Jupiter had temporary moon for 12 years

From AFP:

Data presented at the European Planetary Science Congress in Potsdam, near Berlin, showed that the biggest planet of the Solar System gained a temporary satellite, a comet called 147P/Kushida-Muramatsu, between 1949 and 1961.
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Kushida-Muramatsu, though, completed two full revolutions of Jupiter, following an irregular orbit, before it gained its freedom, according to calculations led Katsuhito Ohtsuka of the Tokyo Meteor Network.