Asteroid 2025 US5 will fly past Earth at 0.61 LD on October 25, 2025

Asteroid 2025 US5 will fly past Earth at a distance of 0.61 lunar distances (LD) / 0.00157 AU (235 540 km / 146 363 miles) from the center of the planet at 11:08 UTC on October 25, 2025.

Based on its absolute magnitude (H = 30.2), 2025 US5 is estimated to be very small, likely within the range of approximately 4–9 m (13–30 feet) in diameter. The asteroid is not expected to pose any risk to Earth during this passage.

The object will pass Earth at a relative velocity of roughly 10.16 km/s at its closest approach.

Asteroid 2025 US5 is classified as an Apollo-type near-Earth object (NEO). Key orbital elements include an eccentricity of 0.385, a semi-major axis of 1.32 AU, a perihelion distance of 0.815 AU, and an inclination of 3.44 degrees. These elements describe a moderately eccentric orbit with a slight tilt relative to the ecliptic plane, typical for small NEOs. The asteroid’s aphelion distance is 1.83 AU, and its orbit takes approximately 556 days to complete.

Physical surface characteristics such as albedo are not yet available. 2025 US5 is not currently classified as a potentially hazardous asteroid, based on its diameter and calculated orbit.

The asteroid was first observed on October 23, 2025, and last observed on October 24, 2025, resulting in a short observation arc of 2 days. Its orbit solution is currently rated with a condition code of 7, indicating the orbital parameters are uncertain or preliminary, and may be refined as more data are collected.

Other near-Earth objects that have recently passed within 1 lunar distance include Asteroid 2025 UJ4, which flew past Earth at 0.16 LD at 21:30 UTC on October 21, 2025, and Asteroid 2025 UM1 at 0.28 LD at 14:57 UTC on October 18, 2025. These events occurred at even closer ranges but involved similarly small objects.