Comet 3I/ATLAS is the third detected interstellar visitor, identified by its hyperbolic orbit; backward integration places its origin beyond the solar system. It poses no hazard to Earth, passing no closer than about 1.8 au (~170 million miles, ~270 million km). Perihelion occurs around October 30, 2025 at roughly 1.4 au (~130 million miles, ~210 million km), just inside Mars’s orbit. Its size and physical properties are under active study worldwide. It should remain observable to ground-based telescopes through September 2025, become unobservable while near the Sun, and reappear by early December 2025 for renewed observations.
