From NASA- National Aeronautics and Space Administration:
Asteroid that flew past Earth today has moon! Asteroid 2004 BL86 passed Earth today at 16:19 UTC (11:19 a.m. EST). This "movie" of the asteroid was generated from our radar data. Twenty individual images were used. Radar observations allow scientists to better measure an asteroid's size, rotation and location. As a bonus, radar observations of 2004 BL86 detected a tiny moon orbiting the asteroid. Details:http://go.nasa.gov/15DrC4K
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