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<H2><A NAME="SECTION00041000000000000000">SLA_ADDET - Add E-terms of Aberration</A>
<A NAME="xref_SLA_ADDET"> </A><A NAME="SLA_ADDET"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Add the E-terms (elliptic component of annual aberration) to a
pre IAU 1976 mean place to conform to the old catalogue convention.
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_ADDET (RM, DM, EQ, RC, DC)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RM,DM</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP><IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> without E-terms (radians)</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EQ</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>Besselian epoch of mean equator and equinox</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RC,DC</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP><IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> with E-terms included (radians)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTE:</STRONG>
<DD>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
<IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> should be adjusted using this routine.
</DL>
<P> <DL>
<DT><STRONG>REFERENCE:</STRONG>
<DD><I>Explanatory Supplement to the Astronomical Ephemeris</I>,
section 2D, page 48.
</DL>
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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