image: Frames from a movie showing a radar-derived computer model of near-Earth binary asteroid (66391) 1999 KW4. The larger component is about 1.5 kilometers in diameter and rotates once every 2.8 hours, and the components' orbital period is 17.4 hours. This image relates to an article that appeared in the October 13, 2006, issue of the journal Science, published by AAAS. The study, by Dr. Steven Ostro of Jet Propulsion Laboratory in Pasadena and colleagues, was titled "Radar Imaging of Near-Earth Binary Asteroid (66391) 1999 KW4." view more
Credit: Image provided by NASA/JPL image courtesy Dan Scheeres (U. of Michigan) and Steve Ostro (JPL), via <i>Science</i>-AAAS.