2019 OU1

 is a sub-kilometre asteroid, classified as a near-Earth object of the Apollo group. On 28 August 2019, the object safely passed 1.028 million kilometres from Earth, travelling at around 13 km/s.

Observation
was first observed on 25 July 2019 by Pan-STARRS 1 at Haleakala Observatory, Hawaii, United States.

Orbit and classification
is classified as an Apollo asteroid, which means that it is an Earth-crossing asteroid that has an orbital semi-major axis greater than $3.673 au$ but a perihelion distance less than Earth's aphelion distance of $0.575 au$.

Close approach in 2019
On 28 August 2019, safely passed 0.00687 au from Earth, travelling at around 13 km/s.

Physical characteristics
Based on its absolute magnitude of 22.874, is estimated to have a diameter of 71–160 metres using an assumed albedo of 0.05 (carbonaceous) and 0.25 (siliceous) respectively.