NASA’s Webb Telescope Saves the Moon (and Earth!) From Asteroid 2024 YR4
Good news for lunar and terrestrial safety! Recent announcements from ESA and NASA on March 5th confirm that asteroid 2024 YR4 will not impact the Moon. While a 2032 flyby will be ideal for studying how the Moon gravitationally influences similar small bodies, a collision is now ruled out.
The James Webb Space Telescope: A Game Changer
The crucial observations came from the James Webb Space Telescope (JWST). This powerful telescope observed the asteroid in February 2026 in the infrared spectrum, when it was too faint for most ground-based telescopes. Webb’s NIRCam (Near-Infrared Camera) captured images on February 18th and 26th, allowing astronomers to precisely measure its position relative to background stars.
☄️ Asteroid 2024 YR4 will not impact the Moon in 2032!
New observations from the NASA/ESA/CSA James Webb Space Telescope have confirmed that the object will pass safely at a distance of more than 20 000 km.
This result was made possible by a close collaboration between ESA’s… pic.twitter.com/DyQvzchrhd
— European Space Agency (@esa) March 6, 2026
Precise Measurements Lead to Reassurance
These precise measurements allowed scientists to significantly refine calculations of the asteroid’s future trajectory. The result is clear: in 2032, the asteroid will safely pass the Moon. Space.com reports the expected closest approach will be approximately 21,200 kilometers from the lunar surface – a relatively small distance astronomically, but still safe. The asteroid will also miss Earth by a greater distance of 278,000 km.
A “City Killer” Asteroid: What We Know
Asteroid 2024 YR4 was discovered on December 27, 2024, by the ATLAS system in Chile. It’s classified as a near-Earth asteroid, meaning its orbit brings it within 45 million kilometers of Earth’s orbit. Estimated to be roughly 50-70 meters in diameter, it orbits the Sun in just under four years.
While an impact with Earth wouldn’t be a global catastrophe, it could cause significant regional damage. These smaller bodies are sometimes called “city killers” and receive considerable attention. Initially, the asteroid was briefly listed as a risk within planetary defense systems.
The 2028 Flyby: A Valuable Opportunity
Astronomers will have another significant opportunity on December 17, 2028, when the asteroid will make a relatively close approach to Earth, passing within approximately eight million kilometers. This will allow for detailed observations using both ground-based and space-based telescopes, further refining its orbit.
While the 2032 flyby will be closer to both Earth and the Moon, the 2028 pass will be valuable for gathering data. A recent study in The Journal of the Astronautical Sciences suggests the 2028 flyby won’t significantly alter the asteroid’s trajectory.
How Gravitational Interactions Play a Role
Planetary gravity can alter an asteroid’s path during close encounters. However, the 2028 Earth flyby will be distant enough that the change in trajectory will be minimal. The more significant gravitational interaction will occur during the 2032 Earth-Moon system flyby, potentially influencing future encounters.
Foto: NotebookLM, Pavel Vachtl
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A Modern Planetary Defense Success Story
The story of 2024 YR4 demonstrates how modern near-Earth object tracking works. Automated surveys discover new objects, an international network refines their orbits, and powerful telescopes like JWST provide crucial data. This collaborative approach, combined with advanced technology, allows us to assess potential threats and, as in this case, confidently predict safe outcomes.
FAQ: Asteroid 2024 YR4
- Will asteroid 2024 YR4 hit the Earth? No, current calculations present it will safely miss Earth in 2032.
- Will asteroid 2024 YR4 hit the Moon? No, the asteroid will safely pass the Moon in 2032.
- What role did the James Webb Space Telescope play? JWST’s infrared observations were critical in precisely determining the asteroid’s orbit.
- How close will the asteroid get to Earth in 2028? Approximately eight million kilometers.
Pro Tip: Stay informed about near-Earth objects and planetary defense efforts through reputable sources like NASA’s Planetary Defense Coordination Office and ESA’s Space Safety program.
What are your thoughts on the role of advanced telescopes in planetary defense? Share your comments below!
