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Io
Io highest resolution true color
Adjective(s) Unknown
Orbital properties
Aphelion/apoapsis 423400 km (0.002830 AU)
Perihelion/periapsis 420000 km (0.002807 AU)
Semi-major axis 421700 km (0.002819 AU)
Orbital eccentricity 0.0041
Orbital period 1.769137786 d (152853.5047 s, 42.45930686 h)
Average orbital speed 17.334 km/s
Physical properties
Radius 1821.6±0.5 km (0.286 Earths)
Mass (8.931938±0.000018)×1022 kg (0.015 Earths)
Mean density 3.528±0.006 g/cm3
Escape velocity 2.558 km/s
Rotation period synchronous
Average surface temperature min mean max

90 K 110 K 130 K

Apparent magnitude 5.02 (opposition)
Moons 0

Io is one of the Galilean Moons of Jupiter. It is the fourth largest moon in the Solar System, at 2,263 miles across; slightly larger than Earth's moon, and the second smallest Galilean Moon.

HistoryEdit

Jovian Moons
Metis - Adrastea - Amalthea - Thebe - Io - Europa - Ganymede - Callisto - Themisto - Leda - Himalia - Lysithea - Elara - Dia - Carpo - S/2003 J 12 - Euporie S/2003 J 3 - S/2003 J 18 - S/2011 J 1 - S/2010 J 2 - Thelxinoe - Euanthe - Helike - Orthosie Iocaste - S/2003 J 16 - Praxidike - Harpalyke - Mneme - Hermippe - Thyone - Ananke - Herse - Aitne - Kale - Taygete - S/2003 J 19 - Chaldene - S/2003 J 15 - S/2003 J 10 - S/2003 J 23 - Erinome - Aoede - Kallichore - Kalyke - Carme - Callirrhoe - Eurydome - S/2011 J 2 - Pasithee S/2010 J 1 - Kore - Cyllene - Eukelade - S/2003 J 4 - Pasiphaë - Hegemone - Arche - Isonoe - S/2003 J 9 - S/2005 J 5 - Sinope - Sponde - Autonoe Megaclite - S/2003 J 2

Io was discovered by Galileo in 1610. The Pioneer spacecrafts took the first close up pictures of Io. It was named after one of Zeus's many lovers.

TriviaEdit

  • Io is the most volcanic place in the solar system.
  • Io has over 400 active volcanoes.
  • Jupiters innermost moon is Io.
  • It is so volcanic because the friction from the gravitational pull of Jupiter on one side and the Galilean Satellites on the other.
  • Io is made of sulfur dioxide. 
  • Io recieves a lethal dose of radiation from Jupiter daily.
  • Io's highest peak is much higher than Earth's Mount Everest.
  • Io is made of rock, unlike most moons in the outer solar system, which are usually made of ice.
  • It was used to determine the speed of light, by measuring Io's eclipses across Jupiter.
  • It orbits Jupiter every 42 hours.
  • It is sometimes nicknamed 'The Pizza Moon' because of it's colour.
  • It, along with Europa, Ganymede and Callisto , were one of the first objects discovered by a telescope.

GalleryEdit

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