*************************************************************************** IERS Message No. 38 January 7, 2003 *************************************************************************** IAU 2000 Resolution Compliancy Information Resolutions passed at the 24th General Assembly of the International Astronomical Union recommend the implementation of new procedures concerning the transformation between the celestial and terrestrial reference systems. Information regarding these procedures is available in Chapter 5 of the IERS Conventions 2000 at http://maia.usno.navy.mil/conv2000.html. To comply with these resolutions, beginning on 1 January 2003, IERS Bulletin A, Bulletin B, and IERS C04 are providing new products in addition to those already published. These products include the celestial pole offsets: dX = X_obs - X_IAU2000A and dY = Y_obs - Y_IAU2000A, where X_obs, Y_obs are the observed X, Y coordinates of the Celestial Intermediate Pole in the Geocentric Celestial Reference System, and X_IAU2000A, Y_IAU2000A are the celestial pole coordinates provided by using the IAU2000A Precession-Nutation theory. It is expected that Celestial Pole offsets related to the IAU1980 Nutation Theory will continue to be published through 31 December 2004. In IERS Bulletin A sections providing dX and dY will be appended to the current sections. The IERS Rapid Service/Prediction Product Center is providing separate archival files containing these data in the same format as the current files. These are available in ftp://maia.usno.navy.mil/ser7/ BULLETIN B, giving EOPs with a two month delay, will be duplicated from March 2003 onwards to give dX and dY in the new formulation in addition to the current issue containing (dpsi,deps)_1980. The Earth Orientation Product Center is providing new files containing dX and dY listed in the same format than the current files and labeled eopc04_IAU2000.02, eopc04_IAU2000.03,... The new files are available at the following Web/ftp sites: - Web: http://hpiers.obspm.fr/eoppc/eop/eopc04/eopc04_IAU2000.02 http://hpiers.obspm.fr/eoppc/eop/eopc04/eopc04_IAU2000.03 - anonymous ftp: hpiers.obspm.fr files : /eop-pc/eop/eopc04/eopc04_IAU2000.02 /eop-pc/eop/eopc04/eopc04_IAU2000.03 Software to transform from one representation to another is available in Fortran 77/90 at the following Web/ftp sites: - Web page: http://hpiers.obspm.fr/eop-pc/models/models.html#software Files: ftp://hpiers.obspm.fr/eop-pc/models/uai2000.package ftp://hpiers.obspm.fr/eop-pc/models/uai2000.package.readme - anonymous ftp: hpiers.obspm.fr files : /eop-pc/models/uai2000.package /eop-pc/models/uai2000.package.readme Dennis McCarthy and Daniel Gambis *************************************************************************** IERS Messages are edited and distributed by the IERS Central Bureau. To subscribe or unsubscribe, please write to . Archives: http://www.iers.org/iers/publications/messages/ ***************************************************************************