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Earth has gained an additional moon as a small asteroid enters its orbit

by Emma Citizen
0 comment 2 minutes read
Earth

Earth is set to welcome a temporary new companion in the form of a small asteroid, designated 2024 PT5, which will become a “mini-moon” from September 29 to November 25, 2024.

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This celestial event is notable as it marks another instance of Earth capturing an asteroid into its orbit, albeit for a brief period.

Overview of 2024 PT5

  • Size: The asteroid measures approximately 33 feet (10 meters) in diameter, making it relatively small compared to the Moon.
  • Discovery: It was first detected by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on August 7, 2024.
  • Orbit: During its time as a mini-moon, 2024 PT5 will follow a horseshoe-shaped trajectory, completing one orbit around Earth in about 57 days before being flung back into its original solar orbit.

Historical Context

Earth has previously captured other mini-moons, such as:

  • 2022 NX1, which orbited Earth briefly in both 1981 and 2022.
  • 2020 CD3, which was bound to Earth for several years before escaping in 2020.

These mini-moons are typically asteroids that approach Earth at the right velocity and angle to be captured by its gravity. Researchers estimate that there may be around one mini-moon the size of a dishwasher within the Earth-Moon system at any given time, although most remain undetected due to their small size and dimness.

Future Predictions

After its temporary stay, 2024 PT5 is expected to make another close approach to Earth on January 9, 2025, before returning to our vicinity again in 2055. This cyclical nature of mini-moons provides scientists with opportunities to study their characteristics and origins. The current consensus is that 2024 PT5 likely originated from the Arjuna asteroid belt, a region populated by near-Earth objects.

Observational Opportunities

While the asteroid will be too faint for amateur telescopes to detect, professional astronomers equipped with more powerful instruments may be able to observe it during its brief orbit. The event presents an exciting opportunity for researchers to gather data on such transient celestial bodies and further understand their role in our solar system.

In summary, the arrival of 2024 PT5 as a mini-moon is a fascinating reminder of the dynamic interactions between Earth and nearby asteroids, showcasing the planet’s ability to temporarily capture these space rocks and offering insights into their origins and behaviors.

 

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