Discover the Fascinating Details of a Newly Found Quasi-Moon: Earth’s Second Companion in Space

The recent discovery of a new “quasi-moon” has captured scientists’ attention. This celestial object is officially named 2025 PN7 and is characterized as a second companion to Earth. NASA confirmed its findings this week, emphasizing its unique orbit that closely follows our planet.
What is a Quasi-Moon?
A quasi-moon is not a true moon but a small celestial object that travels in tandem with Earth. It orbits the Sun in a path that nearly mirrors Earth’s trajectory.
Discovery and Characteristics of 2025 PN7
2025 PN7 was discovered by a team from the University of Hawaii using the Pan-STARRS observatory located on Haleakala volcano. Initial observations took place on August 29. Archival data indicates it has maintained an Earth-like orbit for several decades.
- Size: Estimated to be between 18 and 36 meters wide, similar in height to a small building.
- Brightness: The object has a magnitude of 26, making it exceptionally dim and difficult to detect with amateur telescopes.
- Distance: At its closest, it approaches Earth within 4 million kilometers, while at its farthest, it can drift up to 17 million kilometers away.
The Scientific Implications
NASA confirmed that there is no known impact risk associated with 2025 PN7. This finding provides scientists with a valuable opportunity to study a small near-Earth object in detail. Current models suggest that it may remain in our vicinity until approximately 2083.
Other Quasi-Satellites of Earth
2025 PN7 joins a select group of other known quasi-satellites, including:
- 164207 Cardea
- 469219 Kamo‘oalewa
- 2006 FV35
- 2013 LX28
- 2014 OL339
- 2023 FW13
Notably, Kamo‘oalewa is believed to be an ancient fragment of the Moon. It is also a target for China’s Tianwen-2 mission, set to launch in May, with plans to retrieve samples in 2027.
Conclusion
The discovery of 2025 PN7 sheds light on the dynamic environment of our solar system. As this quasi-moon coexists with Earth, it presents a unique research opportunity over the coming decades.