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drwayne
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Found here:<br /><br />http://www.physorg.com/news6236.html<br /><br />The rogue rock, 2004 MN4, measures 320 metres (1,000 feet) across, making it big enough to wipe out a large city if it ever collided with Earth. <br /><br />Last December, there were a few nail-biting days when NASA calculated, from early optical observations, that the asteroid had a more than one-in-50 chance of hitting Earth on April 13, 2029. <br /><br />In addition, astronomers could not rule out a risk that the rock could in fact hit Earth, its trajectory tweaked by terrestial gravity, when it made another swing around the Sun, this time in 2036. <br /><br />But measurements using Doppler radar at the giant Arecibo telescope in Puerto Rico have progressively fine-tuned the risk, which appears to be receding, said Jon Giorgina of NASA's Jet Propulsion Laboratory (JPL). <br /><br />These calculations show that the previous estimate of the flyby, of a distance of 36,000 kilometers (22,500 miles) from Earth's surface, may be out by some 4,000 kms (2,500 miles), Giorgina told AFP. <br /><br />In 2029, the asteroid will in fact swing by at around 32,000 kilometers (20,000 miles), making it an even narrower shave. <br /><br />More at the link..<br /> <div class="Discussion_UserSignature"> <p>"1) Give no quarter; 2) Take no prisoners; 3) Sink everything." Admiral Jackie Fisher</p> </div>