Io1 - Io(moon Io Galileo spacecraft image of Io The dark spot just left of center is the erupting volcano Prometheus Whitish plains on either side

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Io (moon) Io Galileo spacecraft image of Io. The dark spot just left of center is the erupting volcano Prometheus . Whitish plains on either side of it are coated with volcanically emplaced sulfur dioxide frost, while yellower regions are encrusted with a higher proportion of sulfur . Discovery Discovered by Galileo Galilei Discovery date January 8, 1610 [1] Designations Alternate name(s) 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 (152 853.504 7 s, 42.459 306 86 h) Average orbital speed 17.334 km/s Inclination 2.21° (to the ecliptic ) 0.05° (to Jupiter's equator)
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Satellite of Jupiter Proper orbital elements Physical characteristics Dimensions 3,660.0 × 3,637.4 × 3,630.6 km [2] Mean radius 1,821.3 km (0.286 Earths) [2] Surface area 41,910,000 km 2 (0.082 Earths) Volume 2.53×10 10 km 3 (0.023 Earths) Mass 8.9319×10 22 kg (0.015 Earths) Mean density 3.528 g/cm 3 Equatorial surface gravity 1.796 m/s 2 (0.183 g ) Escape velocity
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Io1 - Io(moon Io Galileo spacecraft image of Io The dark spot just left of center is the erupting volcano Prometheus Whitish plains on either side

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