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Welcome on the page of 2nd Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC)

Earth orientation parameters (EOP) comprising of nutation offsets, pole coordinates, and dUT1 represent a critically needed link between the terrestrial and the celestial reference frame. Predictions of EOP are important for a number of operational activities including navigation of deep-space satellite missions, the pointing of astronomical instruments, or satellite-based positioning on Earth. Various agencies and institutions worldwide therefore maintain capacities to rapidly process space geodetic observations to obtain estimates for the Earth orientation parameters with short latencies as a basis for the subsequent prediction. Whereas many users require predictions for only a few days into the future, IERS routinely publishes predictions for up to 1 year ahead within its Bulletin A.

Between 2006 and 2008, the first EOP Prediction Comparison Campaign (EOP PCC; Kalarus et al., 2010) provided a very comprehensive assessment of the capabilities of different EOP prediction methods in an operational setting. Since that time, much progress has been made in terms of improved geodetic data processing, reduced VLBI latency, and routine availability of model-based forecasts of effective angular momentum functions for atmosphere, oceans, and the terrestrial hydrosphere.

In light of those developments, a re-assessment of the various EOP prediction capabilities will be pursued in the frame of the 2nd Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC).

Starting in 2021, the 2nd EOP PCC is being performed under the auspices of the IERS. The dedicated IERS Working Group on 2nd EOP PCC has been established.

2nd EOP PCC is open to all. Predictions of each EOP (xP, yP pole coordinates, UT1-UTC universal time, ΔLOD length of day, dX, dY or dψ, dε, precession–nutation residuals) are welcome. New types of prediction methods might enter at any time during the course of the campaign.

Valid predictions of all kind of EOP will be collected once per week in an operational setting. The accuracy and reliability of different prediction methods will be only evaluated later when geodetic observations of those EOP are eventually available.

The office of the campaign will be maintained by the Space Research Centre of the Polish Academy of Sciences (CBK PAN) in Warsaw (Poland). The campaign is expected to run until 2023.