Asteroid 2021 SN1
2021 SN1 is a near-Earth asteroid roughly 243 m across, about the size of a stadium. Its closest recorded pass was on 14 Oct 1978 at 13.3 lunar distances.
Estimated size
243 m
about the size of a stadium
Closest pass on record
13.28 LD
14 Oct 1978
Speed relative to Earth
26.4 km/s
Brightness (H)
21.07
Lower means larger
Past close approaches
Recorded passes within about 20 lunar distances since 1900.