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The orbits around the sun of Cruithne and Earth over the course of a year (from September 2007 to August 2008).

Earth’s Other ‘Moon’ And Its Crazy Orbit Could Reveal Mysteries Of The Solar System | IFLScience

from io9

The Story Behind Earth's "Other" Moon And Its Completely Whacked Orbit

In 1997, we discovered that another body, 3753 Cruithne, is a quasi-orbital satellite of Earth.


.gif: 3753 Cruithne does not actually orbit the Earth. Its eccentric orbit is in 1:1 resonance with ours, taking a year to go once around the Sun. From our frame of reference, Cruithne appears to be moving in a bean-shaped orbit about the Earth. This animation shows a similar orbit.