They were unable to forecast when it will certainly return as a result of the absence of monitorings on its orbit.
The asteroid's closest approach to our planet will come at 6:05 p.m. EDT (22:05 UTC) on May 15, when 2010 WC9 will pass just 126,419 miles (203,451 kilometers) from Earth - at exactly 0.53 lunar distances.
The asteroid 2010 WC9, discovered for the first time in the Catalina sky survey in Arizona on November 30, 2010, returned to another visit and will be delivered at an incredibly short distance from our half-moon.
This will be the second time in a month that an asteroid has flown this close to Earth. After a few weeks, the scientists lost track of the asteroid.
The Minor Planet Center indicates that 2010 WC9 is an Apollo type asteroid, just like the infamous Chelyabinsk meteor that exploded over Russian Federation in 2013, injuring around 1,500 people. Estimates of asteroid 2010 WC9's diameter range from 197 to 427 feet (60-130 meters); estimates of the Chelyabinsk meteor's size before encountering Earth's atmosphere center around 65 feet (20 meters). Pacific time, is the closest approach of this particular asteroid in almost 300 years, according to EarthSky.
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Unfortunately for all you stargazers, the asteroid won't be visible to the eye as it flies past Earth.
The asteroid measures between 197 and 427 feet in diameter - longer than a football field - and travels at speeds of 28,655 miles per hour, according to EarthSky.
"The broadcast will last less than 25 minutes, since the asteroid will cross our field of view during this time period".
On May 8, after nearly eight years, astronomers found an asteroid, which they eventually figured out was the returning 2010 WC9.
"The asteroid will be moving quite rapidly (30 arc seconds per minute)". We are of course collecting astrometric data whilst this is happening, but the motion of the asteroid will be apparent every five seconds!
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"We have discussed unusual objects 2010 with WC9 with EarthSky!".
The object was reportedly imaged twice. It can be inferred from this that the asteroid would pass somewhere midway in between the moon and the Earth.
Experts say that an asteroid longer than a football field will soon be uncomfortably close to our Earth.
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