Description:
Add the E-terms (elliptic
component of annual aberration) to a pre IAU 1976 mean place to conform to the old catalogue
convention.
Invocation
void palAddet ( double rm, double dm, double eq, double
rc, double
dc );
Arguments
rm = double (Given)
RA without E-terms (radians)
dm = double (Given)
Dec without
E-terms (radians)
eq = double (Given)
Besselian epoch of mean equator and equinox
rc = double
(Returned)
RA with E-terms included (radians)
dc = double
(Returned)
Dec with E-terms included (radians)
Notes:
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.
See Also
Explanatory Supplement to the Astronomical Ephemeris, section 2D, page 48.
Copyright © 2012 Science and Technology Facilities Council.
Copyright © 2014 Cornell University.
Copyright © 2015 Tim Jenness