SUBROUTINE iau_FK52H ( R5, D5, DR5, DD5, PX5, RV5,
     :                       RH, DH, DRH, DDH, PXH, RVH )
*+
*  - - - - - - - - - -
*   i a u _ F K 5 2 H
*  - - - - - - - - - -
*
*  Transform FK5 (J2000.0) star data into the Hipparcos system.
*
*  This routine is part of the International Astronomical Union's
*  SOFA (Standards of Fundamental Astronomy) software collection.
*
*  Status:  support routine.
*
*  Given (all FK5, equinox J2000.0, epoch J2000.0):
*     R5        d      RA (radians)
*     D5        d      Dec (radians)
*     DR5       d      proper motion in RA (dRA/dt, rad/Jyear)
*     DD5       d      proper motion in Dec (dDec/dt, rad/Jyear)
*     PX5       d      parallax (arcsec)
*     RV5       d      radial velocity (km/s, positive = receding)
*
*  Returned (all Hipparcos, epoch J2000.0):
*     RH        d      RA (radians)
*     DH        d      Dec (radians)
*     DRH       d      proper motion in RA (dRA/dt, rad/Jyear)
*     DDH       d      proper motion in Dec (dDec/dt, rad/Jyear)
*     PXH       d      parallax (arcsec)
*     RVH       d      radial velocity (km/s, positive = receding)
*
*  Notes:
*
*  1) This routine transforms FK5 star positions and proper motions into
*     the system of the Hipparcos catalog.
*
*  2) The proper motions in RA are dRA/dt rather than cos(Dec)*dRA/dt,
*     and are per year rather than per century.
*
*  3) The FK5 to Hipparcos transformation is modeled as a pure rotation
*     and spin;  zonal errors in the FK5 catalog are not taken into
*     account.
*
*  4) See also iau_H2FK5, iau_FK5HZ, iau_HFK5Z.
*
*  Called:
*     iau_STARPV   star catalog data to space motion pv-vector
*     iau_FK5HIP   FK5 to Hipparcos rotation and spin
*     iau_RXP      product of r-matrix and p-vector
*     iau_PXP      vector product of two p-vectors
*     iau_PPP      p-vector plus p-vector
*     iau_PVSTAR   space motion pv-vector to star catalog data
*
*  Reference:
*
*     F.Mignard & M.Froeschle, Astron.Astrophys., 354, 732-739 (2000).
*
*  This revision:  2017 October 12
*
*  SOFA release 2020-07-21
*
*  Copyright (C) 2020 IAU SOFA Board.  See notes at end.
*
*-----------------------------------------------------------------------

      IMPLICIT NONE

      DOUBLE PRECISION R5, D5, DR5, DD5, PX5, RV5,
     :                 RH, DH, DRH, DDH, PXH, RVH

      DOUBLE PRECISION PV5(3,2), R5H(3,3), S5H(3), WXP(3), VV(3),
     :                 PVH(3,2)
      INTEGER J, I

* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

*  FK5 barycentric position/velocity pv-vector (normalized).
      CALL iau_STARPV ( R5, D5, DR5, DD5, PX5, RV5, PV5, J )

*  FK5 to Hipparcos orientation matrix and spin vector.
      CALL iau_FK5HIP ( R5H, S5H )

*  Make spin units per day instead of per year.
      DO 1 I=1,3
         S5H(I) = S5H(I) / 365.25D0
 1    CONTINUE

*  Orient the FK5 position into the Hipparcos system.
      CALL iau_RXP ( R5H, PV5(1,1), PVH(1,1) )

*  Apply spin to the position giving an extra space motion component.
      CALL iau_PXP ( PV5(1,1), S5H, WXP )

*  Add this component to the FK5 space motion.
      CALL iau_PPP ( WXP, PV5(1,2), VV )

*  Orient the FK5 space motion into the Hipparcos system.
      CALL iau_RXP ( R5H, VV, PVH(1,2) )

*  Hipparcos pv-vector to spherical.
      CALL iau_PVSTAR ( PVH, RH, DH, DRH, DDH, PXH, RVH, J )

*  Finished.

*+----------------------------------------------------------------------
*
*  Copyright (C) 2020
*  Standards Of Fundamental Astronomy Board
*  of the International Astronomical Union.
*
*  =====================
*  SOFA Software License
*  =====================
*
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*
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*  CONDITIONS WHICH APPLY TO ITS USE.
*
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*
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*
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*-----------------------------------------------------------------------

      END