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.help h2fk5 Jun99 "Slalib Package"
.nf
SUBROUTINE slHFK5 (RH,DH,DRH,DDH,R5,D5,DR5,DD5)
- - - - - -
H 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: slDSC6, slDAVM, slDMXV, slDIMV, slDVXV,
slDC6S
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 slFK5H, slF5HZ, 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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