117645

117645 is a minor planet, specifically a main‑belt asteroid discovered on 18 March 2005 by the Lincoln Near‑Earth Asteroid Research (LINEAR) program at the Lincoln Laboratory’s Experimental Test Site near Socorro, New Mexico. It received the provisional designation 2005 EF9 and was later assigned the sequential number 117645 by the Minor Planet Center. As of the latest data, the asteroid remains unnamed.

The object orbits the Sun at a distance that ranges between 2.43 and 3.13 astronomical units (AU), with a semi‑major axis of approximately 2.78 AU. Its orbital eccentricity is 0.13 and the orbit is inclined about 5.2° to the ecliptic plane. The asteroid completes one revolution around the Sun every 4.64 years (≈1,694 days). Observations indicate a relatively stable, low‑inclination orbit typical of the central region of the asteroid belt.

Photometric measurements give an absolute magnitude (H) of 16.3, which, assuming a generic albedo of 0.15, suggests a diameter of roughly 2 kilometres. No rotational lightcurve has been published, so the rotation period, pole orientation, and detailed shape remain unknown.

Because 117645 lacks a permanent name, it is most often referenced by its number or provisional designation in scientific literature and databases. The asteroid’s orbit is well determined, with an observation arc extending over many oppositions, allowing for accurate long‑term predictions of its position.