2019 DN, measures between 298 and 656 feet wide, according to NASA, but it will pass Earth around 13 lunar distances away. So 2019 DN’s flyby will be very far away from us — approximately 3,105,700 miles away. The asteroid that exploded above Chelyabinsk, Russia, in 2013 — injuring 1,500 and damaging thousands of buildings — measured about 65 feet wide. But even if 2019 DN were to change course, NASA says, its impact could do some damage but nothing apocalyptic.