3i/atlas quando arriva

3I is shorthand for an interstellar object designated 3I/ATLAS, also known as C/2025 N1 (ATLAS). It is the third confirmed object originating from outside the Solar System to pass through our system, following 1I/ʻOumuamua and 2I/Borisov. Current observations suggest it behaves like a comet: it has a dusty coma and appears to be releasing gas and dust as it nears the Sun. The object approached perihelion around late October 2025, with a closest solar distance near 1.4 AU, and its trajectory indicates it is on an unbound, hyperbolic path (not gravitationally bound to the Sun). Some measurements indicate activity driven by solar heating, including detected signatures of water-related species, though the exact nucleus size is uncertain due to the coma’s glare. If you want, I can summarize the latest consensus from astronomers, provide a quick comparison with previous interstellar visitors, or dive into what the observations imply about the object’s origin and composition.