A massive asteroid has caught the attention of astronomers by setting a new speed record for how fast it rotates on its axis. This asteroid, known as 2025 MN45, measures 710 meters in width, just under half a mile. What makes this asteroid particularly remarkable is its rotation speed: it completes one full rotation in less than two minutes, making it the fastest-spinning asteroid with a diameter exceeding 500 meters ever discovered.
Discovered using the Vera C. Rubin Observatory in Chile, this asteroid is part of a group of 19 large fast-rotating asteroids identified with the telescope. The groundbreaking discovery was presented at the annual American Astronomical Society meeting and published in the Astrophysical Journal Letters by researchers from the U.S. National Science Foundation National Optical-Infrared Astronomy Research Laboratory (NOIRLab) and the Department of Energy’s SLAC National Accelerator Laboratory, among others.
Studying the size, spin, and composition of these asteroids could provide valuable insights into their formation and offer clues about the early solar system. According to Sarah Greenstreet, an assistant astronomer at NOIRLab, the high rotation speed of 2025 MN45 suggests that it must be made of material with exceptional strength to withstand such rapid spinning. This finding challenges the conventional belief that most asteroids are composed of a mixture of rock, dust, ice, and debris, indicating that this particular asteroid may be more solid in nature.
The Rubin telescope, set to commence a 10-year survey of the night sky soon, will capture snapshots every three days, generating a staggering 20 terabytes of data nightly—more than 350 times the data produced by the James Webb Space Telescope. Regina Rameika, the Department of Energy’s associate director for High Energy Physics, emphasized the significance of the observatory’s advanced capabilities in pushing the boundaries of astronomical observation and enabling groundbreaking discoveries like the exceptionally fast-rotating asteroid.
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