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Moon closest to Jupiter on March 9
Mon Mar 17, 2014 05:31

Moon closest to Jupiter on March 9

Look for the moon as soon as darkness falls on Sunday, March 9, 2014. The planet Jupiter is the very bright point of light nearby. On Sunday night, the moon and Jupiter are separated by about 7 degrees on the skyís dome, as seen from North America (a closed fist at armís length covers 10 degrees of sky). The moon and planet will stay out well past midnight. Theyíll set in the west in the wee hours before dawn. If you miss them on Sunday, look again. Jupiter and the moon are closest tonight, but Jupiter will remain fairly close to the moon for a few more nights.

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The giant planet Jupiter has more than twice the mass of all the other solar system planets, dwarf planets, asteroids and moons combined. Jupiterís mass is 318 times that of the Earth. Little wonder why Jupiter enjoys the King Planet designation!

Three of Jupiterís four largest moons are larger and more massive than Earthís moon. In their outward order from Jupiter, they are Io, Europa, Ganymede and Callisto. Only Europa is a touch smaller and less massive than our own moon.

In fact, you can view these moons as pinpoints of light with a modest backyard telescope or even good binoculars. See the present position of Jupiterís moons on this handy chart, courtesy of

Jupiterís four major moons from left to right: Io, Europa, Ganymede and Callisto. Image credit: NASA

Weíve been asked why Jupiterís moons move so quickly around Jupiter, although all four of Jupiterís major moons lie farther away from Jupiter than our moonís distance from Earth. For instance, Io Ė Jupiterís closest moon Ė has a semi-major axis of 421,800 kilometers in contrast to the semi-major axis of our moon of 384,400 kilometers. Despite Ioís greater distance from its parent planet, Io revolves around Jupiter in 1.769 days. Meanwhile, our moon takes a whopping 27.322 days to orbit Earth.

Itís Jupiterís great mass that causes Io and Jupiterís moons to move so quickly around Jupiter. If the Earth were as massive as Jupiter, then our moonís orbital period would be only 1.53 days. Or if Jupiter were as lightweight as Earth, then Ioís orbital period would be 31.55 days.

Bottom line: Use the waxing gibbous moon to find Jupiter, the king of the planets, on Sunday, March 9!

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