https://motherboard.vice.com/en_us/article/d3bzzx/scientist-who-discovered-blunt-shaped-asteroid-says-it-is-almost-definitely-not-aliens

‘Oumuamua, a blunt-shaped asteroid that's also the first object from another star system we've observed in our Solar System, may be a research probe sent from extraterrestrials in another star system, according to a research letter by two researchers from Harvard University's Smithsonian Center for Astrophysics. But the scientists who originally discovered it are already pushing back on these claims.

The research letter was published on arXiv.org on November 1, so keep in mind that the letter has not yet made it through the scientific peer-review process, and there is obviously a huge burden of proof on anyone claiming they’ve identified an alien artifact. According to researchers Shmuel Bialy and Abraham "Avi" Loeb, the asteroid accelerates in a peculiar manner, similar to the acceleration of a comet. But since various researchers have observed that the object has no comet tail or lines from the emission or absorption of gas, an explanation for its strange trajectory, they say, is that it was programmed by an intelligent extraterrestrial civilization.