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3753 Cruithne, a planetoid whose orbit around the Sun is approximately 364 days.
Cruithne is approximately 5 kilometres (3.1 mi) in diameter, and its closest approach to Earth is approximately thirty times the separation between Earth and the Moon (12 Gm or twelve million kilometres). From 1994 through 2015, Cruithne makes its annual closest approach to Earth every November. Although Cruithne’s orbit is not thought to be stable over the long term, calculations by Wiegert and Innanen showed that it has probably been synchronized with Earth’s orbit for a long time.
The Committee to Nuke Elysium 