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The following table summarizes by object the potential future Earth impact events that the JPL Sentry System has detected based on currently available observations.
Click on the object designation to go to a page with full details on that object.
There can be several qualitatively unique pathways to impact in a given year, e.g., some with an extra revolutions around the sun, others deflected to impact by an earlier planetary encounter. This is an estimate based on the absolute magnitude, usually assuming a uniform spherical body with visual albedo p V = 0.154 (in accordance with the Palermo Scale) but sometimes using actual measured values if these are available.
Since the albedo is rarely known for objects on this page, the diameter estimate should be considered only approximate, but in most cases will be accurate to within a factor of two.
This page provides information about calculating the risk of a Down’s syndrome pregnancy. For example, a risk of Down's syndrome of 1 in 100 means that if 100 women have this test result, we would expect that 1 of these women would have a baby with Down's syndrome and that 99 would not.
Small objects are not likely to cause significant damage in the event of an impact, although impact damage does depend heavily upon the specific (and usually unknown) physical properties of the object in question.In order to become pregnant, sperm must unite with the egg in the fallopian tube.