"The asteroid was discovered by amateur astronomer Gennadiy Borisov... from his MARGO observatory in Nauchnyi, Crimea, on Saturday, Jan. 21," the laboratory said.
BBC reported that the asteroid, which passed the southern tip of South America, had the closest approach of 3,600km.
Davide Farnocchia, a navigation engineer at JPL said, "In fact, this is one of the closest approaches by a known near-Earth object ever recorded.”