Jupiter's Temporary Moons

Posted by John Farrier in Science & Tech on September 16, 2009 at 6:29 pm

Sarah Zielinski writes in The Smithsonian that Jupiter, as the largest planet in our solar system, occasionally pulls comets into its orbit. Sometimes, as with comet Shoemaker-Levy 9 in 1994 (pictured), Jupiter’s gravity will even pull a comet into a direct impact. Zielinsky writes:

Astronomers from Japan and Northern Ireland, presenting their findings today at the European Planetary Science Congress, used observations of Comet Kushida-Muramatsu—from when it was discovered in 1993 and when it returned in 2001—to calculate the comet’s path over the previous century. They determined that the comet became a temporary moon when it entered Jupiter’s neighborhood in 1949. It made two full, if irregular, orbits around the planet, and then continued its travels into the inner solar system in 1962.

The researchers also predict that Comet 111P/Helin-Roman-Crockett, which circled Jupiter between 1967 and 1985, will again become a temporary moon and complete six loops around the planet between 2068 and 2086.

“The results of our study suggests that impacts on Jupiter and temporary satellite capture events may happen more frequently than we previously expected,” David Asher of Northern Ireland’s Armagh Observatory told the AFP.

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Photo: NASA

 
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Smiley Sky Over Australia

Posted by Alex in Travel & Places on December 1, 2008 at 12:38 am

If you live in Australia, then you’ve probably already know this: tonight, a cosmic alignment of the planets and the moon will result in a smiley sky!

From soon after 8pm until just before 11pm the planets Venus and Jupiter will stare down from the western sky like two brilliant eyes. Directly below, the crescent moon will form a happy mouth.

"I think it will be very spectacular," Sydney Observatory’s astronomer, Nick Lomb, said. "The three brightest objects in the night sky will all be in the same patch of the sky."

As the night draws on, Dr Lomb predicted, "the smiley face" – with Venus playing the left eye and giant Jupiter the right – "will improve and become a little more compact".

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