NASA expected the two asteroids to make a so-called "Earth Close Approach" in the early morning hours. The first of the two, doubled Asteroid 2019 BK4, swung around at. 29.00 GMT (Wednesday, February 6). The second asteroid, Asteroid 2013 RV9, followed shortly after. 6.30 GMT. Asteroid RV9 is the largest of the space rocks estimated to be towers over the Big Ben's clock tower and rival st. Paul's Cathedral in London.
But the much smaller BK4 introduces probably at an estimated 32.4 to 72 ft (9.9 m to 22 m) in diameter.
The asteroid is also significantly faster, according to NASA's California-based Jet Propulsion Laboratory (JPL).
Asteroid BK4 passed our home plan this morning at breakneck speeds of more than 20.500mph (9.18km per second).
A similar sized asteroid hit Earth in 2013, as an undiscovered space rock threw into the atmosphere from the sun's direction.
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The so-called Chelyabinsk Meteor exploded in the air over Russia with the power of 30 Hiroshima nuclear bombs.
Lindley Johnson, NASA's planetary defense officer, called the event a "cosmic wake-up call" to the dangers that lurk in space.
He said, "We must look at what we know is out there to be found."
Today NASA Asteroid BK4 ill approached the planet from a distance of approx. 989,979 km (1.59 million km).
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This corresponds to 4.14 Lunar distances (LD) or 4.14 times the distance from Earth to the Sun.
Five hours later, the Asteroid RV9 slid the twilight of the planet from a much longer distance – approx. 0.04574 astronomical units (au).
An astronomical unit is the distance between the earth and the sun, which measures about 93 million miles (149.6 million km).
Asteroid RV9 cuts this down to about 4.25 million miles (6.8 million miles).
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This corresponds to 17.8 times the distance between the ground and the moon.
NASA's JPL estimates RV9 measures somewhere in the range of 167.3ft to 360.9ft (51m to 110m) in diameter.
At the upper end of the scale, the asteroid stands higher than the Elizabeth Clock Tower in Westminster, London, home to Big Ben.
But even towards the lower end of the estimate, the space rock is higher than The Arc de Triomphe in Paris, France.