Asteroid Apophis - which is the size of three and a half football fields - was discovered in June 2004 and gained infamy after a preliminary study suggested it had a 2.7 percent chance of hitting the Earth during its 2029 flyby. Subsequent observations ruled out an impact in 2029, but astronomers were closely studying Apophis' return in 2036.
Now, new observations of asteroid Apophis recorded Wednesday (Jan.9) have revealed the space rock poses no real threat to the Earth in 2036, NASA officials said. Astronomers tracked the asteroid as Apophis made a distant flyby of Earth at a range of about 9.3 million miles (15 million kilometers).
'The impact odds as they stand now are less than one in a million, which makes us comfortable saying we can effectively rule out an Earth impact in 2036," Don Yeomans, manager of NASA's Near-Earth Object Program Office, said in a statement. The office is based at the agency's Jet Propulsion Laboratory in Pasadena, Calif. [See Photos of Giant Asteroid Apophis]
'Our interest in asteroid Apophis will essentially be for its scientific interest for the foreseeable future,' Yeomans said.
And that scientific interest will be high.
When Apophis buzzes the Earth on April 13, 2029, it will come within 19,400 miles (31,300 km) of our planet. That's closer than some geostationary satellites, which orbit the Earth at a range of 22,370 miles (36,000 km), and will be the closest flyby of an asteroid the size of Apophis in recorded history, NASA officials said.
'But much sooner, a closer approach by a lesser-known asteroid is going to occur in the middle of next month when a 40-meter-sized asteroid, 2012 DA14, flies safely past Earth's surface at about 17,200 miles,' said Yeomans. 'With new telescopes coming online, the upgrade of existing telescopes and the continued refinement of our orbital determination process, there's never a dull moment working on near-Earth objects.'
Also on Wednesday, the European Space Agency announced that new observations of Apophis by the infrared Herschel Space Observatory revealed that the asteroid is about 1,066 feet (325 meters) wide, nearly 20 percent larger than a previous estimate of 885 feet (270 m). It is also 75 percent more massive than previous estimates, ESA officials said.
The new observations of asteroid Apophis this week were made by astronomers at the Magdalena Ridge observatory, operated by the New Mexico Institute of Mining and Technology, and the University of Hawaii's Pan-STARRS telescope. The observations were combined with data from NASA's Goldstone Solar System Radar to rule out any chance of a 2036 impact.
NASA astronomers regularly use telescopes on Earth and in space to search for any asteroids that may pose an impact threat to Earth.
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