Jupiter is the third brightest object in the night sky. Its orbital period is 11.9 Earth years. Its semi-major axis is 5.20 A. U. (778,000,000 km).

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Jupiter is the third brightest object in the
night sky.Its orbital period is 11.9 Earth
years.Its semi-major axis is 5.20 A. U.
(778,000,000 km).
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Jupiter is orbited by many moons. The four
largest are called the Galilean Moons.
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Mass 1.9 x 1030g (318 Earth masses)This is
more than twice the mass of all the other planets
combined.Our solar system is a two object system
with some debris.
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Radius 71,400 km, 11.2 Earth radii. It would
take 1400 Earths to equal Jupiters volume.
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Average Density 1.3 g/cm3 (Earths is 5.5).
This density is the result of Jupiter being
composed primarily of hydrogen and helium.
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The different latitude zones rotate at different
speeds. This is called differential rotation.
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The magnetosphere rotates at the same speed as
the areas near the poles 9 hr 56 min. This is
the fastest rotation rate of any known solar
system object.
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The equatorial regions rotate even faster 9 hr
and 50 min. This rapid spin rate causes Jupiter
to be 6.5 fatter at the equator than at the
poles. The term for this difference in diameter
is oblateness.
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Jupiter is believed to have a small, dense, rocky
core about the size of the Earth itself.
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Jupiter has an axial tilt of only 3, and its
orbit is very nearly circular. There is very
little seasonal change.
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ExplorationJupiter was visited by Pioneer
10(1973) and Pioneer 11(1974) and Voyager 1
2(1979). Galileo visited in 1995.
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