J/A+A/400/1145ivo://CDS.VizieR/J/A+A/400/1145doi:10.26093/cds/vizier.34001145CDSCapitaine N.Chapront J.Lambert S.Wallace P.T.2003-04-12T18:03:37Z2003-04-12T18:01:47ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frephemeridesearth-planetExpressions for the position of the Celestial Intermediate Pole (CIP) and the Celestial Ephemeris Origin (CEO) in the Geocentric Celestial Reference System (GCRS) have been computed using the IAU 2000A precession-nutation. These expressions are for use in the new transformation between the GCRS and the International Terrestrial Reference System (ITRS) which is recommended by IAU Resolution B1.8. Various comparisons and numerical checks have been performed between the classical and the new transformations based on the IAU 2000A precession-nutation. These comparisons revealed necessary improvements to be applied to the classical form of the transformation in order to achieve the required level of accuracy. Once these improvements are applied, the consistency between the positions of the CIP in the GCRS corresponding to the classical and the new transformations is at a level of a few microarcseconds after one century. This work has demonstrated that the new method, in addition to providing an explicit separation between precession-nutation of the equator from Earth rotation, is more simple, compact and direct than the classical one, achieving accuracies at the level of a few microarcseconds with greatly reduced scope for accidental misuse. The resulting expressions for X, Y and s have been included in the IERS Conventions 2000.2003A&A...400.1145Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/400/1145CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/355/398 : Celestial Ephemeris Origin definition (Capitaine+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/400/1145https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/400/1145http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/400/1145https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/400/1145https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/400/1145http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/400/1145GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/400/1145/tableaNon-polynomial terms in the development of the coordinate X(t) of the Celestial Intermediate Pole in the ICRS compatible with IAU 2000A precession-nutation model (unit mas)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNNumber of records of order jmeta.numberintjOrder of the Poisson term (power of t)meta.idintiTerm number imeta.idintasjia_{s,j})_i coefficient, in micro-arcsecuarcsecstat.paramdoubleacjia_{c,j})_i coefficient, in micro-arcsecuarcsecstat.paramdoublenlMean anomaly of the Moon coefficientstat.paramintnl'Mean anomaly of the Sun coefficientstat.paramintnFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintnDMean elongation from the Moon to the Sun coefficientstat.paramintnOmMean longitude of the ascending node of the Moon (Omega) coefficientstat.paramintnLMeMean longitude of Mercure coefficientstat.paramintnLVMean longitude of Venus coefficientstat.paramintnLEMean longitude of the Earth coefficientstat.paramintnLMaMean longitude of Mars coefficientstat.paramintnLJMean longitude of Jupiter coefficientstat.paramintnLSMean longitude of Saturn coefficientstat.paramintnLUMean longitude of Uranus coefficientstat.paramintnLNMean longitude of Neptune coefficientstat.paramintnpaAccumulated general precession in longitude coefficientstat.paramintJ/A+A/400/1145/tablebNon-polynomial terms in the development of the coordinate Y(t) of the Celestial Intermediate Pole in the ICRS compatible with IAU 2000A precession-nutation model (unit mas)NNumber of records of order jmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintjOrder of the Poisson term (power of t)meta.idintiTerm number imeta.idintbsjib_{s,j})_i coefficient, in micro-arcsecuarcsecstat.paramdoublebcjib_{c,j})_i coefficient, in micro-arcsecuarcsecstat.paramdoublenlMean anomaly of the Moon coefficientstat.paramintnl'Mean anomaly of the Sun coefficientstat.paramintnFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintnDMean elongation from the Moon to the Sun coefficientstat.paramintnOmMean longitude of the ascending node of the Moon (Omega) coefficientstat.paramintnLMeMean longitude of Mercure coefficientstat.paramintnLVMean longitude of Venus coefficientstat.paramintnLEMean longitude of the Earth coefficientstat.paramintnLMaMean longitude of Mars coefficientstat.paramintnLJMean longitude of Jupiter coefficientstat.paramintnLSMean longitude of Saturn coefficientstat.paramintnLUMean longitude of Uranus coefficientstat.paramintnLNMean longitude of Neptune coefficientstat.paramintnpaAccumulated general precession in longitude coefficientstat.paramintJ/A+A/400/1145/tablecNon-polynomial terms in the development of the quantity s(t)+XY/2 compatible with IAU 2000A precession-nutation model (unit mas)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNNumber of records of order jmeta.numberintjOrder of the Poisson term (power of t)meta.idintiTerm number imeta.idintCsjiC_{s,j})_i coefficient, in micro-arcsecuarcsecstat.paramdoubleCcjiC_{c,j})_i coefficient, in micro-arcsecuarcsecstat.paramdoublenlMean anomaly of the Moon coefficientstat.paramintnl'Mean anomaly of the Sun coefficientstat.paramintnFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintnDMean elongation from the Moon to the Sun coefficientstat.paramintnOmMean longitude of the ascending node of the Moon (Omega) coefficientstat.paramintnLMeMean longitude of Mercure coefficientstat.paramintnLVMean longitude of Venus coefficientstat.paramintnLEMean longitude of the Earth coefficientstat.paramintnLMaMean longitude of Mars coefficientstat.paramintnLJMean longitude of Jupiter coefficientstat.paramintnLSMean longitude of Saturn coefficientstat.paramintnLUMean longitude of Uranus coefficientstat.paramintnLNMean longitude of Neptune coefficientstat.paramintnpaAccumulated general precession in longitude coefficientstat.paramint