Astronomers have discovered a massive, skyscraper-size asteroid hiding in plain sight near Earth, thanks to a new algorithm designed to hunt the biggest, deadliest space rocks.

The 600-foot-wide (180 meters) asteroid — now officially named 2022 SF289 — is large enough and orbits closely enough to Earth to be considered a potentially hazardous asteroid (PHA) — one of roughly 2,300 similarly classed objects that could cause widespread destruction on Earth should a direct collision occur. (Luckily, there is no risk of collision with this rock at any point in the foreseeable future.)

The asteroid made a close approach to Earth in September 2022, when it flew within about 4.5 million miles (7.2 million kilometers) of our planet, according to NASA. Yet astronomers around the world failed to detect the asteroid in telescope data at any point before, during or after the approach, as the large rock was obscured by Milky Way starlight.

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(Image credit: ATLAS/University of Hawaii Institute for Astronomy/NASA)