2I/Borisov, also known as C/2019 Q4, is only the second interstellar object ever known. Discovered by Gennadiy Borisov in 30 August 2019, the comet moved relative to the Sun at 32 km/s and was visible from Earth until July 2020.
Fictional representation of the 2I/Borisov nucleus (its true shape is unknown)
The trajectory of 2I/Borisov as it passes through the inner Solar System. Its position upon discovery on August 2019 is marked in green