slaPm -

SYNOPSYS

PARAMETERS

double r0

double d0

double pr

double pd

double px

double rv

double ep0

double ep1

double *r1

double *d1

DESCRIPTION

  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    double     RA,Dec at epoch ep0 (rad)
     pr,pd    double     proper motions:  RA,Dec changes per year of epoch
     px       double     parallax (arcsec)
     rv       double     radial velocity (km/sec, +ve if receding)
     ep0      double     start epoch in years (e.g Julian epoch)
     ep1      double     end epoch in years (same system as ep0)

Returned

     *r1,*d1  double     RA,Dec at epoch ep1 (rad)

  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.

Called

 slaDcs2c, slaDcc2s, slaDranrm

  Defined in slamac.h:  DAS2R

  P.T.Wallace   Starlink   31 October 1993

SEE ALSO

• slalib.3