Earth has a new cosmic partner — and it’s not a moon, but close. A small asteroid, identified by astronomers in Hawaii, has been traveling through space in perfect tune with our planet’s orbit for around 60 years, remaining so close that, seen from afar, it appears to be tied to Earth’s gravity.
Named 2025 PN7, the celestial body was detected by the Pan-STARRS telescope, at the top of the Haleakalā volcano. The discovery drew attention for its rare behavior: the asteroid revolves around the Sun at the same pace as the Earth, imitating its movements and remaining in a kind of “orbital dance” with the blue planet.
Although it has been dubbed “Earth’s second moon” on social media, 2025 PN7 does not orbit the planet, but the Sun. Its trajectory, however, is so similar to Earth’s that it creates the impression of a natural satellite.
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“It is a so-called ‘quasi-satellite’ — a body that is not gravitationally tied to the Earth, but that shares the same revolution time around the Sun with it,” explains Fernando Roig, researcher at the National Observatory.
According to simulations carried out to date, the object will remain in this synchronized configuration until at least 2083. On its route, it comes within 4 million kilometers of Earth, around ten times the distance from the Moon, before moving away again to almost 18 million kilometers.
Member of the Arjuna family
The new visitor belongs to the Arjuna class of asteroids, small bodies with an almost circular orbit, which cross Earth’s path at regular intervals. 2025 PN7 measures between 20 and 40 meters in diameter, large enough to be detected by modern instruments, but still tiny on planetary scales.
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This type of asteroid is particularly valuable to scientists because it can be monitored for long periods, unlike most near-Earth objects (so-called NEOs) that pass quickly and disappear.
“These temporary companions allow us to observe, year after year, how gravity shapes its paths and influences the stability of the Earth’s orbit,” explains Roig.
Neither moon nor threat
Despite the online repercussion, there is no risk of collision. The asteroid maintains a safe distance and follows a predictable trajectory, stabilized by the gravitational balance between the Sun and Earth.
NASA, which monitors objects close to the planet, has not yet officially commented on the discovery. The agency has had communications suspended since the beginning of October, due to the shutdown of the North American government.
Important discovery
Identifying and tracking bodies like 2025 PN7 helps understand how Earth’s gravity interacts with small space objects and can aid in future asteroid exploration missions.
These studies also expand knowledge about impact risks and the behavior of so-called “orbital resonances”, when two bodies complete their rotations around the Sun in the same time interval.
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“2025 PN7 is a temporary visitor, but it offers us a natural laboratory to study Earth’s gravitational boundaries,” concludes Roig.
At some point, the small asteroid will move away and follow its solar path alone. But until then, it will continue to orbit discreetly alongside Earth, a reminder that, even in space, we don’t travel alone.
