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:
*
*     M.Feissel & F.Mignard, Astron. Astrophys. 331, L33-L36 (1998).
*
*  This revision:  2001 January 4
*
*  Copyright (C) 2001 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 wrt 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) 2001
*  Standards Of Fundamental Astronomy Review Board
*  of the International Astronomical Union.
*
*  =====================
*  SOFA Software License
*  =====================
*
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*
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*
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*
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*-----------------------------------------------------------------------

      END