************************************************************************ IERS Message No. 194 September 26, 2011 ************************************************************************ Information on the updates to the IERS Conventions The IERS Conventions Center would like to inform its users that the process of updates to the IERS Conventions (2010) has started. The updated electronic version will be found at http://tai.bipm.org/iers/convupdt/ and at http://maia.usno.navy.mil/conv2010/convupdt.html . Changes are recorded with respect to the version of the IERS Conventions (2010) as published at http://www.iers.org/TN36 . The history of past changes between the Conventions (2003) and the Conventions (2010) may be found at http://tai.bipm.org/iers/conv2010/convupdt/ . Chapter 5 "Transformation between the International Terrestrial Reference System and Geocentric Celestial Reference System" has been updated on 13 July 2011, see http://tai.bipm.org/iers/convupdt/convupdt_c5.html . The main changes are the following: * 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_IAU2000A. * 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. Chapter 6 "Geopotential" has been updated on 23 September 2011, see http://tai.bipm.org/iers/convupdt/convupdt_c6.html . In the section 6.3.2 "Ocean tide models", part "FES2004", the phase of the C20 term of the very long period waves has been corrected to pi/2 and the corresponding changes are introduced in the first two data lines of the files fes2004.dat and fes2004_Cnm-Snm.dat. Note that a significant error is also corrected in the file fes2004_Cnm-Snm.dat: The unit of the coefficients is 10^-11 (erroneously was 10^-12). Chapter 7 "Displacement of reference points" has been updated on 23 September 2011, see http://tai.bipm.org/iers/convupdt/convupdt_c7.html . The subroutine ARG2.F has been corrected for a bug that caused an error for dates starting with year 2000. It is expected that the USNO web site http://maia.usno.navy.mil/conv2010/convupdt.html will be updated with a short delay. Gerard Petit and Brian Luzum IERS Conventions Center (This IERS Message was compiled from news notes of the IERS Conventions Center of July 15 and September 23, 2011.) ************************************************************************ 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 and to subscribe or unsubscribe, please write to . Archives: http://www.iers.org/Messages/ ************************************************************************