(121514) 1999 UJ7とは 意味・読み方・使い方

(121514) 1997 UJ₇ is a small asteroid which orbits near the L4 point of Mars (60 degrees ahead Mars on its orbit). As of 2005 (121514) 1997 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 2001 DH₄₇. Not only does (121514) 1997 UJ₇ orbit on the other side of Mars from other similar asteroids, its spectrum is different as well, which is puzzling because all of the Martian trojans seem to be in very stable orbits.