NASA has narrowed down when this city-killer asteroid could reach earth
NASA has spent years improving how it tracks near-Earth objects, and asteroid monitoring is now a routine part of planetary defense. That work has put one specific asteroid, Bennu, in sharper focus, with NASA identifying one future date that stands out more than the rest. The agency has not said an impact will happen, but it has said the date deserves attention in its long-range modeling.
NASA narrowed the timeline to one key date
NASA has identified September 24, 2182, as the most significant single date in its modeled impact scenarios for asteroid Bennu. According to NASA’s Bennu tracking and mission analysis, that date carries the highest individual probability among the possible future encounters that scientists have calculated. The asteroid is about one-third of a mile wide, making it large enough to cause catastrophic regional damage if it ever struck Earth.
NASA knows Bennu unusually well because of the OSIRIS-REx mission, which traveled to the asteroid, collected a sample in 2020, and returned that material to Earth in 2023. The agency said that close-up study gave scientists a much clearer picture of Bennu’s orbit, shape, and surface behavior than telescope observations alone. That is why this date is tied to detailed measurements rather than a rough estimate.
What is confirmed about the Earth risk right now
What is confirmed is that Bennu remains unlikely to hit Earth, even with a date attached to the calculations. NASA has described the 2182 scenario as extremely unlikely, and the often-cited risk level is about 1 in 2,700 based on the modeled paths highlighted in the source material. What is not confirmed is any impact location, because NASA has not said Bennu is on a guaranteed collision course with Earth.
There is also an earlier date that matters: September 25, 2135. NASA expects Bennu to make a close flyby of Earth then, and that pass is important because Earth’s gravity could slightly shift the asteroid’s later path. Scientists have said future observations after that 2135 encounter will help refine the numbers again.
Why Bennu gets so much attention from NASA
The main reason Bennu gets close scrutiny is that small forces can matter over long stretches of time. NASA has said effects such as gravity and the Yarkovsky effect, where absorbed sunlight is later released as heat, can slowly nudge an asteroid’s orbit over decades. In Bennu’s case, those changes matter because they can alter how the asteroid moves after the 2135 flyby.
NASA has also pointed to a possible gravitational keyhole scenario tied to that 2135 pass. If Bennu were to move through a very small region of space during the flyby, Earth’s gravity could redirect it onto a later impact path, including the 2182 scenario. For residents and travelers on Earth today, the practical reality is unchanged: Bennu is not an emergency now, and NASA has more than 150 years to keep refining the risk and, if needed, use lessons from missions such as DART in 2022.
