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Dimesions of "99942 Apophis" is 325 meters approximately. It will be the closest asteroid of its size in recorded history.
Initial observations indicated a probability of up to 2.7% (1/37) that it would hit Earth on April 13, 2029.
Possible impact effects
The Sentry Risk Table estimates that Apophis would make atmospheric entry with 750 megatons of kinetic energy. The impacts that created Meteor Crater or the Tunguska event are estimated to be in the 3–10 megaton range. The 1883 eruption of Krakatoa was the equivalent of roughly 200 megatons and the biggest hydrogen bomb ever exploded, the Tsar Bomba, was around 57 megatons. In comparison, the Chicxulub impact has been estimated to have released about as much energy as 100,000,000 megatons (100 teratons).
That means that there is a 97.3% chance that Apophis will NOT hit the earth on April 13, 2029, based on initial observations.