CAPE CANAVERAL,
Fla. (Reuters) - NASA is monitoring a 100-foot (30-meter) wide asteroid
that could make a close pass by Earth next month but has no chance of
hitting it, the U.S. space agency said on Friday.
First spotted in 2013, the asteroid could fly as close as
11,000 miles (17,700 km) from Earth on March 5, according to scientists
at NASA’s Jet Propulsion Laboratory in Pasadena, California.
That is roughly 1/20th the distance from Earth to the moon
and about half as far as many communications satellites that ring the
planet.
But
given uncertainty about the precise path of the asteroid, known as 2013
TX68, it also could end up as far as 9 million miles (14 million km)
from Earth during its flyby.
The asteroid was visible for just three days during its
last approach to Earth in 2013 before it passed into daytime skies and
could no longer be tracked.
“It will be hard to predict where to look for it," NASA’s
Paul Chodas, who manages the agency’s Near-Earth Objects Studies office,
said in a statement.
NASA said there is a one-in-250 million chance of an impact during
the asteroid’s next pass on Sept. 28, 2017, though future observances
are likely to reduce that probability even further.
"The possibilities of collision on any of the three future
flyby dates are far too small to be of any real concern," Chodas said.
The asteroid is about twice the size of the one that
exploded over Chelyabinsk, Russia, in 2013. That blast shattered glass
and destroyed buildings, leaving more than 1,000 injured.
If an asteroid the size of 2013 TX68 passed into Earth’s
atmosphere and exploded, NASA estimates it would likewise be about twice
as powerful as the Chelyabinsk blast.
(Reporting by Irene Klotz; Editing by Colleen Jenkins and Alden Bentley)
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