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Asteroid 2025 PN7: Earth’s Tiny Quasi-Moon Discovered

9/13/2025

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Summary

Story summary

Astronomers discovered asteroid 2025 PN7, a quasi-moon trailing Earth since 1963.
This 62-foot-wide asteroid will remain in orbit for another 60 years.
Quasi-moons orbit the Sun while synchronizing with Earth's path, differing from traditional moons.
2025 PN7 is the smallest and least stable known quasi-satellite of Earth.
Its faintness necessitated professional-grade telescopes for detection, suggesting more undiscovered quasi-satellites may exist nearby.

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Story summary

Astronomers discovered asteroid 2025 PN7, a quasi-moon trailing Earth since 1963.
This 62-foot-wide asteroid will remain in orbit for another 60 years.
Quasi-moons orbit the Sun while synchronizing with Earth's path, differing from traditional moons.
2025 PN7 is the smallest and least stable known quasi-satellite of Earth.
Its faintness necessitated professional-grade telescopes for detection, suggesting more undiscovered quasi-satellites may exist nearby.