SUBROUTINE iau_ATCIQ ( RC, DC, PR, PD, PX, RV, ASTROM, RI, DI ) *+ * - - - - - - - - - - * i a u _ A T C I Q * - - - - - - - - - - * * Quick ICRS, epoch J2000.0, to CIRS transformation, given precomputed * star-independent astrometry parameters. * * Use of this routine is appropriate when efficiency is important and * where many star positions are to be transformed for one date. The * star-independent parameters can be obtained by calling one of the * routines iau_APCI[13], iau_APCG[13], iau_APCO[13] or iau_APCS[13]. * * If the parallax and proper motions are zero the iau_ATCIQZ routine * can be used instead. * * This routine is part of the International Astronomical Union's * SOFA (Standards of Fundamental Astronomy) software collection. * * Status: support routine. * * Given: * RC,DC d ICRS RA,Dec at J2000.0 (radians) * PR d RA proper motion (radians/year; Note 3) * PD d Dec proper motion (radians/year) * PX d parallax (arcsec) * RV d radial velocity (km/s, +ve if receding) * ASTROM d(30) star-independent astrometry parameters: * (1) PM time interval (SSB, Julian years) * (2-4) SSB to observer (vector, au) * (5-7) Sun to observer (unit vector) * (8) distance from Sun to observer (au) * (9-11) v: barycentric observer velocity (vector, c) * (12) sqrt(1-|v|^2): reciprocal of Lorenz factor * (13-21) bias-precession-nutation matrix * (22) longitude + s' (radians) * (23) polar motion xp wrt local meridian (radians) * (24) polar motion yp wrt local meridian (radians) * (25) sine of geodetic latitude * (26) cosine of geodetic latitude * (27) magnitude of diurnal aberration vector * (28) "local" Earth rotation angle (radians) * (29) refraction constant A (radians) * (30) refraction constant B (radians) * * Returned: * RI,DI d CIRS RA,Dec (radians) * * Notes: * * 1) All the vectors are with respect to BCRS axes. * * 2) Star data for an epoch other than J2000.0 (for example from the * Hipparcos catalog, which has an epoch of J1991.25) will require a * preliminary call to iau_PMSAFE before use. * * 3) The proper motion in RA is dRA/dt rather than cos(Dec)*dRA/dt. * * Called: * iau_PMPX proper motion and parallax * iau_LDSUN light deflection by the Sun * iau_AB stellar aberration * iau_RXP product of r-matrix and pv-vector * iau_C2S p-vector to spherical * iau_ANP normalize angle into range 0 to 2pi * * This revision: 2013 August 25 * * SOFA release 2013-12-02 * * Copyright (C) 2013 IAU SOFA Board. See notes at end. * *----------------------------------------------------------------------- IMPLICIT NONE DOUBLE PRECISION RC, DC, PR, PD, PX, RV, ASTROM(30), RI, DI DOUBLE PRECISION PCO(3), PNAT(3), PPR(3), PI(3), W DOUBLE PRECISION iau_ANP * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - * Proper motion and parallax, giving BCRS coordinate direction. CALL iau_PMPX ( RC, DC, PR, PD, PX, RV, ASTROM(1), ASTROM(2), : PCO ) * Light deflection by the Sun, giving BCRS natural direction. CALL iau_LDSUN ( PCO, ASTROM(5), ASTROM(8), PNAT ) * Aberration, giving GCRS proper direction. CALL iau_AB (PNAT, ASTROM(9), ASTROM(8), ASTROM(12), PPR ) * Bias-precession-nutation, giving CIRS proper direction. CALL iau_RXP ( ASTROM(13), PPR, PI ) * CIRS RA,Dec. CALL iau_C2S ( PI, W, DI ) RI = iau_ANP ( W ) * Finished. *+---------------------------------------------------------------------- * * Copyright (C) 2013 * 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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