Asteroid 2024-YR4 Won’t Hit Earth, But the Moon Could Be in Its Path

A recent asteroid discovery has scientists closely monitoring the skies, with some unexpected findings.

A Close Call with Earth—But Not Quite

On December 2024, a new asteroid named 2024-YR4 was discovered, immediately attracting attention from the global scientific community. Initially, the asteroid seemed to pose a potential threat to Earth. With an estimated size of 40 to 90 meters, the asteroid was assigned a Turin Scale rating of 3, meaning that while the risk was not imminent, the situation required careful observation. It was calculated that the asteroid could potentially impact Earth on December 22, 2032, with a probability of 1.3%.

This news marked a significant moment: the first-ever alert issued by the International Asteroid Warning Network (IAWN), a global initiative aimed at identifying and mitigating asteroid threats. The alarm raised the stakes, but it also led to a significant effort from astronomers to track and study the asteroid more closely.

Global Collaboration to Track the Asteroid

Following the initial scare, a team of researchers from the University of Helsinki, Finland, led the charge in observing the asteroid’s trajectory. Using the Nordic Optical Telescope (NOT) in the Canary Islands, they began a meticulous process of collecting data. The goal was to pinpoint the asteroid’s size, shape, orbit, and rotation to improve predictions.

Over the course of several months, the team worked to refine their understanding of the asteroid’s behavior. However, the full moon in February temporarily obscured the asteroid’s faint signal, delaying further observations. Nevertheless, once the moon’s brightness faded, Finnish astronomers quickly resumed their tracking efforts, leading to a remarkable reduction in the likelihood of an Earth impact to a mere 0.001%.

From Earth Threat to Moon Risk

While the risk of a collision with Earth was essentially ruled out, a surprising new development emerged. Further analysis of the asteroid’s trajectory revealed a 4% chance that it might strike the Moon. If that were to happen, the consequences could still be significant, though different from the devastation of an Earth-bound impact.

Professor Karri Muinonen of the University of Helsinki explains that a collision with the Moon could send debris flying into space, potentially disrupting satellites, space infrastructure, and even crewed missions. While the probability remains low, the potential impact on human activities in space is not insignificant.

Harnessing the Power of Infrared Observation

To gain a better understanding of the asteroid’s exact size, the James Webb Space Telescope was brought into action on March 26, 2025. Its ability to measure infrared radiation proved crucial for estimating the asteroid’s dimensions. The first attempt in early March failed, but subsequent measurements confirmed that the asteroid’s diameter is likely between 46 and 74 meters. This refinement significantly improved the ability to calculate the potential energy of an impact, should it occur.

This level of precision was made possible by the use of advanced observational tools like the NOT telescope, which has proven to be one of the fastest and most reliable instruments for gathering data on near-Earth objects. It is through this kind of scientific innovation and collaboration that researchers are able to stay one step ahead of potential dangers.

Finland’s Strategic Role in Space Monitoring

As the study of asteroids becomes an increasingly critical area of research, Finland is positioning itself as a key player in space risk management. The country’s National Mapping Institute has been responsible for assessing asteroid threats, and soon, this role will be transferred to the newly established National Space Situation Center. This center will not only monitor asteroids but also manage the risks associated with space weather, orbital debris, and satellite operations.

Dr. Anne Virkki, a leading researcher in the field, emphasizes the importance of Finland’s contributions to asteroid monitoring, underscoring the country’s strategic role in global space safety. Finland, along with other nations involved in this work, is helping to pave the way for better preparedness in the face of space-related risks.

A Global Effort to Understand Asteroids

The collaboration between countries like Finland, the U.S., and the U.K. highlights the importance of international cooperation in space science. The insights gained from the study of asteroid 2024-YR4 are valuable not just for understanding this specific object but for advancing global monitoring systems that could one day save lives by detecting and mitigating asteroid threats early.

While the odds of asteroid 2024-YR4 hitting Earth are now practically zero, the possibility of it affecting the Moon reminds us that space is full of unpredictable forces. As we continue to develop more sophisticated tools and foster global collaboration, humanity is better equipped to handle the challenges that lie in the stars above.