NOVEMBER 25, 2024:
CAPE CANAVERAL, Fla. (AP) — 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 (Nov. 25, 2024), 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 (10-meter) 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.
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.
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 (3.5 million kilometers) away, the object is too small and faint to see without a powerful telescope. It will pass as close as 1.1 million miles (1.8 million kilometers) 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.
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.
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.
Current data suggest that during its 2055 visit, the sun-circling asteroid will once again make a temporary and partial lap around Earth.
OCTOBER 12, 2024:
WASHINGTON (AP) — Earth’s moon will soon have some company — a “mini moon.”
The mini moon is actually an asteroid about the size of a school bus at 33 feet (10 meters). When it whizzes by Earth on Sunday, Sept. 29, 2024, it will be temporarily trapped by our planet’s gravity and orbit the globe — but only for about two months.
The space rock — 2024 PT5 — was first spotted in August by astronomers at Complutense University of Madrid using a powerful telescope located in Sutherland, South Africa.
These short-lived mini moons are likely more common than we realize, said Richard Binzel, an astronomer at Massachusetts Institute of Technology. The last known one was detected in 2020.
“This happens with some frequency, but we rarely see them because they’re very small and very hard to detect,” he said. “Only recently has our survey capability reached the point of spotting them routinely.”
This one won’t be visible to the naked eye or through amateur telescopes, he said.
The discovery by Carlos de la Fuente Marcos and Raúl de la Fuente Marcos was published by the American Astronomical Society.
Binzel, who was not involved in the research, said it’s not clear whether the space rock originated as an asteroid or as “a chunk of the moon that got blasted out.”
The mini moon will circle the globe for almost 57 days but won’t complete a full orbit. On Nov. 25, 2024, it will part ways with the Earth and continue its solo trajectory through the cosmos. It’s expected to pass by again in 2055.
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