This animation shows flyby of asteroid 2012 TC4 as it passes near Earth on Columbus Day, 2017. We can’t yet predict exactly how close it will approach, but the data from previous observations suggests it will come no closer than 6,800 km from Earth’s surface. The current estimates of the asteroid’s size puts it in the 10 to 30 m range.
Animation Credit: NASA
Jerry Pournelle and Larry Niven were unavailable for comment.