"When it comes to the objects floating around in our solar system, scientists have a pretty good handle on what they all are. Aside from planets, dwarf planets, and moons, many smaller bodies — like comets, asteroids, etc. — have been tracked and studied for years, if not decades. Just days ago, something cruised past Earth and was launched out into space thanks to the gravity of the sun, and scientists still can't say with complete certainty what it was."
For further information please refer to the link below.
The article I read made it clear that this object merely transited the solar system. The sun's gravity nearly reversed the object's trajectory, sending it back towards the side of the ecliptic from which it came.