Asteroid 2021 HD
2021 HD is a near-Earth asteroid roughly 22 m across, about the size of a house. Its closest recorded pass was on 20 Apr 1906 at 3.3 lunar distances.
Estimated size
22 m
about the size of a house
Closest pass on record
3.33 LD
20 Apr 1906
Speed relative to Earth
11.8 km/s
Brightness (H)
26.27
Lower means larger
Past close approaches
Recorded passes within about 20 lunar distances since 1900.