Earth To Acquire A Second Moon This Month — But It’s Only Temporary

Earth is about to get a second moon, and it is not sticking around for the long haul. This month, a tiny asteroid called 2024 PT5 will temporarily fall into Earth’s gravity like it accidentally took the wrong exit and somehow ended up in the right neighborhood.

The catch is that it has to approach at just the right speed, around 2,200 miles per hour, and within a specific distance. Carlos de la Fuente Marcos and his team flagged this mini-moon setup, and the timing is wild: the whole temporary capture starts next week and lasts about two months, without a full, proper orbit.

And even if you are staring at the sky with your best gear, 2024 PT5 is still too small and dim for most people to catch.

This month, Earth will welcome a second moon in the shape of a small asteroid known as 2024 PT5.

Carlos de la Fuente Marcos, a researcher at Universidad Complutense de Madrid, and his team are among the scientists who have identified this mini-moon event. Marcos explains that for an object like 2024 PT5 to become temporarily bound to Earth, it needs to approach at a slow velocity of around 2,200 miles per hour (3,540 kilometers per hour) and a specific distance.

Under these conditions, the object’s energy relative to Earth can become negative, temporarily causing it to enter Earth’s gravitational pull.

"Under these conditions, the geocentric energy of the object may become negative, and the object may become a temporary moon of Earth. This particular object will undergo this process starting next week and will remain for about two months. It will not follow a full orbit around Earth," said Carlos de la Fuente Marcos.Robert Lea (created with Canva)

That speed requirement, the one Carlos de la Fuente Marcos mentioned, is basically why 2024 PT5 can’t just wander in and hang out.

So far, only two long-term mini-moons have been identified: 2006 RH120 and 2020 CD3. In contrast, several short-term mini-moons have been recorded, including 1991 VG, 2022 NX1, and 2024 PT5. Despite the excitement, most of these events are invisible to the naked eye.

Unfortunately, 2024 PT5 is too small and dim for casual stargazers to observe, even with typical amateur telescopes. Only large, professional-grade telescopes equipped with advanced detectors can capture a view of this temporary visitor.

"The object is too small and dim for typical amateur telescopes and binoculars. However, it is well within the brightness range of typical telescopes used by professional astronomers. A telescope with a diameter of at least 30 inches, along with a CCD or CMOS detector, is needed to observe this object; a 30-inch telescope and a human eye behind it will not be sufficient," Marcos explained.

Concentric rings are set against a black background, with a bright dot at the center representing Earth.

Once its brief stay near Earth is over, 2024 PT5 will continue its journey around the sun, again becoming part of the Arjuna asteroid group. While it won’t stay long, such mini-moon events remind scientists of the ever-changing nature of space and Earth’s gravitational interactions with nearby objects.

Gravitational disturbances, primarily from the sun, will eventually cause the mini-moon’s ejection from Earth’s vicinity, sending it back into space.

Next week is when 2024 PT5 starts getting pulled into Earth’s gravitational “maybe,” after its geocentric energy dips negative.

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The annoying part is that all these short-term mini-moons, like 1991 VG and 2022 NX1, have already shown how invisible the whole thing can be.

Though 2024 PT5 will not be visible to most, astronomers like Marcos and his colleagues plan to study it closely using telescopic observations.

By examining its light patterns and spectra, they aim to learn more about its composition and properties, contributing valuable knowledge to our understanding of minor asteroids that periodically visit Earth’s neighborhood.

Even with a 30-inch telescope, the CCD or CMOS detector matters, because a human eye alone will not be enough to spot 2024 PT5.

The arrival of asteroid 2024 PT5 as a temporary moon serves as a remarkable reminder of the ever-changing dynamics of our cosmic neighborhood. This brief celestial visitor presents an opportunity for public engagement and educational initiatives that could ignite curiosity about our universe. By integrating such astronomical events into school curricula, educators can enhance students' understanding of space science while fostering a sense of wonder about the cosmos.

Engaging young minds with real-world celestial phenomena like 2024 PT5 empowers them to comprehend the broader implications of space exploration. It instills a sense of responsibility regarding our planet's safety and future. This connection between education and the exploration of our universe is essential for cultivating a scientifically literate society capable of navigating the challenges ahead.

Earth gets a moon cameo, but most of us will miss the punchline.

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