J/A+A/406/1135ivo://CDS.VizieR/J/A+A/406/1135doi:10.26093/cds/vizier.34061135CDSCapitaine N.Wallace P.T.McCarthy D.D.2006-05-08T18:52:41Z2006-05-08T18:51:04ZCDS support team

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

cds-question@unistra.frearth-planetephemeridesThis paper provides expressions to be used to implement the new definition of UT1 corresponding to the IAU 2000 resolutions either in the new (CEO-based) or classical (equinox-based) transformations between the International Terrestrial Reference System (ITRS) and the Geocentric Celestial Reference System (GCRS). The new expression for Greenwich Sidereal Time (GST) has to be in agreement at the micro-arcsecond level, for one century, with the IAU 2000 expressions for the Earth Rotation Angle (ERA) and for the quantity s positioning the Celestial Ephemeris Origin (CEO) on the equator of the CIP. The computations of the new expressions using the IAU 2000 precession-nutation model are performed in such a manner as to ensure that there is no discontinuity in UT1 on 1 January 2003 and that there is equivalence of the classical and new transformations between the ITRS and GCRS relative to the rotation about the axis of the CIP when these expressions are used. The equinox offset that is considered in the computations refers to the dynamical mean equinox of J2000.0. The resulting expressions have been included in the IERS Conventions 2000.2003A&A...406.1135Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/406/1135CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/355/398 : Celestial Ephemeris Origin definition (Capitaine+, 2000)J/A+A/400/1145 : Celestial Intermediate Pole + Ephemeris Originhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/406/1135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/406/1135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/406/1135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/406/1135https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/406/1135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/406/1135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/406/1135/tablebExpression (IAU 2000A) of the Y coordinate of the CIP in the GCRS provided by N. CapitainerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintj[0/4] Number jmeta.numberintnjNumber of terms (i) for jmeta.numberintiNumber i (range [0 .. nj])meta.numberinti(s,j)a_{s,j})_i (X), b_{s,j})_i (Y) or c_{s,j})_i (S(t)+XY/2) coefficientstat.paramdoublei(c,j)a_{c,j})_i (X), b_{c,j})_i (Y) or c_{c,j})_i (S(t)+XY/2) coefficientstat.paramdoublelMean anomaly of the Moon coefficientstat.paramintl'Mean anomaly of the Sun coefficientstat.paramintFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintDMean elongation from the Moon to the Sun coefficientstat.paramintOmegaMean longitude of the ascending node of the Moon coefficientstat.paramintLMeMean longitude of Mercure coefficientstat.paramintLVeMean longitude of Venus coefficientstat.paramintLEMean longitude of the Earth coefficientstat.paramintLMaMean longitude of Mars coefficientstat.paramintLJMean longitude of Jupiter coefficientstat.paramintLSaMean longitude of Saturn coefficientstat.paramintLUMean longitude of Uranus coefficientstat.paramintLNeMean longitude of Neptune coefficientstat.paramintpAGeneral precession in longitude coefficientstat.paramintJ/A+A/406/1135/tablecExpression (IAU 2000A) of the s(t)+XY/2 quantity provided provided by N. CapitainerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintj[0/4] Number jmeta.numberintnjNumber of terms (i) for jmeta.numberintiNumber i (range [0 .. nj])meta.numberinti(s,j)a_{s,j})_i (X), b_{s,j})_i (Y) or c_{s,j})_i (S(t)+XY/2) coefficientstat.paramdoublei(c,j)a_{c,j})_i (X), b_{c,j})_i (Y) or c_{c,j})_i (S(t)+XY/2) coefficientstat.paramdoublelMean anomaly of the Moon coefficientstat.paramintl'Mean anomaly of the Sun coefficientstat.paramintFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintDMean elongation from the Moon to the Sun coefficientstat.paramintOmegaMean longitude of the ascending node of the Moon coefficientstat.paramintLMeMean longitude of Mercure coefficientstat.paramintLVeMean longitude of Venus coefficientstat.paramintLEMean longitude of the Earth coefficientstat.paramintLMaMean longitude of Mars coefficientstat.paramintLJMean longitude of Jupiter coefficientstat.paramintLSaMean longitude of Saturn coefficientstat.paramintLUMean longitude of Uranus coefficientstat.paramintLNeMean longitude of Neptune coefficientstat.paramintpAGeneral precession in longitude coefficientstat.paramintJ/A+A/406/1135/tablefExpression for Greenwich Sidereal Time based on the IAU2000A precession-nutation modelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintj[0/4] Number jmeta.numberintnjNumber of terms (i) for jmeta.numberintiNumber i (range [0 .. nj])meta.numberinti(s,j)a_{s,j})_i (X), b_{s,j})_i (Y) or c_{s,j})_i (S(t)+XY/2) coefficientstat.paramdoublei(c,j)a_{c,j})_i (X), b_{c,j})_i (Y) or c_{c,j})_i (S(t)+XY/2) coefficientstat.paramdoublelMean anomaly of the Moon coefficientstat.paramintl'Mean anomaly of the Sun coefficientstat.paramintFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintDMean elongation from the Moon to the Sun coefficientstat.paramintOmegaMean longitude of the ascending node of the Moon coefficientstat.paramintLMeMean longitude of Mercure coefficientstat.paramintLVeMean longitude of Venus coefficientstat.paramintLEMean longitude of the Earth coefficientstat.paramintLMaMean longitude of Mars coefficientstat.paramintLJMean longitude of Jupiter coefficientstat.paramintLSaMean longitude of Saturn coefficientstat.paramintLUMean longitude of Uranus coefficientstat.paramintLNeMean longitude of Neptune coefficientstat.paramintpAGeneral precession in longitude coefficientstat.paramintJ/A+A/406/1135/tableaExpression (IAU 2000A) of the X coordinate of the CIP in the GCRS provided by N. Capitainej[0/4] Number jmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnjNumber of terms (i) for jmeta.numberintiNumber i (range [0 .. nj])meta.numberinti(s,j)a_{s,j})_i (X), b_{s,j})_i (Y) or c_{s,j})_i (S(t)+XY/2) coefficientstat.paramdoublei(c,j)a_{c,j})_i (X), b_{c,j})_i (Y) or c_{c,j})_i (S(t)+XY/2) coefficientstat.paramdoublelMean anomaly of the Moon coefficientstat.paramintl'Mean anomaly of the Sun coefficientstat.paramintFL - Omega (L: Mean longitude of the Moon) coefficientstat.paramintDMean elongation from the Moon to the Sun coefficientstat.paramintOmegaMean longitude of the ascending node of the Moon coefficientstat.paramintLMeMean longitude of Mercure coefficientstat.paramintLVeMean longitude of Venus coefficientstat.paramintLEMean longitude of the Earth coefficientstat.paramintLMaMean longitude of Mars coefficientstat.paramintLJMean longitude of Jupiter coefficientstat.paramintLSaMean longitude of Saturn coefficientstat.paramintLUMean longitude of Uranus coefficientstat.paramintLNeMean longitude of Neptune coefficientstat.paramintpAGeneral precession in longitude coefficientstat.paramint