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The thing is, the predicted orbit of anything we havent been observing for months is not a line, its a cone, with the extremeties of the cone describing orbits given by the data we have with the maximum amount of error applied. Earth is in the cone for this asteroid, therefore it is possible given the data we have that it could strike us.
As we observe it for longer, we can get more accurate information, the cone gets narrower, and in all probability the rock wont end up coming closer than a few million kilometers.
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