volcanically active body in the solar system.