Maintenance of the ICRS
The IAU has charged the IERS with the responsibility of:
- Monitoring the ICRS;
- Maintening the ICRF:
- Maintening the link of optical reference frames to ICRS:
- Monitoring the evolution in time of the instantaneous positions and motions of the equinox and ecliptic;
- Assisting in the collection and distribution of observations of millisecond pulsars.