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History 3I/ATLAS was discovered on 1 July 2025[h] by the NASA-funded ATLAS survey telescope at Río Hurtado, Chile (observatory code W68).[32][33][16] At apparent magnitude 18, the newly discovered object was entering the inner Solar System at a speed of 61 km/s (140,000 mph; 220,000 km/h) relative to the Sun,[22] located 3.50 AU (524 million km; 325 million mi) from Earth and 4.51 AU from the Sun,[30] and was moving in the sky along the border of the constellations Serpens Cauda and Sagittarius, near the galactic plane.[23] It was given the temporary designation 'A11pl3Z' and the discovery observations were submitted to the International Astronomical Union's Minor Planet Center (MPC).[31][33] These observations initially suggested that the object could be on a highly eccentric path that might come close to Earth's orbit, which led the MPC to temporarily list the object on the Near-Earth Object Confirmation Page until the orbit could be confirmed.