The European Space Agency has made a major breakthrough in tracking 3I/ATLAS, the third recorded interstellar object to enter our Solar System. Using highly precise observations from the ExoMars Trace Gas Orbiter around Mars, scientists have now refined the comet’s trajectory with far greater accuracy than Earth-based measurements alone could provide.
This is significant because interstellar objects move extremely fast and do not follow the same gravitational patterns as typical Solar System comets. Their paths can be difficult to predict, especially when they’re first discovered. The new ESA data fills in gaps in the comet’s arc and reduces uncertainty in its orbit, giving astronomers a clearer understanding of where 3I/ATLAS has been, and where it’s going.
Why this matters
3I/ATLAS represents a rare opportunity. Only two other interstellar visitors have ever been confirmed: 1I/‘Oumuamua in 2017 and 2I/Borisov in 2019. The more accurately we can track these objects, the more we can learn about how other star systems form, what kind of material they contain, and how these bodies behave when crossing into our neighbourhood.
The refined trajectory also helps international observatories coordinate follow-up observations. As the comet’s ion tail continues to grow and become more visible, the window for scientific study is opening, but it won’t last long. By the time it leaves our Solar System again, the chance to study it up close will be gone.
A milestone for planetary defence
Although 3I/ATLAS is not a threat to Earth, the achievement has major implications for planetary defence. Being able to track fast, unpredictable interstellar objects from multiple vantage points, including spacecraft around other planets, gives scientists a new tool for early detection and accurate modelling of unusual space visitors.
The ESA notes that this combined approach could become standard practice for future interstellar detections, especially as more solar-system orbiters and deep-space probes become capable of precision observations.
News source full article: ESA
