2020 PN1

is a sub-kilometer asteroid, classified as a near-Earth object of the Aten group, that is a temporary horseshoe companion to the Earth. There are dozens of known Earth horseshoe librators, some of which switch periodically between the quasi-satellite and the horseshoe co-orbital states.

Discovery

was discovered on 12 August 2020 by L. Denneau, J. Tonry, A. Heinze, and H. Weiland observing
for the ATLAS-HKO Survey. As of 20 January 2021, it has been observed 41 times with an observation arc of 361 days.

is currently an Aten asteroid. Its semi-major axis is similar to that of Earth, but it has a moderate eccentricity and low orbital inclination. It alternates between being an Aten asteroid and being an Apollo asteroid, although its orbital evolution is not fully stable and it can be considered as a temporary co-orbital companion to the Earth.

With an absolute magnitude of 25.5 mag, it has a diameter in the range of 10–50 meters.

was pre-selected for an exploration by a Chinese mission of planetary defense including an impactor and a separate orbiter planned to launch in 2026. However, in April 2023, the new target is 2019 VL₅.