Earth bids farewell to 'mini moon' asteroid set for return visit in 2055

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• Planet Earth is bidding farewell to a "mini moon," a harmless asteroid named 2024 PT5, which has been trailing Earth for two months and will leave on Monday, drawn away by the sun’s stronger gravitational pull.
• First spotted in August, the asteroid began its brief gravitational interaction with Earth in late September.
• After its departure, the asteroid is not expected to return near Earth until 2055.

Planet Earth is parting company with an asteroid that’s been tagging along as a "mini moon" for the past two months.

The harmless space rock will peel away on Monday, overcome by the stronger tug of the sun’s gravity. But it will zip closer for a quick visit in January.

NASA will use a radar antenna to observe the 33-foot asteroid then. That should deepen scientists’ understanding of the object known as 2024 PT5, quite possibly a boulder that was blasted off the moon by an impacting, crater-forming asteroid.

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While not technically a moon — NASA stresses it was never captured by Earth’s gravity and fully in orbit — it’s "an interesting object" worthy of study.

A supermoon with a partial lunar eclipse rises over Lake Michigan in Chicago, on Sept. 17, 2024. Planet Earth is parting company with an asteroid that’s been tagging along as a "mini moon" for the past two months. (AP Photo/Kiichiro Sato, File)

The astrophysicist brothers who identified the asteroid’s "mini moon behavior," Raul and Carlos de la Fuente Marcos of Complutense University of Madrid, have collaborated with telescopes in the Canary Islands for hundreds of observations so far.

Currently more than 2 million miles away, the object is too small and faint to see without a powerful telescope. It will pass as close as 1.1 million miles of Earth in January, maintaining a safe distance before it zooms farther into the solar system while orbiting the sun, not to return until 2055. That’s almost five times farther than the moon.

The NASA logo is displayed at NASA headquarters in Washington, DC, on June 21, 2023. (STEFANI REYNOLDS/AFP via Getty Images)

First spotted in August, the asteroid began its semi jog around Earth in late September, after coming under the grips of Earth’s gravity and following a horseshoe-shaped path. 

By the time it returns next year, it will be moving too fast — more than double its speed from September — to hang around, said Raul de la Fuente Marcos.

The Waning Gibbous moon is seen on June 8, 2023, in New York City. (Michael M. Santiago/Getty Images)

NASA will track the asteroid for more than a week in January using the Goldstone solar system radar antenna in California’s Mojave Desert, part of the Deep Space Network.

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Current data suggest that during its 2055 visit, the sun-circling asteroid will once again make a temporary and partial lap around Earth.