Asteroid with ‘uncertain’ trajectory to graze earth on Mar. 7 — ‘It’s going to be close, real close’Scientist predict trajectory from between 19,000 miles and 10 million miles with uncertainty
There is a lot of news coverage of this, all pretty confident that this might be a near miss or perhaps a far one. Still, a 30 meter rock is pretty serious. I am sure if there was any realistic possibility of a hit, Obama would be invoking emergency measures to disarm everyone to discourage idiots trying to shoot it down. A 10 meter asteroid is Hiroshima sized energy release. Something 30 meters is 27 times the mass (volume and mass go up with third power of diameter), so about .5 megaton.