Observatório Vera Rubin, located north of Chile, identified asteroid 2025 MN45, which has the fastest rotation ever recorded for objects with a diameter greater than 500 meters in the solar system. Esse celestial body, about 710 meters long, completes a complete revolution in just 1.88 minutes, defying the known limits of stability for asteroids.
The discovery occurred during the commissioning phase of the observatory, in observations carried out between April and May 2025. The data was analyzed by a team led by astrophysicist Sarah Greenstreet and recently published in a specialized scientific journal.
This rotation speed overcomes the so-called spin barrier, which establishes a limit of approximately 2.2 hours for objects composed of loose fragments held together only by gravity. The behavior of 2025 MN45 indicates that it has high internal cohesion, characteristic of monolithic rocks.
- Estimated diameter: 710 meters;
- Rotation period: 1.88 minutes;
- Location: main asteroid belt, between Marte and Júpiter;
- Suggested type: solid composition, possibly C-type.
Characteristics of the record-breaking asteroid
Asteroid 2025 MN45 stands out for its stability despite extreme rotation. Cientistas calculate that it needs internal resistance comparable to that of solid rock to not fragment under centrifugal forces.
This property differentiates it from most main-belt asteroids, generally formed by clumps of debris known as rubble piles. The high cohesion suggests formation from denser primordial material.
🚨 SCIENTISTS FOUND A MASSIVE SPACE OBJECT — Is MN45 Just an Asteroid or ALIEN SHIP ?🚨😱
— 3I/ATLAS updates (@Defence12543)January 8, 2026
😳Astronomers have detected a massive asteroid bigger than eight football fields — and it’s spinning so fast that, by all known rules, it should have become itself apart.
🪨Meet Asteroid…pic.twitter.com/VDBZpQ4Zgy
How Observatório Vera Rubin works
The Observatório Vera Rubin uses the LSST camera, the largest digital camera ever built, capable of capturing detailed images of the sky every 40 seconds. Essa capability allows you to record brightness variations that reveal rotation periods of distant objects.
During ten years of planned operation, the equipment will produce a dynamic record of the southern celestial hemisphere. The sequential imaging technique makes it easier to detect subtle changes in thousands of smaller bodies.
Composition and stability of asteroids
Asteroids larger than 150 meters in diameter generally respect the 2.2-hour rotation limit to avoid disintegration. Objetos that overcome this barrier have significant internal strength.
2025 MN45 represents the first documented case of such rapid rotation on a scale of hundreds of meters in the main belt. Sua integrity indicates material with high tensile strength.
Other recent discoveries from the observatory
The same analysis identified 19 rapidly rotating asteroids, including 16 superfast and three ultrafast. Todos have dimensions greater than 90 meters.
Among them, 2025 MJ71 stands out, with a period of 1.9 minutes, and 2025 MK41, with 3.8 minutes. Essas detections expand knowledge about compositional diversity in the solar system.
Context of the main asteroid belt
The main belt is home to most known asteroids, located between the orbits of Marte and Júpiter. Esses objects preserve remnant material from the formation of the solar system billions of years ago.
Past collisions can accelerate rotations by ejecting fragments with high angular momentum. 2025 MN45 possibly originates from the dense nucleus of a destroyed larger body.
Importance of LSST Camera
The Observatório Vera Rubin’s LSST camera collects light from a wide area of the sky with unprecedented precision. Essa technology allows us to observe variations in brightness that define asteroids’ light curves.
The light curves of 2025 MN45 show regular oscillations corresponding to the period of 1.88 minutes. The data confirms the elongated shape and variable reflective surface.
Published scientific analysis
The study on 2025 MN45 appeared in The Astrophysical Journal Letters based on observations from seven consecutive nights. The team used about ten hours of data to determine orbital and physical parameters.
The object’s color indices point to C-type classification, common in carbonaceous asteroids. Essa composition reinforces the hypothesis of resistant primitive material.
Orbital details of 2025 MN45
The asteroid follows an almost circular orbit with a low eccentricity of 0.02 and an inclination of 9.9 degrees in relation to the ecliptic plane. Esses parameters keep it stable in the main belt.
Its absolute magnitude of 18.7 allowed accurate size estimation assuming typical albedo of 0.15. Future Observações will refine these values.
Comparison with known fast asteroids
Previously, fast asteroids were concentrated in populations close to Terra, which were easier to observe. The 2025 MN45 sets a new standard for objects far from the main belt.
Its rotation surpasses previous records for diameters above 500 meters. The discovery demonstrates Vera Rubin’s ability to detect rare phenomena.
Observatório Vera Rubin has continued regular operations since October 2025, honoring the astronomer who provided early evidence of dark matter. The Legacy Survey of Space and Time project will map billions of objects over the decade.
The identification of asteroids such as 2025 MN45 contributes to understanding the dynamic evolution of the solar system. Accumulated Dados will assist formation models and ancient collisions.
