On 3/20/2009, asteroid 2009 DO111 flew past Earth only about 288,000 miles away--just beyond the orbit of the Moon! About the size of a football field, this dangerous space rock was visible in backyard telescopes as it sped through the constellation Cassiopeia shining at 13th magnitude, far below naked eye visibility.
Here is a nice photo taken
http://spaceweather.com/submissions/large_image_popup.php?image_name=David-Strange-2009DO111_20090318_dgs6_1237551645.jpg
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