An amateur astronomer may have found another moon of the Earth. Experts say it may have only just arrived.

Much uncertainty surrounds the mysterious object, designated J002E2. It could be a passing chunk of rock captured by the Earth's gravity, or it could be a discarded rocket casing coming back to our region of space.



more info here http://news.bbc.co.uk/2/hi/science/nature/2251386.stm

Earth's new 'moon' is space junk


So, it looks like Earth does not have a new "moon" after all
The latest analysis of the mysterious object called J002E3 suggests it could well be a leftover Saturn V rocket component from one of the Apollo lunar missions.

The earth already has 2 moons, the 2nd one was found in 1986. But it turns out the one they found yesterday was indeed just space junk.

The text below is ripped from a bbc news article.

Earth's second one is called Cruithne. It was discovered in 1986 and it takes a convoluted horseshoe path around our planet as it is tossed about by the Earth's and the Moon's gravity.