SUBROUTINE iau_H2FK5 ( RH, DH, DRH, DDH, PXH, RVH,
     :                       R5, D5, DR5, DD5, PX5, RV5 )
*+
*  - - - - - - - - - -
*   i a u _ H 2 F K 5
*  - - - - - - - - - -
*
*  Transform Hipparcos star data into the FK5 (J2000) system.
*
*  This routine is part of the International Astronomical Union's
*  SOFA (Standards of Fundamental Astronomy) software collection.
*
*  Status:  support routine.
*
*  Given (all Hipparcos, epoch J2000):
*     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 (+ve = receding)
*
*  Returned (all FK5, equinox J2000, epoch J2000):
*     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 (+ve = receding)
*
*  Notes:
*
*  1) This routine transforms Hipparcos star positions and proper
*     motions into FK5 J2000.
*
*  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 catalogue are
*     not taken into account.
*
*  4) See also iau_FK52H, iau_FK5HZ, iau_HFK5Z.
*
*  Called:
*     iau_STARPV  star catalog data to pv-vector
*     iau_FK5HIP  FK5 rotation and spin wrt to Hipparcos
*     iau_RV2M    r-vector to r-matrix
*     iau_RXP     product of r-matrix and p-vector
*     iau_TRXP    product of transpose of r-matrix and p-vector
*     iau_PXP     outer (=vector=cross) product of two p-vectors
*     iau_PMP     p-vector minus p-vector
*     iau_PVSTAR  pv-vector to star catalog data
*
*  Reference:
*
*     M.Feissel & F.Mignard, Astron. Astrophys. 331, L33-L36 (1998).
*
*  This revision:  2001 February 28
*
*  Copyright (C) 2001 IAU SOFA Review Board.  See notes at end.
*
*-----------------------------------------------------------------------

      IMPLICIT NONE

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

*  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 PVH(3,2), R5H(3,3), S5H(3), SH(3), WXP(3),
     :                 VV(3), PV5(3,2)
      INTEGER J

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

*  Hipparcos barycentric position/velocity pv-vector (normalized).
      CALL iau_STARPV ( RH, DH, DRH, DDH, PXH, RVH, PVH, J )

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

*  Orient the spin into the Hipparcos frame.
      CALL iau_RXP ( R5H, S5H, SH )

*  De-orient the Hipparcos position into the FK5 frame.
      CALL iau_TRXP ( R5H, PVH(1,1), PV5(1,1) )

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

*  Subtract this component from the Hipparcos space motion.
      CALL iau_PMP ( WXP, PVH(1,2), VV )

*  De-orient the Hipparcos space motion into the FK5 frame.
      CALL iau_TRXP ( R5H, VV, PV5(1,2) )

*  FK5 pv-vector to spherical.
      CALL iau_PVSTAR ( PV5, R5, D5, DR5, DD5, PX5, RV5, J )

*  Finished.

*+----------------------------------------------------------------------
*
*  Copyright (C) 2001
*  Standards Of Fundamental Astronomy Review Board
*  of the International Astronomical Union.
*
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*-----------------------------------------------------------------------

      END