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International Earth Rotation and Reference Systems Service

IERS Working Group on the 2nd Earth Orientation Parameter Prediction Comparison Campaign

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 90 days within its Bulletin A.

Starting in 2021, a second international intercomparison campaign for predicted EOP is being performed under the auspices of the IERS. Valid predictions of all kind of EOP are 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 in Warszaw (Poland). The campaign is expected to run until 2023. New types of prediction methods might enter at any time during the course of the campaign.

Further details can be found in the WG Charter (IERS Working Group on the 2nd Earth Orientation Parameter Prediction Comparison Campaign) (PDF, 106KB, Not barrier-free file.).

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Activities and results of work are described in the following documents.


Jolanta Nastula
Henryk Dobslaw (co-chair)


Robert Heinkelmann (IERS Analysis Coordinator, ex officio)
Daniela Thaller (Director of IERS Central Bureau, ex officio)
Christian Bizouard (Observatoire de Paris)
Mathis Blossfeld (DGFI)
Sigrid Boehm (TU Vienna)
Lue Chen (Beijing Aerospace Control Center)
Robert Dill (GFZ)
Jose Manuel Ferrandiz (University of Alicante)
Richard Gross (JPL)
Maciek Kalarus (University of Berne)
Wieslaw Kosek (Military University of Technology)
Dennis McCarthy (USNO)
Sadegh Modiri (BKG)
Erricos Pavlis (University of Maryland)
David Salstein (AER)
Erik Schoenemann (ESA)
Harald Schuh (GFZ)
Justyna Sliwinska (CBK)
Nick Stamatakos (USNO)
Benedikt Soja (ETH)
Malgorzata Winska (Warsaw University of Technology)
Leonid Zotov (Sternberg Astronomical Institute)


Jolanta Nastula
Space Research Centre
Polish Academy of Sciences
Bartycka 18a
00-716 Warsaw
phone: +48-22-8403766
fax: +48-22-8403131
email: nastula [at] cbk.waw.pl