"On November 8th, 2011 at 23:28 UT, the asteroid will safely pass within 0.85 lunar distances of the Earth.[3] A lunar distance of 0.85 is also 0.00217 AU (325,000 km; 202,000 mi).[3] On November 9th, 2011 at 07:13 UT, the asteroid will pass 0.00160 AU (239,000 km; 149,000 mi) from the moon.[3] During the close approach, the asteroid should reach about apparent magnitude 11,[3][8] and may be visible to expert observers using high-end binoculars with an objective lens of 80mm or larger. Since the gibbous moon will interfere with the viewing,[5] amateur observers trying to visually locate the asteroid will require a telescope with an aperture of 6 inches (15 centimeters) or larger.[5][6]
"Approximate trajectory: The next time a known asteroid this large will come this close to Earth will be in 2028[5] when (153814) 2001 WN5 passes 0.00166 AU (248,000 km; 154,000 mi) from the Earth.[9]"--Wikipedia entry for "YU55"
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