The asteroid has increased the chances of a "city-killer" asteroid colliding with Earth within eight years.
The space agency disclosed on Tuesday that the risk currently stands at 3.1 percent, a five percent increase from the previous forecast, or 1 in 32 chances of impact on December 22, 2032.
Astronomers estimate its diameter to be between 130 and 300 feet, based on its brightness. Analysis of its light patterns indicates a fairly typical composition, as opposed to being a rare metal-rich asteroid.
The last time an asteroid larger than 98 feet posed a significant threat was Apophis in 2004, when it briefly had a 2.7 percent chance of hitting the Earth in 2029 - a possibility later dismissed after further observations.
This is a developing story with further updates to be provided.
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