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: Asteroid Heading Towards Earth, but Don't Worry About an Interception



From: Roger Greenway, ENN
Published February 3, 2013 09:30 AM

Asteroid Heading Towards Earth, but Don't Worry About an Interception

On Super Bowl Sunday, we are thinking more about football than asteroids hurtling through space that might intercept planet Earth! Turns out, one is heading our way, and on Feb 15th will pass pretty close to our planet.

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The small near-Earth asteroid 2012 DA14 will pass inside the ring of geosynchronous weather and communications satellites that orbit Earth. 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.

Asteroid image via Shutterstock.

Read more at NASA.

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