(612600) 2003 SM84

is a sub-kilometer asteroid, classified as near-Earth object of the Amor group orbiting between Earth and Mars. It was first observed by the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory ETS on 20 September 2003. As of 2026, this minor planet has not been named.
is an Amor asteroid – a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it. It orbits the Sun at a distance of 1.0–1.2 AU once every 14 months. Its orbit has an eccentricity of 0.08 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with its first observation by LINEAR in 2003.
The object's spectral type remains unknown. Using a magnitude-to-diameter conversion, measures 75 and 140 meters in diameter, based on an absolute magnitude of 23.0 and an assumed albedo of 0.20 and 0.057, respectively. was being considered by the European Space Agency as a candidate target for the Don Quijote mission to study the effects of impacting a spacecraft into an asteroid.