Astronomers have identified asteroid 2025 MN45, measuring 710 meters in diameter, which completes a full rotation every 1.88 minutes. Essa discovery occurred during the initial testing phase of the Observatório Vera C. Rubin, on the Chile, even before the official start of the main mission. The object stands out for surpassing known physical limits for large asteroids, without fragmenting despite the extreme speed of rotation.
The observation was carried out on just about ten hours of accumulated data, obtained over seven nights in 2025. In a short period, the equipment captured information about almost 2,000 new asteroids in Sistema Solar. 2025 MN45, located in the main belt between Marte and Júpiter, attracted immediate attention due to the light curve that reveals its accelerated rotation.
Surprising discovery in testing phase
The telescope, equipped with the largest digital camera ever built, with 3,200 megapixels, allows you to capture quick and detailed images of the sky. Essa capability made it possible to identify variations in brightness in distant objects with unprecedented precision.
During the analysis, the team detected 19 asteroids with super-fast rotations, all larger than 90 meters. Três of them, classified as ultrafast, rotate in less than five minutes, with 2025 MN45 setting the new record for objects above 500 meters.
The asteroid orbits in the main region of the asteroid belt. Sua rotational speed is equivalent to about 32 rotations per hour, which challenges traditional models of the structure of these celestial bodies.
https://twitter.com/Defence12543/status/2009319665638703541?ref_src=twsrc%5EtfwWhy Fast Spin Defies Expectations
Most large asteroids are considered piles of rubble, with fragments held together only by weak gravity. In Nesses cases, there is a rotational speed limit, estimated at about 2.2 hours per revolution for objects in the main belt, above which centrifugal force would disintegrate them.
The 2025 MN45 exceeds this limit by far. Para remains intact, it must have a high internal cohesion, similar to that of a solid rock or compact material, and not a loose agglomerate.
Researchers suggest that the asteroid may be a remnant fragment of a larger body destroyed in an ancient collision. Essa dense structure would explain the resistance to accelerated rotation.
Composition and origin of the record-breaking asteroid
Preliminary analyzes indicate that 2025 MN45 has properties that point to resistant material, possibly solid rock or compacted clay. Essa characteristic differentiates it from most known asteroids, which fall apart with smaller rotations.
Other fast asteroids identified in the same campaign include 2025 MJ71, with a period of 1.9 minutes, 2025 MK41 with a period of 3.8 minutes, 2025 MV71 with a period of 13 minutes, and 2025 MG56 with a period of 16 minutes. Todos provide valuable data on internal forces and collisional histories.
Location in the main belt allows studies of processes that shaped early Sistema Solar. Rotações extremes reveal information about chemical composition and violent events in the past.
Unique capabilities of the Observatório Vera C.
The observatory, jointly funded by Fundação Nacional of Ciência and Departamento of Energia of Estados Unidos, is positioned at Cerro Pachón, at Sua LSST camera captures images every 40 seconds, revealing rapid changes in the sky.
Even in the commissioning phase, the equipment has demonstrated that it can detect faint and distant objects with high temporal resolution. Essa ability opens doors to identify previously inaccessible asteroid populations.
The main mission, Legacy Survey of Space and Time, will map the sky every few days for ten years. Espera is expected to reveal millions of new asteroids and dynamic phenomena in Sistema Solar.
Implications for the study of Sistema Solar
Studying rotations like that of 2025 MN45 helps understand the formation and evolution of asteroids. Dados on speed and structure indicate past collisions and forces that acted on the origin of the planets.
The asteroid belt, previously seen as a static region, gains new prominence with discoveries of extreme objects. Anomalias like this refine theoretical models about cosmic materials and processes.
More detections expected soon
With the full start of operations, the observatory should identify many more fast-rotating asteroids. Cada new example contributes to reconstructing events that occurred billions of years ago.
The 2025 MN45 represents just the beginning of a series of surprises. Rubin technology turns the asteroid belt into an active field of research.