SUBROUTINE iau_ATCCQ ( RC, DC, PR, PD, PX, RV, ASTROM, RA, DA )
*+
* - - - - - - - - - -
* i a u _ A T C C Q
* - - - - - - - - - -
*
* Quick transformation of a star's ICRS catalog entry (epoch J2000.0)
* into ICRS astrometric place, 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 transformation has
* no effect.
*
* 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:
* RA,DA d ICRS astrometric 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_C2S p-vector to spherical
* iau_ANP normalize angle into range 0 to 2pi
*
* This revision: 2021 April 18
*
* SOFA release 2021-05-12
*
* Copyright (C) 2021 IAU SOFA Board. See notes at end.
*
*-----------------------------------------------------------------------
IMPLICIT NONE
DOUBLE PRECISION RC, DC, PR, PD, PX, RV, ASTROM(30), RA, DA
DOUBLE PRECISION P(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), P )
* ICRS astrometric RA,Dec.
CALL iau_C2S ( P, W, DA )
RA = iau_ANP ( W )
* Finished.
*+----------------------------------------------------------------------
*
* Copyright (C) 2021
* 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.
*
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*
* 2. Permission is granted to anyone to use the SOFA software for any
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*
* 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,
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*
* a) Your work shall be marked or carry a statement that it
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* Note that, as originally distributed, the SOFA software is
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*
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*
*-----------------------------------------------------------------------
END