Asteroid 2026 RO39 flew past Earth at 0.66 LD on September 14, 2026

Asteroid 2026 RO39 flew past Earth at 07:44 UTC on September 14, 2026, passing about 255 000 km (158 000 miles), or 0.66 LD, from the center of Earth.

NASA/JPL CNEOS close-approach data give an absolute magnitude (H) of 29.338 but no direct diameter range, while the relative velocity at close approach was 10.48 km/s (6.52 mi/s).

NASA/JPL Small-Body Database (SBDB) lists 2026 RO39 as an Apollo-type near-Earth object, with listed orbital elements including an eccentricity of 0.359, a semi-major axis of 1.288 AU, a perihelion distance of 0.825 AU, and an inclination of 3.43°.

The database does not classify 2026 RO39 as potentially hazardous and lists no direct diameter or albedo value for the object.

2026 RO39 was first observed on September 15, 2026, and last observed on September 16, 2026. The orbit solution carries a condition code of 6, meaning the orbit is uncertain or preliminary.

Other recent objects in the 1 LD watchlist included 2026 RB39, which will fly past Earth at 02:30 UTC on September 17 at 1 LD. The same list also included 2026 RT34, 2026 RG15, and 2026 RH10, which flew past Earth at 09:08 UTC on September 13, 07:36 UTC on September 15, and 06:39 UTC on September 10, respectively, at 0.05 LD, 0.25 LD, and 0.65 LD.