Asteroid 2011 UD21
2011 UD21 is a near-Earth asteroid roughly 8 m across, about the size of a bus. Its closest recorded pass was on 20 May 1978 at 2.5 lunar distances.
Estimated size
8 m
about the size of a bus
Closest pass on record
2.48 LD
20 May 1978
Speed relative to Earth
1.4 km/s
Brightness (H)
28.5
Lower means larger
Past close approaches
Recorded passes within about 20 lunar distances since 1900.