Earth's New "Mini-Moon": 4 Things To Know

news image
Top Stories
23 Sep 2024 8:30 AM

Earth is about to get a new asteroid friend, but not the kind that crashes and causes havoc. It’s more of an “in-laws that overstay their welcome” kind of situation. Here’s what you need to know about a new mini-moon: 

What’s happening? 

Back in August, the Asteroid Terrestrial-impact Last Alert System (ATLAS) program discovered a roughly 10-meter-wide asteroid from the Arjuna asteroid belt that will get close enough to Earth to classify it as a “mini-moon” starting on September 29th. The report published in the American Astronomical Society journal, said asteroid 2024 PT5 will make a horseshoe shaped orbit around our planet over the course of 57 days; ending on November 25th. 

 

What is a “Mini-Moon"? 

“Mini-moons” can range from asteroids to random pieces of space junk floating around. These near-Earth objects will enter Earth’s gravitational pull and will often complete at least a partial revolution around our planet. Sometimes the object doesn’t even complete a full revolution before exiting and continuing its regular heliocentric trajectories.  While asteroid 2024 PT5 won’t complete a full orbit of Earth, some astronomers may call it a “temporarily captured flyby”. 

Will I be able to see it? 

Short answer: no. 

Long answer: 2024 PT5 won’t be bright enough, even with a typical home telescope.  

NASA classifies how bright celestial objects are by their magnitude. Low numbers, including negatives, are brighter, while higher numbers are fainter. 

2024 PT5 has a magnitude of 27.595. The naked eye can see objects as faint as roughly 6.5 magnitude, and a traditional 12-inch telescope can see things with magnitudes between 16-17. To put it in perspective, the moon sits at –13 magnitude.  

Is this a rare event? 

These phenomena aren’t partially rare as the Earth can capture Near Earth Objects all the time. In 2022, a mini-moon called Asteroid 2022 YG entered the Earth’s orbit. Our planet has had a repeated visitor of 2022 NX1 asteroid who became a mini-moon in both 1981 and 2022. That asteroid won’t be back until 2051 though.  

In fact, this happens so often, some researchers believe Earth always has at least one mini-moon hovering in space.  

 

All Weather News
More
Rare Winter Storm Threatens Over 190 Million

Rare Winter Storm Threatens Over 190 Million

A rare winter storm is impacting parts of the

24 Jan 2026 7:35 PM
Rain and Snow Return to the Southwest

Rain and Snow Return to the Southwest

For much of this winter season, the Southwest

24 Jan 2026 7:15 PM
Severe Thunderstorms Possible Across the South on Sunday

Severe Thunderstorms Possible Across the South on Sunday

While much of the country will be impacted by

24 Jan 2026 7:15 PM
Dangerously Cold Temps Spill Into the Lower 48 Late This Week

Dangerously Cold Temps Spill Into the Lower 48 Late This Week

It's here! The coldest air of the season and

24 Jan 2026 3:00 PM
Snow Continues for the Great Lakes, Northeast

Snow Continues for the Great Lakes, Northeast

A high pressure center has moved in across th

23 Jan 2026 11:15 AM
Cold Stuns Iguanas as Another Cold Snap Reaches South Florida

Cold Stuns Iguanas as Another Cold Snap Reaches South Florida

Sub-freezing temperatures made their way into

20 Jan 2026 10:30 AM
Dangerous Cold follows Weekend Blizzard Conditions in the Northern Plains

Dangerous Cold follows Weekend Blizzard Conditions in the Northern Plains

MONDAY AM UPDATE: WEEKEND SNOW TOTALS: MERCER

19 Jan 2026 11:00 AM