It was the largest known asteroid to ever pass that close to Earth in observational history.SURPRISE ASTEROID FLYBY: With little warning, on Sunday, April 15th,2018 GE3 was discovered just the day before as it plunged inward from the asteroid belt. At its closest point, the asteroid – called 2018 GE3 – was just 119,500 miles away from Earth's atmosphere, about half the distance between Earth and the moon, according to NASA's Center for Near Earth Object Studies (CNEOS). Its size is 3 to 6 times that of the space rock that penetrated the skies over Chelyabinsk, Russia in 2013. pic.twitter.com/WNT6z8KuZY

The “medium-sized” space object is reportedly over three times the size of a meteor that entered the atmosphere over Russia in 2013 and injured more than 1,000 people. NASA, which funds the Catalina Sky Survey, noted that 2018 GE3 passed even closer to the moon about four hours after its close call with Earth. 2018 GE3 could be 5 to 6 times wider than that object.Based on an observational arc of only 1 day, 2018 GE3 appears to follow an elliptical orbit which stretches from the asteroid belt to deep inside the inner solar system.
An asteroid, 2018 GE3, sized between 37 and 138 metres (121 and 453 ft) passes 193,000 kilometres (120,000 mi) from Earth, possibly the largest known asteroid to ever pass that close in observational history.