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As an effective means to promote progress in the main areas of Astronomy, the scientific work of the IAU is structured through its
9 Divisions,
39 Commissions, and
The IAU also hosts under the auspices of Division F, the Minor Planet Center.
In the past the IAU also had Program Groups (or equivalent).
The list of Divisions adopted in Beijing is as follows:
- Division A Fundamental Astronomy
- Division B Facilities, Technologies and Data Science
- Division C Education, Outreach and Heritage
- Division D High Energy Phenomena and Fundamental Physics
- Division E Sun and Heliosphere
- Division F Planetary Systems and Astrobiology
- Division G Stars and Stellar Physics
- Division H Interstellar Matter and Local Universe
- Division J Galaxies and Cosmology
Regular Commissions
| Commission Name | Parent Division | |
|---|---|---|
| A1 | Astrometry | Division A Fundamental Astronomy |
| A2 | Rotation of the Earth | Division A Fundamental Astronomy |
| A3 | Fundamental Standards | Division A Fundamental Astronomy |
| B1 | Computational Astrophysics | Division B Facilities, Technologies and Data Science |
| B2 | Data and Documentation | Division B Facilities, Technologies and Data Science |
| B3 | Astroinformatics and Astrostatistics | Division B Facilities, Technologies and Data Science |
| B4 | Radio Astronomy | Division B Facilities, Technologies and Data Science |
| B5 | Laboratory Astrophysics | Division B Facilities, Technologies and Data Science |
| B6 | Astronomical Photometry and Polarimetry | Division B Facilities, Technologies and Data Science |
| C1 | Astronomy Education and Development | Division C Education, Outreach and Heritage |
| C2 | Communicating Astronomy with the Public | Division C Education, Outreach and Heritage |
| C3 | History of Astronomy | Division C Education, Outreach and Heritage |
| C4 | World Heritage and Astronomy | Division C Education, Outreach and Heritage |
| C5 | Cultural Astronomy | Division C Education, Outreach and Heritage |
| D1 | Gravitational Wave Astrophysics | Division D High Energy Phenomena and Fundamental Physics |
| E1 | Solar Radiation and Structure | Division E Sun and Heliosphere |
| E2 | Solar Activity | Division E Sun and Heliosphere |
| E3 | Solar Impact Throughout the Heliosphere | Division E Sun and Heliosphere |
| F1 | Meteors, Meteorites and Interplanetary Dust | Division F Planetary Systems and Astrobiology |
| F2 | Exoplanets and the Solar system | Division F Planetary Systems and Astrobiology |
| F3 | Astrobiology | Division F Planetary Systems and Astrobiology |
| F4 | Asteroids, Comets & Transneptunian Objects | Division F Planetary Systems and Astrobiology |
| G1 | Binary and Multiple Star Systems | Division G Stars and Stellar Physics |
| G2 | Massive Stars | Division G Stars and Stellar Physics |
| G3 | Stellar Evolution | Division G Stars and Stellar Physics |
| G4 | Pulsating Stars | Division G Stars and Stellar Physics |
| G5 | Stellar and Planetary Atmospheres | Division G Stars and Stellar Physics |
| H1 | The Local Universe | Division H Interstellar Matter and Local Universe |
| H2 | Astrochemistry | Division H Interstellar Matter and Local Universe |
| J3 | Galaxies at the Epoch of Reionisation | Division J Galaxies and Cosmology |
Inter-Division Commissions
| Commission Name | Primary Division | Parent Division(s) | |
|---|---|---|---|
| A4 | Celestial Mechanics and Dynamical Astronomy | A | A , F |
| B7 | Protection of Existing and Potential Observatory Sites | B | B , C |
| E4 | Impact of Magnetic Activity on Solar and Stellar Environments | E | E , F , G |
| H3 | Planetary Nebulae | H | G , H |
| H4 | Stellar Clusters | H | G , H , J |
| J1 | Galaxy Spectral Energy Distributions | J | D , G , H , J |
| J2 | Intergalactic Medium | J | B , H , J |
Cross-Division Commissions
| Commission Name | Parent Divisions | |
|---|---|---|
| X1 | Supermassive Black Holes, Feedback and Galaxy Evolution | D , J |
| X2 | Solar System Ephemerides | A , F |