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 catalogue 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: * * M.Feissel & F.Mignard, Astron. Astrophys. 331, L33-L36 (1998). * * This revision: 2001 January 4 * * Copyright (C) 2001 IAU SOFA Review 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 wrt 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) 2001 * Standards Of Fundamental Astronomy Review Board * of the International Astronomical Union. * * ===================== * SOFA Software License * ===================== * * NOTICE TO USER: * * BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING TERMS AND CONDITIONS * WHICH APPLY TO ITS USE. * * 1. The Software is owned by the IAU SOFA Review Board ("the Board"). * * 2. The Software is made available free of charge for use by: * * a) private individuals for non-profit research; and * * b) non-profit educational, academic and research institutions. * * 3. Commercial use of the Software is specifically excluded from the * terms and conditions of this license. Commercial use of the * Software is subject to the prior written agreement of the Board on * terms to be agreed. * * 4. The provision of any version of the 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. * * 5. The user may modify the Software for his/her own purposes. The * user may distribute the modified software provided that the Board * is informed and that a copy of the modified software is made * available to the Board on request. All modifications made by the * user shall be clearly identified to show how the modified software * differs from the original Software, and the name(s) of the * affected routine(s) shall be changed. The original SOFA Software * License text must be present. * * 6. In any published work produced by the user and which includes * results achieved by using the Software, the user shall acknowledge * that the Software was used in producing the information contained * in such publication. * * 7. The user may incorporate or embed the Software into other software * products which he/she may then give away free of charge but not * sell provided the user makes due acknowledgement of the use which * he/she has made of the Software in creating such software * products. Any redistribution of the Software in this way shall be * made under the same terms and conditions under which the user * received it from the SOFA Center. * * 8. The user shall not cause the Software to be brought into * disrepute, either by misuse, or use for inappropriate tasks, or by * inappropriate modification. * * 9. The Software is provided to the user "as is" and the Board makes * no warranty as to its use or performance. The Board does not and * cannot warrant the performance or results which the user may * obtain by using the Software. The Board makes no warranties, * express or implied, as to non-infringement of third party rights, * merchantability, or fitness for any particular purpose. In no * event will the Board be liable to the user for any consequential, * incidental, or special damages, including any lost profits or lost * savings, even if a Board representative has been advised of such * damages, or for any claim by any third party. * * Correspondence concerning SOFA software should be addressed as * follows: * * Internet email: sofa@rl.ac.uk * Postal address: IAU SOFA Center * Rutherford Appleton Laboratory * Chilton, Didcot, Oxon OX11 0QX * United Kingdom * * *----------------------------------------------------------------------- END