slaAddet -

SYNOPSYS

PARAMETERS

double rm

double dm

double eq

double *rc

double *dc

DESCRIPTION

  Add the e-terms (elliptic component of annual aberration) to a
  pre IAU 1976 mean place to conform to the old catalogue convention.

Given

     rm,dm     double     RA,Dec (radians) without e-terms
     eq        double     Besselian epoch of mean equator and equinox

Returned

     *rc,*dc   double     RA,dec (radians) with e-terms included

Called

     slaEtrms, slaDcs2c, slaDcc2s, slaDranrm, slaDrange

Explanation

     Most star positions from pre-1984 optical catalogues (or
     derived from astrometry using such stars) embody the
     e-terms.  If it is necessary to convert a formal mean
     place (for example a pulsar timing position) to one
     consistent with such a star catalogue, then the RA,Dec
     should be adjusted using this routine.

Reference

     Explanatory Supplement to the Astronomical Almanac,
     ed P.K.Seidelmann (1992), page 169.

  P.T.Wallace   Starlink   31 October 1993

SEE ALSO

• slalib.3