Asteroid 2025 SN4
2025 SN4 is a near-Earth asteroid roughly 29 m across, about the size of a house. Its closest recorded pass was on 21 Sept 1978 at 4.5 lunar distances.
Estimated size
29 m
about the size of a house
Closest pass on record
4.50 LD
21 Sept 1978
Speed relative to Earth
10.8 km/s
Brightness (H)
25.66
Lower means larger
Past close approaches
Recorded passes within about 20 lunar distances since 1900.