It's estimated to be about 0.7 miles wide, making it similar in size to the world's tallest building, the Burj Khalifa in Dubai.
Travelling at speeds of 107,826kmh, it's almost 15 times faster than the world's quickest manned aircraft - the hypersonic North America X-15, which can reach speeds of 7,300kph, The Daily Mail reported.
Nasa classifies an asteroid as "hazardous" if it comes within 4,600,000 miles - putting this one well within the realm of danger.
Nasa have classed it as a "potentially hazardous" but do not think it will strike the Earth (file photo)How big is the asteroid? It will be the biggest and fastest space object to fly near Earth this year, according to The Daily Star. The average temperature around the globe would likely drop by as much as 8 degrees Celcius, according to a study in 2016, ultimately leading to a new ice age.
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'These would not be pleasant times, ' Charles Bardeen, of the National Center for Atmospheric Research said during a presentation at the American Geophysical Union (AGU) at the time. Most probably the asteroid will skim past Earth on February 4. There are now over 600,000 known asteroids in our solar system. A test with a small, nonthreatening asteroid is planned for 2024. In 2024, it will be subject to a Double Asteroid Redirection Test (DART), which will make use of kinetic energy to force a change in the direction of the asteroid.
However, the key to mitigating damage is to find any potential threat as early as possible.
Recently, more asteroids have been flying close by our planet, with a few giant rocks passing by in December of previous year alone.
Asteroid 2018 AJ was discovered by NASA on January 5. There are about 1,000 such known space objects monitored by NASA.
An 18-metre asteroid that hit the city of Chelyabinsk in Russian Federation in 2013 exploded with the force of 500,000 tonnes of TNT.