Asteroid 2021 OS
2021 OS is a near-Earth asteroid roughly 155 m across, about the size of a stadium. Its closest recorded pass was on 18 Jul 1940 at 11.1 lunar distances.
Estimated size
155 m
about the size of a stadium
Closest pass on record
11.08 LD
18 Jul 1940
Speed relative to Earth
12.4 km/s
Brightness (H)
22.04
Lower means larger
Past close approaches
Recorded passes within about 20 lunar distances since 1900.