List of updates to the IERS Conventions (2010)
Working version last updated 10 June 2013

Chapter 0: Introduction.

  • No update

Chapter 1: General definitions and numerical standards.

  • No update

Chapter 2: Conventional celestial reference system and frame.

  • No update

Chapter 3: Conventional dynamical realization of the ICRS.

  • No update

Chapter 4: Terrestrial reference systems and frames.

  • No update

Chapter 5: Transformation between the International Terrestrial Reference System and Geocentric Celestial Reference System.

  • 13 July 2011: Main changes with respect to previous version of the chapter:
    • Correct Tables 5.3a and  5.3b: Column headers misplaced in the "paper" version; One typo in the electronic version.
    • Report an error in the version of Table 5.3b that was published with the Conventions (2003).
    • Correct in Table 5.2f the formula for the polynomial part of Y_IAU 2006 - Y_IAU 2000A.
    • Clarify the text describing the implementation of the IAU 2000A nutation model by the SOFA (Software of Fundamental Astronomy) service.
    • Report the yearly update fcnnut110701 to the Free Core Nutation model.
    • Correct several typos or improper wordings.
  • 14 October 2011: The header of the subroutine PMSDNUT2.F has been corrected to point to the right section of Chapter 5 and to provide a new test case.
  • 10 August 2012: Changes with respect to previous version of the chapter:
    • Report the yearly update fcnnut120701 to the Free Core Nutation model and correct a typo in the value of the FCN period.

Chapter 6: Geopotential.

  • 23 September 2011: Main changes with respect to previous version of the chapter:
    • Correct an error in the file fes2004_Cnm-Snm.dat: The unit of coefficients is 10^-11.
    • The phase of the C20 term of the very long period waves in the FES2004 part of the "Ocean tide models" section has been corrected to pi/2 (from R. Biancale). The corresponding changes are introduced in the first two data lines of the files fes2004.dat and fes2004_Cnm-Snm.dat.
  • 14 October 2011: Main changes with respect to previous version of the chapter:
    • Correct errors in the file fes2004_Cnm-Snm.dat: Coefficients for the waves Sa and P1 were computed with an erroneous phase.
    • In the section 6.3.2 "Ocean tide models", part "FES2004", there is an ongoing discussion on the phase of the C20 term of the very long period waves (pi/2 as per the update of 23 September 2011 or -pi/2). A warning sentence has been inserted in the text. The same warning applies to the values in the first two data lines of the files fes2004.dat and fes2004_Cnm-Snm.dat, which remain as in the update of 23 September 2011.
  • 10 August 2012: Changes with respect to previous version of the chapter:
    • In the section 6.3.2 "Ocean tide models", part "FES2004", it is specified how to treat the zonal terms in order to get consistent values for the Stokes coefficients.

Chapter 7: Displacements of reference points.

  • 23 September 2011: The subroutine ARG2.F has been corrected for a bug that caused an error for dates starting with year 2000 (noted by Sha Liu). Note that the IYEAR argument is now the four-digit year.
  • 14 October 2011: The subroutine ARG2.F has been corrected to not modify internally the IYEAR argument (the four-digit year).
  • 26 March 2012: Have been modified to account for the next leap second to occur June 30, 2012:
    • The program HARDISP.F and its subroutine ETUTC.F
    • The subroutine DEHANTTIDEINEL.F and its subroutines from the SOFA package DAT.F and CAL2JD.F.

      • Note that the previous version of DEHANTTIDEINEL.F, which is the one available on the Conventions 2010 web page, erroneously did not include the update dated April 10, 2009, see the archive of updates. This version reinstalls this update (a 0.05 mm effect).

  • 10 June 2013: The subroutine DEHANTTIDEINEL.F is corrected for a bug that occurred at the update dated 26 March 2012 (noted by D. Ferguson). The potential error is below 0.1 mm.

Chapter 8: Tidal variations in the Earth's rotation.

  • 22 December 2011: The subroutine RG_ZONT2.F has been corrected for a typo in the sine coefficient of the 365.26 day period for delta LOD (noted by J. Lundberg). The effect is of order a ns / day in the length of day.

Chapter 9: Models for atmospheric propagation delays.

  • 25 November 2011: The header of the subroutine GPT.F has been corrected for the test case output (noted by Ian Martin).
  • 26 March 2012: The test case provided for the subroutine VMF1.F has been corrected. The subroutine VMF1_HT.F has been corrected for an error in the computation of the quantity VMF1H (noted by J. McCarthy) and for the test case.
  • 10 August 2012: Changes with respect to previous version of the chapter:
    • In the section 9.2 "Tropospheric model for radio techniques", correct a typo in the Chen and Herring gradient mapping function.
    • In the section 9.4.1 "Ionospheric delay dependence on radio signals including higher order terms", the part "Ray bending effects on geometric path excess and ionospheric delay" has been updated (from E. Petrie and M. Hernandez Pajares).
  • 15 January 2013: Changes with respect to previous version of the chapter:
    • Introduce the model Global Pressure and Temperature 2 in sections 9.2 "Tropospheric model for radio techniques" and 9.3 "Sources for meteorological data" (provided by J. Boehm).
    • In the section 9.4 "Ionospheric models for radio techniques", correct some numerical values in a number of equations for using exact CODATA (2010) values of fundamental constants (noted by R. Langley). Changes are not significant with respect to the uncertainties of the quantities.
  • 10 June 2013: The subroutine GPT2.F has been updated for consistency with the version at TU Wien. This version ensures proper function at the South pole (noted by Changyong He), and the parameter "dmjd" is no longer modified by the subroutine (noted by D. Ferguson). A reference has been completed in the chapter.

Chapter 10: General relativistic models for space-time coordinates and equations of motion.

  • No update

Chapter 11: General relativistic models for propagation.

  • No update

Appendices.

  • 15 January 2013: Addition of Appendix E for the IUGG Resolution 3 Adopted at the XXVth General Assembly (2012).

Glossary.

  • 22 December 2011: In the term "celestial pole offsets," "IAU 2000A" should be replaced by "IAU 2006/2000".
Back to top.