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<H2><A NAME="SECTION0004158000000000000000">SLA_RVGALC - RV Corrn to Galactic Centre</A>
<A NAME="xref_SLA_RVGALC"> </A><A NAME="SLA_RVGALC"> </A>
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<DT><STRONG>ACTION:</STRONG>
<DD>Velocity component in a given direction due to the rotation
of the Galaxy.
<P> <DT><STRONG>CALL:</STRONG>
<DD><TT>R = sla_RVGALC (R2000, D2000)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>R2000,D2000</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>J2000.0 mean <IMG WIDTH="42" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$[\,\alpha,\delta\,]$"> (radians)</TD>
</TR>
</TABLE></DL>
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<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>sla_RVGALC</EM></TD>
<TH ALIGN="LEFT"><B>R</B></TH>
<TD ALIGN="LEFT" NOWRAP>Component of dynamical LSR motion in direction
R2000,D2000 (km s<SUP>-1</SUP>)</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>Sign convention: the result is positive when the LSR
is receding from the given point on the sky.
<DT>2.
<DD>The Local Standard of Rest used here is a point in the
vicinity of the Sun which is in a circular orbit around
the Galactic centre. Sometimes called the <I>dynamical</I> LSR,
it is not to be confused with a <I>kinematical</I> LSR, which
is the mean standard of rest of star catalogues or stellar
populations.
<DT>3.
<DD>The dynamical LSR velocity due to Galactic rotation is assumed to
be 220 km s<SUP>-1</SUP> towards <IMG WIDTH="64" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="img222.gif"
ALT="$l^{I\!I}=90^{\circ}$">, <IMG WIDTH="51" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="img223.gif"
ALT="$b^{I\!I}=0$">. </DL></DL>
<P> <DL>
<DT><STRONG>REFERENCE:</STRONG>
<DD>Kerr & Lynden-Bell (1986), MNRAS, 221, p1023.
</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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