The scientific mission of the International Astronomical Union is carried out through a structured hierarchy of Scientific Bodies, comprising 9 Divisions, 39 Commissions, and 47 Working Groups, as well as the Minor Planet Center which operates under the auspices of Division F. By organizing the Union's scientific activities into these specialized units, the IAU ensures that every branch of the astronomical endeavour — from fundamental physical constants to the furthest reaches of cosmology, education and social sciences — receives dedicated scientific leadership and coordination.
While Divisions provide a broad disciplinary home for every IAU Member, Commissions focus on specific sub-fields, and Working Groups address targeted, time-sensitive tasks. Together, the IAU Scientific Bodies serve as a global forum for professional astronomers to advance research, manage official celestial naming conventions, define standards, promote international cooperation and safeguard the future of astronomical discovery.
💫 Explore the websites below to learn more about the leadership, mandates, and current initiatives of the IAU Scientific Bodies.