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[i]Bill Gray, who writes the widely used Project Pluto software to track near-Earth objects and was the original source for the Falcon 9 hitting the Moon story, acknowledged the error on his website Saturday. He explained that, back in 2015, he and other observers found an unidentified object in the sky and gave it a temporary name, WE0913A. Further observations suggested it probably was a human-made object, and soon the second stage of the rocket used to launch DSCOVR became a prime candidate. "I thought it was either DSCOVR or some bit of hardware associated with it," Gray wrote Saturday. "Further data confirmed that yes, WE0913A had gone past the moon two days after DSCOVR's launch, and I and others came to accept the identification with the second stage as correct. The object had about the brightness we would expect, and had showed up at the expected time and moving in a reasonable orbit." ... It was an engineer at NASA's Jet Propulsion Laboratory, Jon Giorgini, who realized this object was not in fact the upper stage of a Falcon 9 rocket. He wrote to Gray on Saturday morning explaining that the DSCOVR spacecraft's trajectory did not go particularly close to the Moon, and that it would therefore be a little strange if the second stage strayed close enough to strike it. This prompted Gray to dig back into his data, and identify other potential candidates. He soon found one — the Chinese Chang'e 5-T1 mission launched in October 2014 on a Long March 3C rocket. This lunar mission sent a small spacecraft to the Moon as a precursor test for an eventual lunar sample return mission. The launch time and lunar trajectory are almost an exact match for the orbit of the object that will hit the Moon in March.[/i]
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