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JPL Solar System Dynamics

SSD provides information related to the orbits, physical characteristics, and discovery circumstances for most known natural bodies in our solar system.
Solar System Objects
Count Classification
8 Planets
421 Planetary Satellites (includes satellites of Earth and dwarf planet Pluto)
773,916 numbered
667,875 unnumbered
1,441,791 Asteroids (includes KBOs, TNOs, and dwarf planets)
589 numbered
3,412 unnumbered
4,001 Comets (includes fragments)
Statistics
340,633 orbits computed last month (Feb, 2025)
2,297,812 orbits computed last 12-months