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Using data collected at NASA's Infrared Telescope Facility (IRTF) and orbit analysis from the Center for Near-Earth Object Studies (CNEOS) at NASA's Jet Propulsion Laboratory, scientists have confirmed that Near-Earth Object (NEO) 2020 SO is, in fact, a 1960's-Era Centaur rocket booster.

The object, discovered in September by astronomers searching for near-Earth asteroids from the NASA-funded Pan-STARRS1 survey telescope on Maui, garnered interest in the planetary science community due to its size and unusual orbit and was studied by observatories around the world, according to an official release.

Further analysis of 2020 SO's orbit revealed the object had come close to Earth a few times over the decades, with one approach in 1966 bringing it close enough to suggest it may have originated from Earth. Comparing this data with the history of previous NASA missions, Paul Chodas, CNEOS director, concluded 2020 SO could be the Centaur upper stage rocket booster from NASA's ill-fated 1966 Surveyor 2 mission to the Moon.

Equipped with this knowledge, a team led by Vishnu Reddy, an associate professor and planetary scientist at the Lunar and Planetary Laboratory at the University of Arizona, performed follow-up spectroscopy observations of 2020 SO using NASA's IRTF on Maunakea, Hawai'i.

"Due to extreme faintness of this object following CNEOS prediction it was a challenging object to characterise" said Reddy. "We got colour observations with the Large Binocular Telescope, or LBT, that suggested 2020 SO was not an asteroid."

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