(53319) 1999 JM8 (also written (53319) 1999 JM8) is a near-Earth asteroid and Mars-crosser asteroid discovered by LINEAR. Radar imaging by Goldstone and Arecibo has revealed the asteroid to be 7 km in diameter. Like the asteroid 4179 Toutatis its rotation speed is unusually slow and possibly chaotic.It passed closer than 0.20 AU to the Earth five times in the last century (0.033 AU in 1990) but its closest approach in the 21st century will be in 2075 at 0.256 AU.
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