2005 YU55 is about 400 meters [1,300 feet] wide, and closest approach will be about 325,000 kilometers (201,700 miles) from Earth:
Trajectory for asteroid 2005 YU55 - November 8-9, 2011. Image credit: NASA/JPL-Caltech
"This is the largest space rock we have identified that will come this close until 2028,” said Don Yeomans, manager of NASA’s Near-Earth Object Program Office at JPL, and Yeomans assured that we are in no danger from this asteroid.
“YU55 poses no threat of an Earth collision over, at the very least, the next 100 years,”...
This radar image of asteroid 2005 YU55 was generated from data taken in April of 2010 by the Arecibo Radar Telescope in Puerto Rico. Image credit: NASA/Cornell/Arecibo
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Via Tech Today w/ Ken May