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SUBROUTINE sla_H2FK5 (RH,DH,DRH,DDH,R5,D5,DR5,DD5)
*+
* - - - - - -
* H 2 F K 5
* - - - - - -
*
* Transform Hipparcos star data into the FK5 (J2000) system.
*
* (double precision)
*
* This routine transforms Hipparcos star positions and proper
* motions into FK5 J2000.
*
* 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)
*
* 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)
*
* Called: sla_DS2C6, sla_DAV2M, sla_DMXV, sla_DIMXV, sla_DVXV,
* sla_DC62S, sla_DRANRM
*
* Notes:
*
* 1) The proper motions in RA are dRA/dt rather than
* cos(Dec)*dRA/dt, and are per year rather than per century.
*
* 2) The FK5 to Hipparcos transformation consists of a pure
* rotation and spin; zonal errors in the FK5 catalogue are
* not taken into account.
*
* 3) The published orientation and spin components are interpreted
* as "axial vectors". An axial vector points at the pole of the
* rotation and its length is the amount of rotation in radians.
*
* 4) See also sla_FK52H, sla_FK5HZ, sla_HFK5Z.
*
* Reference:
*
* M.Feissel & F.Mignard, Astron. Astrophys. 331, L33-L36 (1998).
*
* P.T.Wallace Starlink 22 June 1999
*
* Copyright (C) 1999 Rutherford Appleton Laboratory
*-
IMPLICIT NONE
DOUBLE PRECISION RH,DH,DRH,DDH,R5,D5,DR5,DD5
DOUBLE PRECISION AS2R
PARAMETER (AS2R=0.484813681109535994D-5)
* FK5 to Hipparcos orientation and spin (radians, radians/year)
DOUBLE PRECISION EPX,EPY,EPZ
DOUBLE PRECISION OMX,OMY,OMZ
PARAMETER ( EPX = -19.9D-3 * AS2R,
: EPY = -9.1D-3 * AS2R,
: EPZ = +22.9D-3 * AS2R )
PARAMETER ( OMX = -0.30D-3 * AS2R,
: OMY = +0.60D-3 * AS2R,
: OMZ = +0.70D-3 * AS2R )
DOUBLE PRECISION PVH(6),ORTN(3),R5H(3,3),S5(3),SH(3),VV(3),
: PV5(6),W,R,V
INTEGER I
DOUBLE PRECISION sla_DRANRM
* Hipparcos barycentric position/velocity 6-vector (normalized).
CALL sla_DS2C6(RH,DH,1D0,DRH,DDH,0D0,PVH)
* FK5 to Hipparcos orientation matrix.
ORTN(1) = EPX
ORTN(2) = EPY
ORTN(3) = EPZ
CALL sla_DAV2M(ORTN,R5H)
* Hipparcos wrt FK5 spin vector.
S5(1) = OMX
S5(2) = OMY
S5(3) = OMZ
* Rotate the spin vector into the Hipparcos frame.
CALL sla_DMXV(R5H,S5,SH)
* De-orient & de-spin the 6-vector into FK5 J2000.
CALL sla_DIMXV(R5H,PVH,PV5)
CALL sla_DVXV(PVH,SH,VV)
DO I=1,3
VV(I) = PVH(I+3)-VV(I)
END DO
CALL sla_DIMXV(R5H,VV,PV5(4))
* FK5 6-vector to spherical.
CALL sla_DC62S(PV5,W,D5,R,DR5,DD5,V)
R5 = sla_DRANRM(W)
END
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