This is 79th known asteroid to fly past Earth since the start of the year and the 6th so far this month.
2025 OS was first observed by ATLAS Chile, Rio Hurtado at 07:26 UTC — about 4 hours after it made its close approach.
The object belongs to the Apollo group of asteroids and has an estimated diameter between 2.7 and 6 m (9–20 feet).
2025 OS is not classified as potentially hazardous due to its small estimated size.
References:
1 Asteroid 2025 OS – CNEOS – July 19, 2025
2 Asteroid 2025 OS – MPC – July 19, 2025