Apophis broke the record for the highest level on the Torino Scale (level 4), before it was lowered

Apophis asteroid would pass through a gravitational keyhole, a small region no more than about 800 m (half a mile) wide,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, when the probability that Apophis would pass through the keyhole was determined to be very small. Apophis broke the record for the highest level on the Torino Scale, being, for only a short time, a level 4, before it was lowered.

The diameter of Apophis is approximately 325 metres (1,066 ft)

 

Apophis passed within 0.0966 AU (14,450,000 km; 8,980,000 mi) of the Earth in 2013, allowing astronomers to refine the trajectory for future close passes.

While an impact in 2036 is practically impossible, a NASA assessment as of 21 February 2013 gives an impact probability of 2.3 out of a million for 2068.

The exact effects of any impact would vary based on the asteroid’s composition, and the location and angle of impact. Any impact would be extremely detrimental to an area of thousands of square kilometers, but would be unlikely to have long-lasting global effects, such as the initiation of an impact winter

Assuming Apophis is a 325-meter wide stony asteroid, if it were to impact into sedimentary rock, Apophis would create a 4.3 kilometers (2.7 mi) impact crater

it was estimated that the hypothetical impact of Apophis in countries such as Colombia and Venezuela, which are in the path of risk, could have more than 10 million casualties. An impact in the Atlantic or Pacific oceans would produce a devastating tsunami

Apophis is one of two asteroids under consideration by the European Space Agency as the target of its Don Quijote mission to study the effects of impacting an asteroid

 

Source: http://en.wikipedia.org/wiki/99942_Apophis

 

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