"During touchdown, the spacecraft's sampling head sunk 1.6 feet (48.8 centimeters) into the asteroid's surface and simultaneously fired a pressurized charge of nitrogen gas." The thrusters fired to back Osiris-Rex away also disturbed the surface.
The spacecraft edged in to a distance of a mere 2.1 miles (3.5 kilometers) away from the asteroid's surface, marking its closest approach since the sample collection took place.