Suitcase-sized asteroid slips past NASA’s early warning system, strikes Earth hours after detection—third instance in 2024

A small asteroid, designated 2024 UQ, struck Earth just hours after detection on October 22, highlighting a close call with space objects slipping past early monitoring. The asteroid, spotted by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey in Hawaii, was observed only two hours before it disintegrated over the Pacific Ocean. While the 3-foot asteroid posed no threat, its sudden detection underscores the importance of bolstering space surveillance.

ATLAS survey and the discovery timeline

The ATLAS survey, a four-telescope system tasked with tracking near-Earth objects, first observed the asteroid in images captured on October 22. European Space Agency (ESA) officials noted that while ATLAS’s images initially included detections of 2024 UQ, it was only recognized as a moving object hours later. Due to the asteroid’s position near the edge of two adjacent fields, it bypassed immediate tracking by impact monitoring systems.

ESA explained, "ATLAS survey obtained images that included detections of a small object in a high-probability collision course. However, due to the location of the object near the edge of two adjacent fields, the candidate was recognized as a moving object only a few hours later." By the time astrometry data reached impact monitors, the asteroid had already entered Earth's atmosphere.

2024’s third imminent impactor

According to ESA, 2024 UQ marked the third asteroid this year classified as an “imminent impactor” — objects detected only hours before impact. The incident highlights the strengths and gaps in current tracking systems and reinforces the need for continued investment in early detection technologies. Though this asteroid’s small size posed no danger, the event draws attention to the potential threat of larger objects going undetected until late.