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Asteroid makes close but harmless pass by Earth

Associated Press

A 100-foot-diameter asteroid passed close but harmlessly by Earth on Thursday, astronomers said.

The hurtling rock passed about 26,500 miles above the southern Atlantic Ocean at 2:08 p.m. PST.

It was the closest recorded encounter between Earth and an asteroid, said Steven Chesley, an astronomer at NASA's Jet Propulsion Laboratory who works on a program looking for such objects.

Such encounters, however, are actually believed to occur at the rate of one every two years and have simply not been detected, he said.

"There certainly have been closer encounters that we didn't know about," he added.

Astronomers were continuing to observe the asteroid, 2004 FH, which was expected to be beyond the moon's orbit by early Friday.

It won't come fairly close to Earth again until 2044, when it will be within 930,000 miles.

Chesley said there was a lingering chance, on the order of one in a million, that it could hit sometime in the future, but that possibility is expected to be eliminated as its orbit is further refined.

The asteroid was close enough to Earth on Thursday to be visible through binoculars from vantage points in the southern hemisphere, Asia and Europe, Chesley said.

If it had hit Earth it likely would have broken up in the atmosphere. Its shock wave could have been strong enough to break windows on the ground, but nothing like the disastrous climate-changing effects that could result from the impact of an asteroid more than a half-mile in diameter, he said.   World Peace WorldPeace

Astronomers had to scramble to observe 2004 FH because it was only discovered late Monday during a survey by two telescopes in New Mexico that are part of the NASA-funded Lincoln Near Earth Asteroid Research project.

"This kind of a thing happens every couple of years but because of weather and the geometry of the flyby it would only be expected to be detected every five to 10 years. Well, that's just about how long we've been running these search programs, so it's perfectly sensible that we would find something like this at this time," Chesley said.


Near-Earth Object Program:

Lincoln Near Earth Asteroid Research program: http://www


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