Minor planets, primarily comprising asteroids and dwarf planets, represent the primordial remnants of the early solar system. Unlike the eight major planets, these bodies have not cleared their orbital neighborhoods, providing a "frozen" record of the chemical and physical conditions present during the solar system's formation roughly 4.6 billion years ago. This paper examines the classification, distribution, and scientific significance of minor planets, highlighting their role in understanding planetary evolution and the modern methodologies used for their discovery and analysis. 1. Introduction and Classification
: Located between the orbits of Mars and Jupiter, this region contains the highest concentration of rocky asteroids. minor planet
The term "minor planet" is an astronomical classification encompassing all small solar system bodies that are not comets. As of early 2026, over 1.5 million minor planets have been identified. These bodies are distinguished from major planets based on three criteria established by the International Astronomical Union (IAU) : : They must orbit a star (the Sun). As of early 2026, over 1
: Bodies located beyond the orbit of Neptune, including Kuiper Belt objects. includes larger minor planets like Pluto
A sub-category, , includes larger minor planets like Pluto , Ceres, Eris, Haumea, and Makemake, which meet the shape criteria but fail to clear their orbits. 2. Distribution and Populations
Minor planets are found in diverse regions of the solar system, reflecting various evolutionary paths: