2018 PD20

 is a small asteroid, classified as a near-Earth object of the Apollo group, approximately 9-20 m in diameter. On 11 August 2018, it was first observed by ATLAS at the Mauna Loa Observatory on Hawaii, when it passed 33500 km from the Earth. This is notable because it came within a tenth of the lunar distance, or 0.10 LD which is closer to Earth than satellites in a geostationary orbit. These have an altitude of 0.11 LD, about 36,000 km, approximately 3 times the width of the Earth.

Orbit and classification
 orbits the Sun at a distance of 0.82–1.66 AU once every 17 months (503 days; semi-major axis of 1.24 AU). Its orbit has an eccentricity of 0.34 and an inclination of 9° with respect to the ecliptic.

The asteroid has an Earth minimum orbital intersection distance of 0.000181761 AU, which translates into 0.078 lunar distances.