Io

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Io
Io is the innermost of the four Galilean moons of the planet Jupiter. It is the fourth-largest moon, has the highest density of all the moons, and is the driest known object in the Solar System. It was discovered in 1610 and was named after the mythological character Io, a priestess of Hera who became one of Zeus's lovers. With over 400 active volcanoes, Io is the most geologically active object in the Solar System. This extreme geologic activity is the result of tidal heating from friction generated within Io's interior as it is pulled between Jupiter and the other Galilean satellites—Europa, Ganymede and Callisto. Io (moon) - Wikipedia, the free encyclopedia
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Short Description Io is the innermost of the four Galilean moons of the planet Jupiter. It is the fourth-largest moon, has the highest density of all the moons, and is the driest known object in the Solar System. It was discovered in 1610 and was named after the mythological character Io, a priestess of Hera who became one of Zeus's lovers. With over 400 active volcanoes, Io is the most geologically active object in the Solar System. This extreme geologic activity is the result of tidal heating from friction generated within Io's interior as it is pulled between Jupiter and the other Galilean satellites—Europa, Ganymede and Callisto. Io (moon) - Wikipedia, the free encyclopedia
Discovered by Galileo Galilei
Discovery date 8 January 1610
Type Moon
AddInfo Jupiter I
Satellite of Jupiter
Orbit Prograde
Rotation Synchronous
Atmosphere Trace
Shape Equilibrium spheroid
Geological activity Is active
Apoapsis 06 423 400 km
Periapsis 06 420 000 km
Semi-major axis 06 4217 00 km
Distance from Sun 01 5.202 60 au /05
Eccentricity 0.004 1
Orbital period 1.769137786 days | 152 853.5047 sec | 42.459 306 86 hour)
Orbital speed 02 17.334 km/s
Inclination to the ecliptic 002.213°
Inclination to the equator 000.05°
Diameter/Size 04 3 643.2 ± 1 km | 0.286 Earths
Dimensions 3,660.0 × 3,637.4 × 3,630.6 km
Mass 1022×8.931 938 ± 0.000 018 kg | 0.015 Earths
Density 01 3.528 ± 0.006 g/cm3
Surface gravity 01 1.796 m/s2
Escape velocity  2 558 m/s
Rotation period 1.769137786 days
Equatorial rotation velocity 01  m/s
Axial tilt
Albedo geometric 0.63 ± 0.02
Temperature min 02 90 K
Temperature mean 03 110 K
Temperature max 03 130 K
Apparent magnitude 5.02 (opposition)
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