Researchers postulate that a peculiar asteroid spotted near Jupiter is a permanent guest from a completely different solar system.

In an article published Monday in the U.K.s Monthly Notices of the Royal Astronomical Society , the researchers say their studies indicate that asteroid 2015 BZ509 (nicknamed BZ) is actually an interstellar immigrant that has been circling the sun ever since our solar system formed about 4.5 billion years ago.

One of the researchers, Fathi Namouni of Frances Cte dAzur Observatory, told HuffPost that would make the discovery the first of its kind.

There is no other asteroid in the solar system that moves around the sun and is known to have been born outside the solar system, he wrote in an email.