20403

20403 is a minor planet discovered by astronomer G. Neukum on September 20, 1997, at the Palomar Observatory. It belongs to the main asteroid belt, a region of space located between the orbits of Mars and Jupiter. Its orbital period is approximately 3.6 years, and it has a semi-major axis of about 2.3 AU. The asteroid's diameter is estimated to be around 5 kilometers. Like most asteroids in the main belt, 20403 is thought to be composed primarily of rock and metal. Its discovery contributes to the ongoing cataloging and study of the solar system's composition and evolution. Further observations and analysis are necessary to determine its precise physical characteristics, such as its albedo, rotation period, and spectral type. The numbering system for minor planets, managed by the Minor Planet Center, assigns unique sequential integers to newly discovered and sufficiently observed celestial bodies.