Hidden Moon Discovery: Earth’s Secret Revealed – DW

Okay, here’s a breakdown of the provided text, ⁣summarizing the key information about the newly discovered “quasiluna” asteroid⁣ 2025 PN7:

What is 2025 PN7?

*⁢ It’s a newly discovered asteroid⁤ that is a “quasiluna” of Earth.
* Quasilunas are⁣ not moons. They aren’t⁢ gravitationally bound to Earth. Instead, they follow their own orbit⁢ around⁤ the ⁢Sun but synchronize with Earth’s orbit for a period of time, appearing ‍ to⁣ orbit us. They are described as a “set of gravitational hands.”
* It belongs to a group of asteroids called⁣ “Arjunas,” which occupy a region near earth’s orbit.

Revelation & Validation:

* It was initially identified at the end⁤ of⁣ August on a minor planet‍ mailing list.
* Professional ⁢observers confirmed its status through orbital modeling and simulations.

Characteristics:

* Size: ‍ Approximately 19 meters (about⁢ 62 feet) in ⁢diameter.
* ⁤ Brightness: Magnitude of 26 (very faint -⁤ requires good telescopes to see).
* Stability: It’s the smallest⁣ and least ⁤stable⁢ quasiluna‍ discovered⁢ so far.
* Duration: It’s⁤ estimated⁣ to remain in its quasi-orbit around Earth for about 60 years before drifting away. Its total time as a quasiluna will be ⁣around 128 years.

How Long Has It‍ Been There?

* Calculations suggest it⁢ has been accompanying Earth for approximately ‍60 ‍years ⁣ undetected.
* ⁢ Its ‍small size, dimness, and unfavorable viewing conditions from Earth⁤ contributed to it going unnoticed.

Other quasilunas:

* There are currently seven other ⁢known quasilunas:
⁤ * 164207 Cardea (2004 GU9)
* 469219 Kamo ⁤”Oalewa (2016⁣ HO3)
* 277810⁤ (2006 FV35)
⁣ ⁢* ⁣ 2013 LX28
⁣ * 2014 OL339
* 2022 YG
⁤ * 2023 FW13
* Kamo “Oalewa ⁣has a much longer quasi-orbital period (around 381 years).

In essence, the article⁣ details the⁢ exciting⁢ discovery of a small asteroid that’s temporarily “dancing” with ⁣Earth in its orbit around the Sun, a phenomenon that’s relatively rare and⁣ difficult to detect.