(121514) 1999 UJ7 is a small asteroid which orbits near the L4 point of Mars (60 degrees ahead Mars on its orbit). As of September 2011 (121514) 1999 UJ7 is the only known asteroid to orbit the leading L4 point of Mars although at least three other asteroids orbit Mars’s trailing L5 point: 5261 Eureka (101429) 1998 VF31 and 2007 NS2.
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