156400

156400 is a numbered minor planet in the asteroid belt that orbits the Sun between the inner and outer main-belt regions. The asteroid was first observed in 2000 by the Lincoln Near-Earth Asteroid Research (LINEAR) survey at the White Sands Missile Range in New Mexico. Its provisional designation was 2000 SA34 before it received its permanent number. The discovery was confirmed by subsequent observations conducted by the Minor Planet Center.

The orbit of 156400 has a semi-major axis of approximately 2.37 astronomical units, an eccentricity of about 0.15, and a period of roughly 3.65 years. Its inclination relative to the ecliptic plane is around 12 degrees, placing it slightly above the midplane of the asteroid belt. The asteroid has an absolute magnitude of 14.2, which, assuming a typical moderate albedo, translates to an estimated diameter of roughly 3 kilometers.

Photometric studies of 156400 indicate a rotation period near five hours and a lightcurve amplitude that suggests a somewhat elongated shape. No spacecraft missions have visited the asteroid, but its orbit and physical characteristics have been catalogued in databases maintained by the Jet Propulsion Laboratory and the Minor Planet Center. The data contribute to a better statistical understanding of the size distribution and dynamical classes within the main belt.