134687

134687 (2003 XN10) is a stony asteroid residing in the inner region of the main asteroid belt. It was first observed on 1 November 2003 by the Lincoln Near‑Earth Asteroid Research (LINEAR) survey at the Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico. The discovery was announced within the Minor Planet Center's bulletins and the object later received its permanent number after sufficient observations confirmed its orbit.

Orbital characteristics place 134687 in the family of the Eunomia group. Its semi‑major axis measures about 2.34 astronomical units, and it orbits the Sun every 3.58 years (approximately 1,308 Earth days). The eccentricity of the orbit is 0.19, giving the asteroid a perihelion distance of 1.97 AU and an aphelion of 2.71 AU. Its orbital inclination relative to the ecliptic is modest, at 6.5°. These parameters result in a well‑defined orbit that remains stable over the timescales of the solar system.

The asteroid is classified as an S‑type, indicating a silicate‑rich surface composition with moderate albedo. Photometric surveys suggest a diameter of roughly 7.6 kilometers, though the value is sensitive to the assumed albedo. Spectroscopic studies confirm its stony taxonomy. Rotation is relatively slow, with observations indicating a rotational period near 7.8 hours and a light‑curve amplitude of 0.12 magnitude, indicative of a fairly near‑spherical shape.

Because of its well‑detected orbit and physical properties, 134687 serves as a representative member of the inner main belt. Further observations—especially radar imaging and thermal infrared measurements—are expected to refine its size, shape, and surface characteristics, contributing to a broader understanding of the composition and dynamical evolution of Eunomia family asteroids.