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Message: <blockquote data-quote="Shadow.Walker" data-source="post: 14397364" data-attributes="member: 456557"> <img src="http://www.jpl.nasa.gov/images/asteroid/20130201/asteroid20130201-full.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> The small near-Earth asteroid 2012 DA14 will pass very close to Earth on  February 15, so close that it will pass inside the ring of  geosynchronous weather and communications satellites. <img src="/styles/default/xenforo/smilies/default/shocked.gif"  class="smilie" loading="lazy" alt=":shocked:" title="Shocked    :shocked:" data-shortname=":shocked:" /><img src="/styles/default/xenforo/smilies/default/shocked.gif"  class="smilie" loading="lazy" alt=":shocked:" title="Shocked    :shocked:" data-shortname=":shocked:" /><img src="/styles/default/xenforo/smilies/default/shocked.gif"  class="smilie" loading="lazy" alt=":shocked:" title="Shocked    :shocked:" data-shortname=":shocked:" /> NASA's Near-Earth  Object Program Office can accurately predict the asteroid's path with  the observations obtained, and it is therefore known that there is no  chance that the asteroid might be on a collision course with Earth.  Nevertheless, the flyby will provide a unique opportunity for  researchers to study a near-Earth object up close. Asteroid 2012 DA14 will be closest to Earth on Feb. 15, at about 11:24  p.m. PST (2 p.m. EST and 1924 UT), when it will be at a distance of  about 27,700 kilometers (17,200 miles) above Earth's surface. Although  this is close enough for the asteroid to pass inside the ring of  geosynchronous satellites, located about 35,800 kilometers (22,200  miles) above the equator, it will still be well above the vast majority  of satellites, including the International Space Station.  At its  closest, the asteroid will be only about 1/13th of the distance to the  moon. The asteroid will fly by our planet quite rapidly, at a speed of  about 17,400 mph (7.8 kilometers per second) in a south-to-north  direction with respect to Earth. Even though 2012 DA14 is coming remarkably close, it will still only  appear as a point of light in the biggest of optical telescopes, because  of its small size. Based on its brightness, astronomers estimate that  it is only about 45 meters (150 feet) across. It will brighten only to  magnitude 7.5, too faint to be seen with the naked eye, but easily  visible with a good set of binoculars or a small telescope. The best  viewing location for the closest approach will be Indonesia, from which  the asteroid will be seen to move at a rate of almost 1 degree per  minute against the star background. Eastern Europe, Asia and Australia  are also well situated to see the asteroid around its closest approach.   But by the time Earth rotates enough for observers in the continental  United States to have a chance to see the asteroid, it will have receded  and faded to about the 11th magnitude. Radar astronomers plan to take  images of the asteroid about eight hours after closest approach using  the Goldstone antenna in California's Mojave Desert, which is part of  NASA's Deep Space Network. 2012 DA14 has not been in the catalogues for very long -- it was  discovered in February of 2012 by astronomers at the La Sagra Sky Survey  program in southern Spain and reported to the Minor Planet Center,  which designates minor bodies in our solar system. At the time of the  discovery, the asteroid had just made a fairly distant passage by Earth,  about seven times farther than the distance to the moon. Since 2012  DA14's orbital period around the sun has been about 368 days, which is  very similar to Earth's, the asteroid made a series of annual close  approaches. This year's is the closest approach, and is the closest the  asteroid will come for at least three decades. But this encounter will  shorten 2012 DA14's orbital period to about 317 days, changing its  orbital class from Apollo to Aten, and its future close approaches will  follow a different pattern.  This passage of 2012 DA14 by Earth is a record close approach for a  known object of this size. A few other known asteroids have flown by  Earth even closer, but those asteroids were smaller. On average, we  expect an object of this size to get this close to Earth about once  every 40 years. An actual Earth collision by an object of this size  would be expected much less frequently, about once every 1,200 years, on  average. src : Nasa </blockquote>

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