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A positive leap second WILL be introduced in UTC on 30 June 2012

Decembrer 2011 : Only final C04 values are provided (30 days back) / OPA daily combined solution

July 8 2011 : Questionnaire on future of UTC    Answers

March 11 2011:Japan historical earthquake: first estimates on Earth rotation excitation

Upgraded C04 solution (consistent with ITRF 2008) : ftp://hpiers.obspm.fr/eop-pc/eop/eopc04/

Polar motion over recent year
Atmospheric excitation over the current year

Latest C04 values for polar motion and UT1 on 17 Avril 2012 at 0h UTC:

x= -5.20 mas   y= 344.93 mas   UT1-UTC= -530.878 ms

For the latest 7-20 days and the prediction
IERS recommends the use of Bulletin A provided by the IERS Rapid Service (USNO, Washington)


Prediction campaign  


Missions of the EOP Product Centre of International Earth Rotation Service and Reference Systems :
  • Collect through the world the time series of the Earth Orientation Parameters (EOP):
    • polar motion (x,y)
    • universal time (UT1-UTC, UT1-TAI)
    • Celestial pole offsets (Dpsi, Deps)

    These time series are derived from the various astro-geodetic techniques (LLR, SLR, GPS, VLBI and DORIS).

  • Archive EOP and make them avaible through FTP/WEB
  • Analyse EOP and in particular monitor their consistencies with respect to the international terrestrial and celestial referene frames.
  • Compute a combined standard solution for EOP (Bulletin B) in the (IERS) C04 solution.
  • Compute and make available DUT1 (Bulletin D) and leap second announcements (Bulletin C).

Applications
  • astrometry
  • geophysics
  • space geodesy
  • orbit determination
  • timing
  • positionning

For users interested in the rapid and predicted EOP, refer to Bulletin A provided by the IERS Rapid Service/Prediction Center located at USNO.

Staff

Dr. Daniel Gambis
    Astronomer
    Director of the EOP PC

Dr. Christian Bizouard
     Astronomer
    WEB master, EOP analysis,
    combination algorithm

Olivier Becker
    Technician
    WEB master, C04 solution,
    operational service

Jean-Yves Richard
    Engineer
    Multitechnique Combination
    "GINS Dynamo"

Dr. Sébastien Lambert
    Astronomer
    Numerical analysis

Teddy Carlucci
    Engineer
    Computer manager

Pascale Baudoin
    Secretary
    Administration of EOP-PC


Our graphics or plots are designed thanks to php package JPGRAPH
Contact
Director
Dr. Daniel Gambis
IERS EOP PC
Observatoire de Paris
61, avenue de l'Observatoire
75014 Paris/ FRANCE
Tel
00 33 (0)1 40 51 22 29
Fax
00 33 (0)1 40 51 22 91