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+<TITLE>SLA_PM - Proper Motion</TITLE>
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+<H2><A NAME="SECTION0004136000000000000000">SLA_PM - Proper Motion</A>
+<A NAME="xref_SLA_PM">&#160;</A><A NAME="SLA_PM">&#160;</A>
+</H2>
+ <DL>
+<DT><STRONG>ACTION:</STRONG>
+<DD>Apply corrections for proper motion to a star <IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
+ SRC="img3.gif"
+ ALT="$[\,\alpha,\delta\,]$">.<DT><STRONG>CALL:</STRONG>
+<DD><TT>CALL sla_PM (R0, D0, PR, PD, PX, RV, EP0, EP1, R1, D1)</TT>
+<P> </DL>
+<P> <DL>
+<DT><STRONG>GIVEN:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>R0,D0</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="$[\,\alpha,\delta\,]$"> at epoch EP0 (radians)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>PR,PD</EM></TD>
+<TD ALIGN="LEFT"><B>D</B></TD>
+<TD ALIGN="LEFT" NOWRAP>proper motions: rate of change of
+<IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
+ SRC="img3.gif"
+ ALT="$[\,\alpha,\delta\,]$"> (radians per year)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>PX</EM></TD>
+<TD ALIGN="LEFT"><B>D</B></TD>
+<TD ALIGN="LEFT" NOWRAP>parallax (arcsec)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>RV</EM></TD>
+<TD ALIGN="LEFT"><B>D</B></TD>
+<TD ALIGN="LEFT" NOWRAP>radial velocity (km&nbsp;s<SUP>-1</SUP>, +ve if receding)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EP0</EM></TD>
+<TD ALIGN="LEFT"><B>D</B></TD>
+<TD ALIGN="LEFT" NOWRAP>start epoch in years (<I>e.g.</I> Julian epoch)</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>EP1</EM></TD>
+<TD ALIGN="LEFT"><B>D</B></TD>
+<TD ALIGN="LEFT" NOWRAP>end epoch in years (same system as EP0)</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>RETURNED:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>R1,D1</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="$[\,\alpha,\delta\,]$"> at epoch EP1 (radians)</TD>
+</TR>
+</TABLE></DL>
+<P> <DL>
+<DT><STRONG>NOTE:</STRONG>
+<DD>The <IMG WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
+ SRC="img24.gif"
+ ALT="$\alpha$"> proper motions are <IMG WIDTH="13" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
+ SRC="img115.gif"
+ ALT="$\dot{\alpha}$"> rather than
+<IMG WIDTH="48" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
+ SRC="img116.gif"
+ ALT="$\dot{\alpha}\cos\delta$">, and are in the same coordinate
+ system as R0,D0.
+ </DL>
+<P> <DL>
+<DT><STRONG>REFERENCES:</STRONG>
+<DD><DL COMPACT>
+<DT>1.
+<DD>1984 <I>Astronomical Almanac</I>, pp B39-B41.
+<DT>2.
+<DD>Lederle &amp; Schwan, 1984. <I>Astr. Astrophys.</I> <B>134</B>, 1-6.
+</DL></DL>
+<BR> <HR>
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+<BR>
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+<B>Up:</B> <A NAME="tex2html1915" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A>
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+<BR> <HR> <P>
+<P><!--End of Navigation Panel-->
+<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>
+</ADDRESS>
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