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: * * F.Mignard & M.Froeschle, Astron. Astrophys. 354, 732-739 (2000). * * This revision: 2008 January 18 * * Copyright (C) 2008 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 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) 2008 * 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. 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 adapt the SOFA software and its * algorithms for your own purposes and you may copy and distribute * a resulting "derived work" to others on a world-wide, royalty-free * basis, provided that the derived work complies with the following * requirements: * * a) Your work shall be marked or carry a statement that it (i) uses * routines and computations derived by you from software provided * by SOFA under license to you; and (ii) does not contain * software provided by SOFA or software that has been distributed * by or endorsed by SOFA. * * b) The source code of your derived work must contain descriptions * of how the derived work is based upon and/or differs from the * original SOFA software. * * c) The name(s) of all routine(s) that you distribute shall differ * from the SOFA names, even when the SOFA content has not been * otherwise changed. * * d) The routine-naming prefix "iau" shall not be used. * * e) The origin of the SOFA components of your derived work must not * be misrepresented; you must not claim that you wrote the * original software, nor file a patent application for SOFA * software or algorithms embedded in the SOFA software. * * f) These requirements must be reproduced intact in any source * distribution and shall apply to anyone to whom you have granted * a further right to modify the source code of your derived work. * * 4. In any published work or commercial products which includes * results achieved by using the SOFA software, you shall acknowledge * that the SOFA software was used in obtaining those results. * * 5. You shall not cause the SOFA software to be brought into * disrepute, either by misuse, or use for inappropriate tasks, or by * inappropriate modification. * * 6. The SOFA software is provided "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 SOFA 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. * * 7. 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. * * 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