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"Russia 'plans to stop asteroid'" [ The head of Russia's federal space agency has said it will work to divert an asteroid which will make several passes near the Earth from 2029. ]
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.... However, a possibility remains that during the 2029 close encounter with Earth, Apophis will pass through a gravitational keyhole, a precise region in space no more than about 600 meters across, that would set up a future impact on April
13, 2036. This possibility kept the asteroid at Level 1 on the Torino impact hazard scale until August 2006. It broke the record for the highest level on the Torino Scale, being, for only a short time, a level 4, before it was lowered. .... Based upon the observed brightness, Apophis' length was estimated at 450 metres (1,500 ft); a more refined estimate based on spectroscopic observations at NASA's Infrared Telescope Facility in Hawaii by Binzel, Rivkin, Bus, and Tokunaga (2005) is 350 metres (1,100 ft). ..... NASA initially estimated the energy that Apophis would have released if it struck Earth as the equivalent of 1,480 megatons of TNT. A later, more refined NASA estimate was 880 megatons.[2] The impacts which created the Barringer Crater or the Tunguska event are estimated to be in the 3?10 megaton range[17] The 1883 eruption of Krakatoa was the equivalent of roughly 200 megatons. .... ]
Survivists better buy big umbrellas.