Astronomers Identified Asteroid With Extreme Rotation
Researchers discovered a large asteroid that completes a full rotation every 4.18 minutes.
Updated on Oct. 14, 2026 in Space
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Astronomers have identified asteroid 491384 as a massive body that rotates at an extreme speed. The object completes a full rotation in just 4.18 minutes, far exceeding the typical spin barrier for asteroids of its size.
Why it matters
Rapid rotation generates centrifugal forces that pose a structural threat to asteroids held together by gravity. Understanding these extreme objects helps scientists refine their knowledge of asteroid formation and evolution.
Asteroid 491384 measures approximately 2.53 km in diameter and completes a rotation in 4.18 minutes. This defies the standard spin barrier of 2.2 hours usually observed in asteroids larger than 150 meters.
The players
arXiv
This is an open-access archive for scholarly articles in the fields of physics, mathematics, computer science, and quantitative biology.
The details
The research team developed custom automated software to analyze incomplete telescope observations and detect periodic light fluctuations caused by irregular shapes. From a total sample of 9,417 asteroids, they successfully flagged 66 candidates exhibiting super-fast rotation patterns.
Timeline
October 14, 2026: The research findings were published on the arXiv server.
The Big Picture
This discovery marks a departure from the established asteroid spin barrier threshold by identifying an object that rotates significantly faster than theoretical models suggest.
While this finding does not currently impact daily life, it refines the models scientists use to understand near-Earth objects. Improved understanding of asteroid structural integrity could eventually assist in future planetary defense strategies.
The takeaway
This discovery illustrates the complexity of asteroid structural evolution in space. Scientists expect that analyzing larger volumes of telescopic data will continue to reveal extreme objects that challenge current physics.
Further reading
For more information on recent astronomical findings, visit the Space section.
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