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.help pm Jun99 "Slalib Package"
.nf
SUBROUTINE slPM (R0, D0, PR, PD, PX, RV, EP0, EP1, R1, D1)
- - -
P M
- - -
Apply corrections for proper motion to a star RA,Dec
(double precision)
References:
1984 Astronomical Almanac, pp B39-B41.
(also Lederle & Schwan, Astron. Astrophys. 134,
1-6, 1984)
Given:
R0,D0 dp RA,Dec at epoch EP0 (rad)
PR,PD dp proper motions: RA,Dec changes per year of epoch
PX dp parallax (arcsec)
RV dp radial velocity (km/sec, +ve if receding)
EP0 dp start epoch in years (e.g. Julian epoch)
EP1 dp end epoch in years (same system as EP0)
Returned:
R1,D1 dp RA,Dec at epoch EP1 (rad)
Called:
slDS2C spherical to Cartesian
slDC2S Cartesian to spherical
slDA2P normalize angle 0-2Pi
Note:
The proper motions in RA are dRA/dt rather than
cos(Dec)*dRA/dt, and are in the same coordinate
system as R0,D0.
P.T.Wallace Starlink 23 August 1996
Copyright (C) 1996 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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