Jupiter (shown in a 2006 Hubble Space Telescope picture) captured a comet in 1949, and the "temporary moon" orbited the giant planet for 12 years before being cast aside, astronomers announced in September 2009.Image courtesy NASA via AP
From National Geographic:
Sixty years ago, Jupiter carried on a 12-year fling with an extra "moon" then casually cast it aside—and the gas giant will likely do it again within decades, scientists announced today.
In 1949 the massive planet's gravity pulled in comet 147P/Kushida-Muramatsu and held it in orbit until 1961, according to an international team led by Katsuhito Ohtsuka of the Tokyo Meteor Network.
Read more ....