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On 1 January 2014, a 3-meter (10 foot) asteroid, 2014 AA was discovered by the Mount Lemmon Survey and observed over the next hour, and was soon found to be on a collision course with Earth. The exact location was uncertain, constrained to a line between Panama , the central Atlantic Ocean, The Gambia , and Ethiopia.
Gravitational accelerations at L 4. The Hill sphere is the region in which an astronomical body dominates the attraction of satellites. Of the Solar System planets, Neptune and Uranus have the largest Hill spheres, due to the lessened gravitational influence of the Sun at their far orbits, however all of the giant planets have Hill spheres in the vicinity of 100 million kilometres in radius.