Asteroid Bennu Has a Chance for Gigaton Impact Around 2175-2199
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The Palermo Technical Impact Hazard Scale
Palermo Scale
-1.42
XB (-2.82
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101955 Bennu
99942 Apophis (-2.83
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Summary
The Palermo Technical Impact Hazard Scale for asteroids is a logarithmic scale used by astronomers to rate the potential hazard of impact of a near-earth object (NEO). 25 more have a cumulative Palermo Scale value of above -4, three of them having been discovered in 2019.Bennu has a cumulative 1-in-2,700 chance of impacting Earth between 2175 and 2199. 2002 NT7 is no longer considered to pose any risk and was removed from the Sentry Risk Table on 1 August 2002.For a brief period in late December 2004, with an observation arc of 190 days, asteroid (99942) Apophis held the record for the highest Palermo scale values, with a value of 1.10 for a possible collision in the year 2029.
As said here by Brian Wang