What We Know About This Asteroid
Asteroid 2024 YR4 is a near-Earth asteroid.
When asteroid 2024 YR4 was discovered, it was estimated to have a very small chance of impacting Earth impact on Dec. 22, 2032. After more observations, NASA concluded it poses no significant impact risk to Earth in 2032 and beyond.
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On March 26, 2025, NASA’s James Webb Space Telescope captured images of asteroid 2024 YR4 that indicate the asteroid is about the size of a 15-story building.
NASA, ESA, CSA, STScI, Andy Rivkin (APL)
NASA Update on the Size Estimate and Lunar Impact Probability of Asteroid 2024 YR4
The planetary defense community continues to monitor the asteroid.
Experts at NASA’s Center for Near Earth Object Studies have updated 2024 YR4’s chance of impacting the Moon on Dec. 22, 2032, to 3.8% based on data from Webb and ground-based telescopes.
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Graphic of the possible locations - represented by yellow points - of asteroid 2024 YR4 on Dec. 22, 2032, as of Apr. 2, 2025.
NASA JPL/CNEOS
March 26, 2025
Webb Finds Asteroid 2024 YR4 is Building-Sized
Webb telescope imaged the asteroid in infrared light.
Webb images indicate the asteroid is about the size of a 15-story building.
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