By Jim Snyder
An asteroid half the size of a U.S. football field will pass between Earth and orbiting satellites next week, sparing the human race from the fate suffered by dinosaurs, NASA said.
The 150-foot diameter asteroid, named 2012 DA14, will pass about 17,000 miles above Earth on Feb. 15 -- lower than the orbits of some satellites -- in the closest recorded approach of an object of its size. It will travel at 7.8 kilometers a second (17,400 miles an hour), or about eight times the speed of a rifle shot, NASA scientists said yesterday.
“No Earth impact is possible,” Donald Yeomans, who manages the Near-Earth-Object office at Pasadena, California- based Jet Propulsion Laboratory, said yesterday in a press conference.
The NASA unit monitors relatively small space objects such as DA14 to measure the risks they present to the Earth. Researchers said that studying the asteroid’s close trajectory will help NASA in preparing for a 2016 rocket launch and a planned encounter with the near-Earth object 1999 RQ36 two years later.
Lockheed Martin Corp., based in Bethesda, Maryland, is helping NASA in developing the rocket, which is scheduled to monitor RQ36 and eventually return to Earth in 2023 with samples from the asteroid.
While a strike by an asteroid DA14’s size would do “a lot of regional destruction,” it wouldn’t be catastrophic to the planet’s population, said Lindley Johnson, program executive for NASA’s Near-Earth Object observations program in Washington.
Space Station Safe
Yeomans said the damage from DA14 if it were to hit would rival an impact event in Russia in 1908 that leveled trees over an 820-square-mile territory. The asteroid that is thought to have wiped out the dinosaurs was about 10-kilometers in diameter. DA14 was discovered in February last year.
The NASA scientists said the asteroid would still pass above the orbits of most of the communications satellites circling Earth, and doesn’t pose a threat to the International Space Station, which orbits the planet at about 250 miles.
Amateur astronomers will need a small telescope to see the asteroid, which would appear as a moving pinpoint in the night sky, said Timothy Spahr, the director of the Minor Planet Center in Cambridge, Massachusetts. The best viewing location for DA14’s closest approach is Indonesia, with sky gazers in Eastern Europe, Australia and Asia also getting good looks at the asteroid.
The NEO program office said that an object of similar size gets this close to Earth once every 40 years, and that an actual collision can be expected only once in 1,200 years.
Some companies and entrepreneurs see asteroids as possible sources for precious metals.
Planetary Resources Inc., based in Seattle and backed by Google Inc. Chief Executive Officer Larry Page and Chairman Eric Schmidt, is working to launch a telescopic space surveyor to identify resource-rich space rocks in the next couple of years.
Other entrepreneurs are participating in a business-backed space race. Robert Bigelow, a Las Vegas hotelier, won a $17.8 million for an inflatable room that will be attached to the space station in 2015. Boeing Co., Tesla Motors Inc. Chief Executive Elon Musk and British entrepreneur Richard Branson have started rocket-building ventures.
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Source: http://www.bloomberg.com/news/2013-02-0 ... -says.html