palAddet
palAddet
- Add the E-terms to a pre IAU 1976 mean place
- 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.