Asteroid 2025 MJ91 flew past Earth at 0.18 LD on June 29, 2025

Asteroid 2025 MJ91, a near-Earth object in the Apollo orbital class, flew past Earth at a minimum distance of 0.18 lunar distances (LD) / 0.00047 AU, which is approximately 70 100 km (43 560 miles) from Earth’s center, at 13:11 UTC on June 29, 2025.

Based on its absolute magnitude (H) of 27.6, the estimated diameter of 2025 MJ91 is between 9 and 21 m (30 to 69 feet), though precise size depends on the object’s albedo.

The asteroid’s relative velocity at close approach was 7.5 km/s.

2025 MJ91 belongs to the Apollo group of asteroids, characterized by Earth-crossing orbits. Its orbit is notably eccentric (e = 0.477) with a semi-major axis of 1.94 AU, a perihelion distance of 1.02 AU, and an inclination of 1.89°. These values indicate a moderately eccentric and slightly inclined path relative to the ecliptic, fitting within typical near-Earth object parameters.

No albedo data is available for 2025 MJ91, so precise surface composition cannot be inferred. It is not classified as a potentially hazardous asteroid (PHA).

2025 MJ91 was first observed on June 30, 2025, and last observed on July 1, 2025, providing a short observation arc. The current orbit solution has a condition code of 7, signifying that the trajectory remains uncertain or preliminary and may be refined with further observations.

Several other near-Earth objects recently passed within 1 lunar distance. Notable examples include Asteroid 2025 MB, which passed at 0.35 LD (56 100 km / 34 860 miles) at 05:46 UTC on June 18, 2025, and Asteroid 2025 LK, which came as close as 0.26 LD (38 600 km / 24 000 miles) at 19:49 UTC on June 8, 2025. These recent flybys were by objects ranging from approximately 5 to 10 m (16 to 33 feet) in estimated diameter, though precise sizes depend on albedo and reflectivity.