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  • Jupiter's Moon: Io Rotation - HD

    7,783 views 4 years ago
    Io is the innermost of the four Galilean moons of Jupiter and, with a diameter of 3,642 kilometers, the fourth-largest moon in the Solar System. It was named after Io, a priestess of Hera who became one of the lovers of Zeus. Nevertheless, it was simply referred to as Jupiter I, or The first satellite of Jupiter, until mid-20th century.

    With over 400 active volcanoes, Io is the most geologically active object in the Solar System. Its surface is dotted with more than 100 mountains, some which are taller than Earth's Mount Everest. Unlike most satellites in the outer Solar System (which have a thick coating of ice), Io is primarily composed of silicate rock surrounding a molten iron or iron sulfide core.
    Although not proven, recent data from the Galileo orbiter indicates that Io might have its own magnetic field Io has an extremely thin atmosphere made up mostly of sulfur dioxide (SO2). If a surface data or collection vessel were to land on Io in the future, it would have to be extremely tough (similar to the tank-like bodies of the Soviet Venera landers) to survive the radiation and magnetic fields that originate from

    Discovered by Galileo Galilei
    Discovery date January 7, 1610
    Designations
    Alternate name Jupiter I
    Adjective Ionian
    Orbital characteristics
    Periapsis 420,000 km (0.002 807 AU)
    Apoapsis 423,400 km (0.002 830 AU)
    Mean orbit radius 421,700 km (0.002 819 AU)
    Eccentricity 0.0041
    Orbital period 1.769 137 786 d (42 h)
    Average orbital speed 17.334 km/s
    Inclination 2.21° (to the ecliptic)
    0.05° (to Jupiter's equator)
    Satellite of Jupiter
    Physical characteristics
    Dimensions 3,660.0 × 3,637.4 × 3,630.6 km
    Mean radius 1,821.3 km (0.286 Earths)[1]
    Surface area 41,910,000 km2 (0.082 Earths)
    Volume 2.53 × 1010 km3 (0.023 Earths)
    Mass 8.9319 × 1022 kg (0.015 Earths)
    Mean density 3.528 g/cm3
    Equatorial surface gravity 1.796 m/s2 (0.183 g)
    Escape velocity 2.558 km/s
    Rotation period synchronous
    Equatorial rotation velocity 271 km/h
    Albedo 0.63 ± 0.02
    Surface temp.
    Surface min mean max
    130 K 200 K

    Apparent magnitude 5.02 (opposition)
    Atmosphere
    Surface pressure trace
    Composition 90% sulfur dioxide Show less
    Read more
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