Astrophysics (Index)About

International Astronomical Union

(association of professional astronomers)

The International Astronomical Union (IAU or UAI) is an association of professional astronomers, which takes initiatives to promote cooperation in astronomical science, among them, standardizing the designations of bodies and standardizing recommended values of measurable quantities, e.g., the radius of the Sun. This assists communication and collaboration among researchers regarding observation data, modeling, etc. Thus, for example, two researchers each modeling the Sun can avoid results incompatible solely because they selected different measures of its radius. The IAU famously redefined the definition of planet such that Pluto was relegated to the status of "dwarf planet".

Also among IAU's activities has been dissemination of alerts (by mail) on recent astronomical phenomena, IAU Circulars (IAUC), first mailed in 1920 and still being mailed through 2016.

Further reading:

Referenced by pages:
celestial coordinate system
dwarf planet
galactic coordinate system (GCS)
galactic north
International Celestial Reference System (ICRS)
Minor Planet Center (MPC)
rare designator prefixes
supernova designator
time standard
terrestrial time (TT)