393699

393699 is a numbered minor planet located in the inner region of the asteroid belt. It was first observed on 14 August 2008 by the Lincoln Near-Earth Asteroid Research (LINEAR) program at the Socorro, New Mexico, observatory. The discovery observation was recorded with a CCD camera, and subsequent follow‑up imaging secured its orbit. The object was assigned the provisional designation 2008 FB55 before its orbit was refined enough to receive the permanent number 393699.

The asteroid’s orbit is moderately eccentric, with an eccentricity of 0.12, and it orbits the Sun at a mean distance of about 2.3 astronomical units (AU) with a perihelion of roughly 2.0 AU and an aphelion near 2.6 AU. It has an orbital period of 3.7 years and a semi‑major axis of 2.35 AU. Its inclination is modest, around 5°, placing it well within the main belt’s typical inclination range. The node and argument of perihelion indicate a prograde orbit.

Photometric studies conducted by amateur and professional observers indicate a rotation period near 4.2 hours, with a light curve amplitude suggesting an elongated shape or albedo variegation. Estimated diameters, based on an assumed albedo of 0.15, are roughly 3.5–4.0 kilometers. No spectral classification has been published, but visible–near infrared colors suggest a C‑type or S‑type composition, typical of inner‑belt asteroids.

As of the latest Minor Planet Center data, 393699 has not been assigned a proper name. It remains a catalogued, unremarked body within the vast population of main‑belt asteroids, useful for statistical studies of asteroid dynamics and composition.