2018 GE3, by comparison, is between 200 and 400 feet (48-110 meters) in diameter, or more like the size of a large warehouse. This puts it into the same class as the 60-meter Tunguska impactor that leveled a forest in Siberia in 1908.
According to EarthSky.org, Asteroid 2018 GE3 could be as much as six times bigger than the Chelyabinsk meteorite, which exploded over central Russian Federation in 2013. 2018 GE3 could be 5 to 6 times wider than that object. If GE3 had entered Earth's atmosphere it could have caused similar, if not more severe, damage. Nonetheless, it is a substantial asteroid, showing how even big area rocks can still take us by surprise. 2018 GE3 was found less than a day before before its closest approach.
Based upon an observational arc of just 1 day, 2018 GE3 appears to follow an elliptical orbit which extends from the asteroid belt to deep inside the inner planetary system. Yesterday, an asteroid three to six times larger than that rock came out of nowhere and passed by the Earth at a distance of 119,500 miles, about half the distance to the moon-and scientists only had a few hours' warning before it closed in. An interactive 3D orbit of the asteroid is available from JPL: explore it here!