"I'm not saying it's an alien technology," Loeb said. "I'm just saying it doesn't look like a very common thing, and actually, the glow that is around this object, usually for comets, you see a trailing tail behind the object and here the glow from the Hubble Space Telescope image is actually in front of the object. We've never seen such a thing. A comet doesn't have glow in front of it."

Perhaps it is traveling backwards in time?

https://www.rawstory.com/3i-atlas-unidentified-craft/