Add the E-terms (elliptic component of annual aberration) to a pre IAU 1976 mean
place to conform to the old catalogue convention.
CALL:
CALL sla_ADDET (RM, DM, EQ, RC, DC)
GIVEN:
RM,DM
D
[α,δ] without
E-terms (radians)
EQ
D
Besselian epoch of mean equator and equinox
RETURNED:
RC,DC
D
[α,δ] with
E-terms included (radians)
NOTE:
Most star positions from pre-1984 optical catalogues (or obtained by astrometry with
respect to such stars) have the E-terms built-in. 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 [α,δ] should
be adjusted using this routine.
REFERENCE:
Explanatory Supplement to the Astronomical Ephemeris, section 2D, page 48.