Installing the IAU authority
The IAU authority is an official extension. Download the extension here - http://sourceforge.net/projects/geoserver/files/GeoServer/2.24.2/extensions/geoserver-2.24.2-iau-plugin.zip
Download the extension for your version of GeoServer.
Warning
Make sure to match the version of the extension to the version of GeoServer.
Extract the archive and copy the contents into the GeoServer
WEB-INF/lib
directory.Restart GeoServer.
Verify Installation
To verify that the extension was installed successfully:
On the left menu, get into Demos and then SRS List
Go into the table filter text field, and type IAU, then press enter
A number of IAU codes should appear in the table
