SUBROUTINE iau_FK5HIP ( R5H, S5H ) *+ * - - - - - - - - - - - * i a u _ F K 5 H I P * - - - - - - - - - - - * * FK5 to Hipparcos rotation and spin. * * This routine is part of the International Astronomical Union's * SOFA (Standards of Fundamental Astronomy) software collection. * * Status: support routine. * * Returned: * R5H d(3,3) r-matrix: FK5 rotation wrt Hipparcos (Note 2) * S5H d(3) r-vector: FK5 spin wrt Hipparcos (Note 3) * * Notes: * * 1) This routine models the FK5 to Hipparcos transformation as a * pure rotation and spin; zonal errors in the FK5 catalog are not * taken into account. * * 2) The r-matrix R5H operates in the sense: * * P_Hipparcos = R5H x P_FK5 * * where P_FK5 is a p-vector in the FK5 frame, and P_Hipparcos is * the equivalent Hipparcos p-vector. * * 3) The r-vector S5H represents the time derivative of the FK5 to * Hipparcos rotation. The units are radians per year (Julian, * TDB). * * Called: * iau_RV2M r-vector to r-matrix * * Reference: * * F.Mignard & M.Froeschle, Astron.Astrophys., 354, 732-739 (2000). * * This revision: 2023 March 6 * * SOFA release 2023-10-11 * * Copyright (C) 2023 IAU SOFA Board. See notes at end. * *----------------------------------------------------------------------- IMPLICIT NONE DOUBLE PRECISION R5H(3,3), S5H(3) * Arcseconds to radians DOUBLE PRECISION DAS2R PARAMETER ( DAS2R = 4.848136811095359935899141D-6 ) * FK5 to Hipparcos orientation and spin (radians, radians/year) DOUBLE PRECISION EPX, EPY, EPZ DOUBLE PRECISION OMX, OMY, OMZ PARAMETER ( EPX = -19.9D-3 * DAS2R, : EPY = -9.1D-3 * DAS2R, : EPZ = +22.9D-3 * DAS2R ) PARAMETER ( OMX = -0.30D-3 * DAS2R, : OMY = +0.60D-3 * DAS2R, : OMZ = +0.70D-3 * DAS2R ) DOUBLE PRECISION V(3) * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * FK5 to Hipparcos orientation expressed as an r-vector. V(1) = EPX V(2) = EPY V(3) = EPZ * Re-express as an r-matrix. CALL iau_RV2M ( V, R5H ) * Hipparcos wrt FK5 spin expressed as an r-vector. S5H(1) = OMX S5H(2) = OMY S5H(3) = OMZ * Finished. *+---------------------------------------------------------------------- * * Copyright (C) 2023 * Standards of Fundamental Astronomy Board * of the International Astronomical Union. * * ===================== * SOFA Software License * ===================== * * NOTICE TO USER: * * BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND * CONDITIONS WHICH APPLY TO ITS USE. * * 1. The Software is owned by the IAU SOFA Board ("SOFA"). * * 2. Permission is granted to anyone to use the SOFA software for any * purpose, including commercial applications, free of charge and * without payment of royalties, subject to the conditions and * restrictions listed below. * * 3. You (the user) may copy and distribute SOFA source code to others, * and use and adapt its code and algorithms in your own software, * on a world-wide, royalty-free basis. 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The provision of any version of the SOFA software under the terms * and conditions specified herein does not imply that future * versions will also be made available under the same terms and * conditions. * * In any published work or commercial product which uses the SOFA * software directly, acknowledgement (see www.iausofa.org) is * appreciated. * * Correspondence concerning SOFA software should be addressed as * follows: * * By email: sofa@ukho.gov.uk * By post: IAU SOFA Center * HM Nautical Almanac Office * UK Hydrographic Office * Admiralty Way, Taunton * Somerset, TA1 2DN * United Kingdom * *----------------------------------------------------------------------- END