The collaborative mission will test a technique that could be used to prevent a dangerous space rock from colliding with the Earth in future.
International asteroid warning network to be put to the test by 50ft-wide asteroid.
NASA is using the opportunity to test out its planetary defense systems.
Paul Chodas from NASA's CNEOS says the exercise will be the same as if the asteroid were on course to hit Earth.
A house-sized asteroid will pass by Earth at a distance of as little as 4,200 miles in October.