From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 4 Mar 2015 21:21:30 -0500 Subject: Initial commit --- src/slalib/sun67.htx/node171.html | 115 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 src/slalib/sun67.htx/node171.html (limited to 'src/slalib/sun67.htx/node171.html') diff --git a/src/slalib/sun67.htx/node171.html b/src/slalib/sun67.htx/node171.html new file mode 100644 index 0000000..307d861 --- /dev/null +++ b/src/slalib/sun67.htx/node171.html @@ -0,0 +1,115 @@ + + + + +SLA_RVGALC - RV Corrn to Galactic Centre + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_RVLG - RV Corrn to Local Group +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_RVEROT - RV Corrn to Earth Centre +

+

+

SLA_RVGALC - RV Corrn to Galactic Centre +   +

+
+
ACTION: +
Velocity component in a given direction due to the rotation +of the Galaxy. +

CALL: +
R = sla_RVGALC (R2000, D2000) +

+

+
GIVEN: +
+
+ + + + + +
R2000,D2000RJ2000.0 mean $[\,\alpha,\delta\,]$ (radians)
+

+
RETURNED: +
+
+ + + + + +
sla_RVGALCRComponent of dynamical LSR motion in direction +R2000,D2000 (km s-1)
+

+
NOTES: +
+
1. +
Sign convention: the result is positive when the LSR +is receding from the given point on the sky. +
2. +
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 dynamical LSR, + it is not to be confused with a kinematical LSR, which + is the mean standard of rest of star catalogues or stellar + populations. +
3. +
The dynamical LSR velocity due to Galactic rotation is assumed to + be 220 km s-1 towards $l^{I\!I}=90^{\circ}$, $b^{I\!I}=0$.
+

+
REFERENCE: +
Kerr & Lynden-Bell (1986), MNRAS, 221, p1023. +
+
+ +next + +up + +previous +
+ Next: SLA_RVLG - RV Corrn to Local Group +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_RVEROT - RV Corrn to Earth Centre +

+

+

+SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk +
+ + -- cgit