Very little is known about the asteroid’s physical properties. From its brightness, experts determine that its size could be anywhere from 100-300 meters - about 5-15x bigger than the 2013 #Chelyabinsk impactor #FICTIONALEVENT #PlanetaryDefense pic.twitter.com/xWTVbSPMZn

— ESA Operations (@esaoperations) April 26, 2019