Earth's recent ‘mini-moon' may be an actual piece of the moon, astronomers say
The celestial near-Earth object, known as 2024 PT5, measures about 33 feet (10 meters) wide; however, it's not in any danger of colliding with Earth now or over the next few decades due to its trajectory, according to researchers. After its close approach to the Earth, 2024 PT5 is slowly receding away in its new, more distant orbit.
But surprisingly, the object's orbit around the sun is similar to Earth's, suggesting that 2024 PT5 originated from our corner of the solar system.
Astronomers first spotted the asteroid on August 7 using the South Africa-based observatory of the NASA-funded Asteroid Terrestrial-impact Last Alert System, or ATLAS.
Despite predictions that the asteroid might become a temporary mini-moon whirling around Earth, the space rock maintained a horseshoe orbit that brought it close, but it never actually entered into an orbit around our planet. However, this almost-mini-moon is still special as it is potentially a piece of the real moon, said Dr. Teddy Kareta, a postdoctoral associate at Lowell Observatory in Arizona.
Kareta is the lead author of a study about the object that was published January 14 in the Astrophysical Journal Letters.
'It was never really in orbit, but the vocabulary here to describe what it did do — approach the Earth from the inside, have its orbit slightly altered by a very close approach with the Earth-Moon system, and then recede away from us on the 'outside' in an overall horseshoe trajectory — hardly caters to fun nicknames,' Kareta said in an email. 'It was nearly orbiting us for about two months. This kind of orbit is fundamentally rare, so it shouldn't be too surprising that we don't have a generic term for it yet.'
Kareta and his colleagues observed the object with the Lowell Discovery Telescope and the NASA Infrared Telescope Facility at the Mauna Kea Observatory in Hawaii. As sunlight reflected off 2024 PT5's surface, the team realized it looked very similar to rocks retrieved from the lunar surface.
'We had a general idea that this asteroid may have come from the Moon, but the smoking gun was when we found out that it was rich in silicate minerals — not the kind that are seen on asteroids but those that have been found in lunar rock samples,' Kareta said. 'It looks like it hasn't been in space for very long, maybe just a few thousand years or so.'
The discovery sheds light on a rare but growing population of lunar asteroids, which could reveal just how many times impacts on the moon have sent wayward space rocks flying into the vicinity of Earth.
Ruling out space debris
Kareta and members of his team at Lowell Observatory, who study near-Earth asteroids on close orbits, were already observing the object before anyone dubbed it a potential mini-moon.
To ensure that 2024 PT5 wasn't a hunk of space debris, like an old rocket, which can also be found in an Earthlike orbit, the team studied how the object moved.
Space rocks and manufactured items respond differently to solar radiation pressure, or the momentum of particles of light from the sun. These quantum particles, called photons, exert a tiny bit of force when they encounter objects in space. When many photons hit an object, they can speed it up or slow it down.
When photons impact a hollow rocket booster, it moves like an empty tin can getting hit with a wind gust, while an asteroid's motion won't be very noticeably affected, according to NASA.
Scientists from NASA's Center for Near Earth Object Studies (CNEOS), which tracks asteroids and space debris, calculated the motion of 2024 PT5 and determined it was truly a space rock, rather than debris.
'Space debris and space rocks move slightly differently in space,' said study coauthor Oscar Fuentes-Muñoz, a postdoctoral fellow at NASA's Jet Propulsion Laboratory who worked with CNEOS researchers, in a statement. 'Human-made debris is usually relatively light and gets pushed around by the pressure of sunlight. That 2024 PT5 doesn't move this way indicates it is much denser than space debris.'
Robert Jedicke, a specialist emeritus on solar system bodies at the University of Hawaii's Institute for Astronomy, believes the argument that 2024 PT5 is of lunar origin is convincing because the study authors 'have performed an exhaustive analysis of all reasonable options.' Jedicke was not involved in the new study.
'The hypothesis that minimoons, or objects like 2024 PT5 on heliocentric orbits similar to Earth's, could be chips off the moon is perfectly reasonable,' Jedicke said in an email. 'It is expected that some objects launched off the moon by an asteroid or comet impact would evolve into these kinds of orbits.'
Multiple studies about the object have been published since its discovery in August, and a September paper by Carlos de la Fuente Marcos, a researcher on the faculty of mathematical sciences at the Complutense University of Madrid, was one of the first. He said that most research has arrived at a similar conclusion about 2024 PT5 being lunar debris. De la Fuente Marcos was not involved in the new study.
'Right after discovery, CNEOS' director Paul Chodas stated that the dynamics of 2024 PT5 could only be explained if it was a fragment of the moon released during an impact event. His words have been prophetic,' de la Fuente Marcos said.
De la Fuente Marcos' paper in September suggested that the object is part of the Arjuna asteroid belt, which is made of small asteroids that have orbits around the sun similar to Earth's orbit. The possibility that this belt is made of lunar debris is 'indeed an unexpected discovery,' de la Fuente Marcos said.
Classifying lunar asteroids
Given the lack of weathering on the asteroid, it can only be a maximum of about a few million years old, Kareta said, but it's likely much younger. The reflectivity of the asteroid's surface best matches material from the Lunar Highlands, or the bright, rough terrain on most of the moon's surface, he said.
If scientists can link lunar asteroids to specific craters on the moon, the space rocks could reveal more about material on the lunar surface, as well as below it.
So far, 2024 PT5 is just the second object in an Earth-like orbit of purported lunar origin. Astronomers found asteroid 469219 Kamo'oalewa in 2016, which was also likely ejected from the lunar surface after something slammed into the moon.
The discovery of Kamo'oalewa excited asteroid scientists who were eager to find more, but no other candidates have emerged until 2024 PT5.
'If there's one of something, it's easy to convince yourself that it's an outlier or hard to explain,' Kareta said. 'If there are two, then there's a whole population out there waiting to be recognized and studied.'
Kareta and his colleagues estimate that as many as 16 asteroids of lunar origin have already been found and await confirmation.
'The total size and properties of the population are directly related to how often the moon produces these little wayward rocks — that's the kind of information we want to go after as this population grows,' Kareta said.
More sensitive telescopes coming online in the future, like the Vera Rubin Observatory on Earth (in Chile) and the NEO Surveyor in space, will be able to detect more asteroids in general, including small, faint rocks ejected by the moon.
'We're also going to have to get savvier about how we can whittle down the dozens or hundreds of candidate objects with interestingly lunar-like orbits before we go out to the telescope,' Kareta said. 'It's like looking for a needle in a haystack, except the needles don't look too different from the hay until you get them in front of a telescope.'
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The asteroid that will spare Earth might hit the moon instead. What happens if it does?
The asteroid known as 2024 YR4 is out of sight yet still very much on scientists' minds. The building-sized object, which initially appeared to be on a potential collision course with Earth, is currently zooming beyond the reach of telescopes on its orbit around the sun. But as scientists wait for it to reappear, its revised trajectory is now drawing attention to another possible target: the moon. Discovered at the end of 2024, the space rock looked at first as if it might hit our planet by December 22, 2032. The chance of that impact changed with every new observation, peaking at 3.1% in February — odds that made it the riskiest asteroid ever observed. Ground- and space-based telescope observations were crucial in helping astronomers narrow in on 2024 YR4's size and orbit. With more precise measurements, researchers were ultimately able to rule out an Earth impact. The latest observations of the asteroid in early June, before YR4 disappeared from view, have improved astronomers' knowledge of where it will be in seven years by almost 20%, according to NASA. That data shows that even with Earth avoiding direct impact, YR4 could still pose a threat in late 2032 by slamming into the moon. The impact would be a once-in-a-lifetime event for humanity to witness — but it could also send fine-grained lunar material hurtling toward our planet. While Earth wouldn't face any significant physical danger should the asteroid strike the moon, there is a chance that any astronauts or infrastructure on the lunar surface at that time could be at risk — as could satellites orbiting our planet that we depend on to keep vital aspects of life, including navigation and communications, running smoothly. Any missions in low-Earth orbit could also be in the pathway of the debris, though the International Space Station is scheduled to be deorbited before any potential impact. Initially, YR4 was seen as a case study in why scientists do the crucial work of planetary defense, discovering and tracking asteroids to determine which ones have a chance of colliding with Earth. Now, astronomers say this one asteroid could redefine the range of risks the field addresses, expanding the purview of the work to include monitoring asteroids that might be headed for the moon as well. 'We're starting to realize that maybe we need to extend that shield a little bit further,' said Dr. Paul Wiegert, a professor of astronomy and physics at the Western University in London, Ontario. 'We now have things worth protecting that are a bit further away from Earth, so our vision is hopefully expanding a little bit to encompass that.' In the meantime, researchers are assessing just how much chaos a potential YR4 lunar impact could create — and whether anything can be done to mitigate it. 'City killer' on the moon The threatening hunk of rock appears as just a speck of light through even the strongest astronomical tools. In reality, YR4 is likely about 60 meters (about 200 feet) in diameter, according to observations in March by the James Webb Space Telescope, the most powerful space-based observatory in operation. 'Size equals energy,' said Julien de Wit, associate professor of planetary sciences at the Massachusetts Institute of Technology, who observed YR4 with Webb. 'Knowing YR4's size helped us understand how big of an explosion it could be.' Astronomers believe they have found most of the near-Earth asteroids the field would classify as 'planet killers' — space rocks that are 1 kilometer (0.6 mile) across or larger and could be civilization-ending, said Dr. Andy Rivkin, planetary astronomer from the Johns Hopkins University's Applied Physics Laboratory in Maryland. The planet killer that slammed into Earth 66 million years ago and led to the extinction of dinosaurs was estimated to be roughly 6 miles (about 10 kilometers) in diameter. Smaller asteroids such as YR4, which was colloquially dubbed a 'city killer' after its discovery, could cause regional devastation if they collide with our planet. About 40% of near-Earth space rocks larger than 140 meters (460 feet) but smaller than a kilometer — capable of more widespread destruction — have been identified, according to NASA. But astronomers have never really had a chance to watch a collision of that size occur on the moon in real time, Wiegert said. The latest glimpses of YR4 on June 3 before it passed out of view revealed a 4.3% chance of a YR4 lunar impact — small but decent enough odds for scientists to consider how such a scenario might play out. A striking meteor shower — and a risk Initial calculations suggest the impact has the largest chance of occurring on the near side of the moon — the side we can see from Earth. 'YR4 is so faint and small we were able to measure its position with JWST longer than we were able to do it from the ground,' said Rivkin, who has been leading the Webb study of YR4. 'And that lets us calculate a much more precise orbit for it, so we now have a much better idea of where it will be and won't be.' The collision could create a bright flash that would be visible with the naked eye for several seconds, according to Wiegert, lead author of a recent paper submitted to the American Astronomical Society journals analyzing the potential lunar impact. The collision could create an impact crater on the moon estimated at 1 kilometer wide (0.6 miles wide), Wiegert said — about the size of Meteor Crater in Arizona, Rivkin added. It would be the largest impact on the moon in 5,000 years and could release up to 100 million kilograms (220 million pounds) of lunar rocks and dust, according to the modeling in Wiegert's study. Even pieces of debris that are just tens of centimeters in size could present a hazard for any astronauts who may be present on the moon, or any structures they have built for research and habitation, Wiegert said. The moon has no atmosphere, so the debris from the event could be widespread on the lunar surface, he added. On average, the moon is 238,855 miles (384,400 kilometers) away from Earth, according to NASA. Particles the size of large sand grains, ranging from 0.1 to 10 millimeters in size, of lunar material could reach Earth between a few days and a few months after the asteroid strike because they'll be traveling incredibly fast, creating an intense, eye-catching meteor shower, Wiegert said. 'There's absolutely no danger to anyone on the surface,' Wiegert said. 'We're not expecting large boulders or anything larger than maybe a sugar cube, and our atmosphere will protect us very nicely from that. But they're traveling faster than a speeding bullet, so if they were to hit a satellite, that could cause some damage.' Not all lunar debris that reaches the Earth is so small, and it depends on the angle and type of impact to the moon, according to Washington University in St. Louis. Space rocks slamming into the lunar surface over millions of years have resulted in various sizes of lunar meteorites found on Earth. Preparing for impact Hundreds to thousands of impacts from millimeter-size debris could affect Earth's satellite fleet, meaning satellites could experience up to 10 years' equivalent of meteor debris exposure in a few days, Wiegert said. Humankind depends on vital space infrastructure, said Dan Oltrogge, chief scientist at COMSPOC, a space situational awareness software company that develops solutions for handling hazards such as space debris. 'Space touches almost every aspect of our lives today, ranging from commerce, communications, travel, industry, education, and social media, so a loss of access to and effective use of space presents a serious risk to humanity,' Oltrogge said. The event is unlikely to trigger a Kessler Syndrome scenario in which debris from broken satellites would collide with others to create a domino effect or fall to Earth. Instead, it might be more akin to when a piece of gravel strikes a car windshield at high speed, meaning solar panels or other delicate satellite parts might be damaged, but the satellite will remain in one piece, Wiegert said. While a temporary loss of communication and navigation from satellites would create widespread difficulties on Earth, Wiegert said he believes the potential impact is something for satellite operators, rather than the public, to worry about. Protecting Earth and the moon Scientists and astronomers around the world are thinking about the possible scenarios since they could not rule out a lunar impact before YR4 disappeared from view, Wiegert said. 'We realize that an impact to the moon could be consequential, so what would we do?' de Wit said. A potential planetary defense plan might be clearer if the asteroid were headed straight for Earth. Rivkin helped test one approach in September 2022 as the principal investigator of NASA's Double Asteroid Redirection Test, or DART, which intentionally slammed a spacecraft into the asteroid Dimorphos in September 2022. Dimorphos is a moonlet asteroid that orbits a larger parent asteroid known as Didymos. Neither poses a threat to Earth, but the double-asteroid system was a perfect target to test deflection technology because Dimorphos' size is comparable to asteroids that could harm our planet in the event of an impact. The DART mission crashed a spacecraft into the asteroid at 13,645 miles per hour (6 kilometers per second) to find out whether such a kinetic impact would be enough to change the motion of a celestial object in space. It worked. Since the day of the collision, data from ground-based telescopes has revealed that the DART spacecraft did alter Dimorphos' orbital period — or how long it takes to make a single revolution around Didymos — by about 32 or 33 minutes. And scientists have continued to observe additional changes to the pair, including how the direct hit likely deformed Dimorphos due to the asteroid's composition. Similarly, if YR4 strikes the moon and doesn't result in damaging effects for satellites, it could create a tremendous opportunity for researchers to learn how the lunar surface responds to impacts, Wiegert said. But whether it would make sense to send a DART-like mission to knock YR4 off a collision course with the moon remains to be seen. It will depend on future risk assessments by planetary defense groups when the asteroid comes back into view around 2028, de Wit said. Though defense plans for a potential moon impact still aren't clear, YR4's journey underscores the importance — and the challenges — of tracking objects that are often impossible to see. Hidden threats YR4 was detected by the Asteroid Terrestrial-impact Last Alert System, or ATLAS telescope, in Río Hurtado, Chile, two days after the asteroid had already made its closest pass by Earth, hidden by the bright glare of the sun as it approached our planet. The same thing occurred when an asteroid measuring roughly 20 meters (about 65 feet) across hit the atmosphere and exploded above Chelyabinsk, Russia, on February 15, 2013, damaging thousands of buildings, according to the European Space Agency. While no one died, about 1,500 people were injured when the windows in homes and businesses blew out due to the shock wave. Trying to observe asteroids is challenging for many reasons, Rivkin said. Asteroids are incredibly faint and hard to see because rather than emitting their own light, they only reflect sunlight. And because of their relatively tiny size, interpreting observations is not a clear-cut process like looking through a telescope at a planet such as Mars or Jupiter. 'For asteroids, we only see them as a point of light, and so by measuring how bright they are and measuring their temperature, basically we can get a size based on how big do they have to be in order to be this bright,' Rivkin said. For decades, astronomers have had to search for faint asteroids by night, which means missing any that may be on a path coming from the direction of the sun — creating the world's biggest blind spot for ground-based telescopes that can't block out our star's luminosity. But upcoming telescopes — including NASA's NEO Surveyor expected to launch by the end of 2027 and the European Space Agency's Near-Earth Object Mission in the InfraRed, or NEOMIR satellite, set for liftoff in the early 2030s — could shrink that blind spot, helping researchers detect asteroids much closer to the sun. 'NEOMIR would have detected asteroid 2024 YR4 about a month earlier than ground-based telescopes did,' said Richard Moissl, head of ESA's Planetary Defence Office, in a statement. 'This would have given astronomers more time to study the asteroid's trajectory and allowed them to much sooner rule out any chance of Earth impact in 2032.' NASA and other space agencies are constantly on the lookout for potentially hazardous asteroids, defined as such based on their distance from Earth and ability to cause significant damage should an impact occur. Asteroids that can't get any closer to our planet than one-twentieth of Earth's distance from the sun are not considered to be potentially hazardous asteroids, according to NASA. When the new Vera C. Rubin Observatory, located in the Andes in Chile, released its first stunning images of the cosmos in June, researchers revealed the discovery of more than 2,100 previously unknown asteroids after seven nights of those newly detected space rocks, seven were near-Earth objects. A near-Earth object is an asteroid or comet on an orbit that brings it within 120 million miles (about 190 million kilometers) of the sun, which means it has the potential to pass near Earth, according to NASA. None of the new ones detected by Rubin were determined to pose a threat to our planet. Rubin will act as a great asteroid hunter, de Wit said, while telescopes such as Webb could be a tracker that follow up on Rubin's discoveries. A proposal by Rivkin and de Wit to use Webb to observe YR4 in the spring of 2026 has just been approved. Webb is the only telescope with a chance of glimpsing the asteroid before 2028. 'This newly approved program will buy decision makers two extra years to prepare — though most likely to relax, as there is an 80% chance of ruling out impact — while providing key experience-based lessons for handling future potential impactors to be discovered by Vera Rubin,' de Wit said. And because of the twists and turns of YR4's tale thus far, asteroids that have potential to affect the moon could become objects of even more intense study in the future. 'If this really is a thing that we only have to worry about every 5,000 years or something, then maybe that's less pressing,' Rivkin said. 'But even just asking what would we do if we did see something that was going to hit the moon is at least something that we can now start thinking about.' Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more.
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Scientists may have solved a chemistry mystery about Jupiter's ocean moon Europa
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