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.help fk5hz Jun99 "Slalib Package"
.nf
SUBROUTINE slF5HZ (R5,D5,EPOCH,RH,DH)
- - - - - -
F 5 H Z
- - - - - -
Transform an FK5 (J2000) star position into the frame of the
Hipparcos catalogue, assuming zero Hipparcos proper motion.
(double precision)
This routine converts a star position from the FK5 system to
the Hipparcos system, in such a way that the Hipparcos proper
motion is zero. Because such a star has, in general, a non-zero
proper motion in the FK5 system, the routine requires the epoch
at which the position in the FK5 system was determined.
Given:
R5 d FK5 RA (radians), equinox J2000, epoch EPOCH
D5 d FK5 Dec (radians), equinox J2000, epoch EPOCH
EPOCH d Julian epoch (TDB)
Returned (all Hipparcos):
RH d RA (radians)
DH d Dec (radians)
Called: slDS2C, slDAVM, slDIMV, slDMXV, slDC2S
Notes:
1) The FK5 to Hipparcos transformation consists of a pure
rotation and spin; zonal errors in the FK5 catalogue are
not taken into account.
2) 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.
3) See also slFK5H, slHFK5, slHF5Z.
Reference:
M.Feissel & F.Mignard, Astron. Astrophys. 331, L33-L36 (1998).
P.T.Wallace Starlink 7 October 1998
Copyright (C) 1998 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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