SLA_ADDET

Add E-terms of Aberration

ACTION:
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.