************************************************************************ IERS Message No. 437 July 13, 2021 ************************************************************************ 2nd Earth Orientation Parameters Prediction Comparison Campaign - CfP Dear Colleagues, We would like to invite you to participate in the Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) in an effort to determine the current state of the art in Earth Orientation Parameters (EOP) predictions. The precise relationship between the celestial (ICRF) and terrestrial reference (ITRF) is needed in many advanced geodetic and astronomical tasks, including precise positioning on Earth, pointing astronomical instruments, and navigation of deep-space satellite missions. For this transformation, the knowledge of EOP is necessary. Some tasks require real-time EOP data or even their future evolution. Within the IERS, operational predictions are provided by the IERS Rapid Service/Prediction Centre (RS/PC) at United States Naval Observatory (USNO). There are also other institutions around the world that process geodetic observations to obtain estimates for the EOPs with short latencies as a basis for the subsequent prediction. However, EOP forecasts delivered by various research centres are not identical due to the use of different input data and methods. The main objective of the 2nd EOP PCC is to compare various methods, models, techniques and strategies that can be applied to the EOP prediction. Each predicted time series will be evaluated by the same statistical methods to indicate the most appropriate and trusted forecasting methodology. What is important, each prediction files have to be submitted before any EOP observations are taken in order to match the conditions under which predictions are made. The 2nd EOP PCC is open to all. Participants are invited to submit prediction results for any of the EOP: the xp, yp pole coordinates, UT1-UTC differences between Earth rotation time and clock time, length of day (LOD), and dX, dY (or dPsi, dEpsilon) celestial pole offsets. Valid predictions of all kinds of EOP will be collected once per week in an operational setting. In contrast to the previous EOP PCC (Kalarus et al. 2010), there is no strictly defined prediction length required except that the maximum prediction horizon is 365 days. The official launch of the 2nd EOP PCC is 1st September 2021, when the first operational predictions are expected. However, the pre-operational phase of the campaign is still in progress. Therefore, participants who register during that phase do not have to re-register. There is no deadline for application to the campaign, new participants can join at any time. If you are interested in participating in the 2nd EOP PCC, you can find more detailed information at: http://eoppcc.cbk.waw.pl/ We would also like to draw your attention to the IERS Working Group on the 2nd Earth Orientation Parameter Prediction Comparison Campaign: https://www.iers.org/WGEOPPCC2 Kind regards, Jolanta Nastula (WG Chair) Henryk Dobslaw (WG Co-Chair) ************************************************************************ IERS Messages are edited and distributed by the IERS Central Bureau. If not stated otherwise, the IERS is only the distributor of the message and is not responsible for its content. To submit texts for distribution, please write to . To subscribe or unsubscribe, please create an IERS account or modify it: https://www.iers.org/Login/Login/EN/login_node.html or write to . Archives: http://www.iers.org/Messages ************************************************************************