This will be the second time in a month that an asteroid has flown this close to Earth.
After its initial discovery in 2010, researchers lost track of the asteroid for some eight years before rediscovering it on May 8.
The asteroid is known as the "lost" asteroid because for nearly 8 years after it was last observed scientists couldn't see it in space. Just recently, asteroid 2018 GE3 zipped by our planet and barely missed hitting it, and it was discovered only after it had already passed.
It will pass within 126,419 miles of Earth, or about half the distance from our planet to the moon.
It is being said that the space rock has completed its orbit and now comes back to the Earth. After just 21 hours after the asteroid was observed in the laboratory in Arizona, it is closer to Earth at a distance of less than 200 thousand kilometers.
Though it won't be visible to the naked eye during the flyby, astronomers predict small telescopes might give a faint view of the space rock if pointed in the direction at the right time.
Astronomers said 2010 WC9 orbits the sun every 1.12 years. The asteroid will move pretty fast (30 seconds of arc per minute).
"Our Astrometric information while this occurs, but the motion of the asteroid will happen every five minutes", explained Wells.