The formidable asteroid, dubbed Asteroid 2019 LB, shot past the Earth today (Wednesday, June 12). NASA's asteroid trackers at the California Jet Propulsion Laboratory (JPL) have warned the asteroid would fly by on a so-called Earth-Close Approach trajectory. The news comes a month after astronomers first observed the rock in space on May 7. And according to NASA's JPL, the asteroid made its closest approach around 3.38pm BST (10.38am EST).
Asteroid LB is an Apollo-type space rock zipping around the inner circles of the solar system.
The JPL estimates LB measures somewhere in the range of 82ft to 180.5ft (25m to 55m) in diameter.
At the upper end of NASA's estimate, the space rock is comparable in size to about six-and-a-half London double-decker buses.
And if that is not terrifying enough, the asteroid is flying around the Sun at speeds exceeding 6.05km per second or 1
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On this speedy orbit, the asteroid follows a path similar to its namesake asteroid, 1862 Apollo. asteroid's trajectory does not take it beyond the Asteroid Belt in-between Mars and Jupiter, NASA class According to NASA, an NEO is a "asteroid or comet with a perihelion distance less than or equal to 1.3 astronomical units."
One astronomical unit translates into about 93 million miles (149.6 million km), which is the distance between the Earth and the Sun.
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What this means, is asteroids like LB orbit the Sun from a maximum distance of around 120.8 million miles (194.5 million km).
And occasionally, these imposing space rocks will cross paths with the Earth's own orbit of the Sun.
NASA said: "As they orbit the Sun, Near-Earth Objects can occasionally approach close to Earth.
" Note that a 'close' passage astronomically can be very far away in human terms: millions or even tens of millions of kilometers. "
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So how close did the asteroid fly by the Earth this afternoon?
According to NASA's calculations, the space rock's closest approach equaled around 0.02336 astronomical units.  In other words, the space rock safely shot by from a distance of more than 2.1 million miles (3.49 million km).
The distance in question is roughly the equivalent of 9.09 times the distance between the Earth and the Moon.