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/node173.html | 121 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 src/slalib/sun67.htx/node173.html (limited to 'src/slalib/sun67.htx/node173.html') diff --git a/src/slalib/sun67.htx/node173.html b/src/slalib/sun67.htx/node173.html new file mode 100644 index 0000000..2ae01da --- /dev/null +++ b/src/slalib/sun67.htx/node173.html @@ -0,0 +1,121 @@ + + + + +SLA_RVLSRD - RV Corrn to Dynamical LSR + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_RVLSRK - RV Corrn to Kinematical LSR +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_RVLG - RV Corrn to Local Group +

+

+

SLA_RVLSRD - RV Corrn to Dynamical LSR +   +

+
+
ACTION: +
Velocity component in a given direction due to the Sun's +motion with respect to the ``dynamical'' Local Standard of Rest. +

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

+

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

+
RETURNED: +
+
+ + + + + +
sla_RVLSRDRComponent of peculiar solar motion +in direction R2000,D2000 (km s-1)
+

+
NOTES: +
+
1. +
Sign convention: the result is positive when +the Sun is receding from the given point on the sky. +
2. +
The Local Standard of Rest used here is the dynamical LSR, + a point in the vicinity of the Sun which is in a circular + orbit around the Galactic centre. The Sun's motion with + respect to the dynamical LSR is called the peculiar solar + motion. +
3. +
There is another type of LSR, called a kinematical LSR. A + kinematical LSR is the mean standard of rest of specified star + catalogues or stellar populations, and several slightly + different kinematical LSRs are in use. The Sun's motion with + respect to an agreed kinematical LSR is known as the + standard solar motion. + The dynamical LSR is seldom used by observational astronomers, + who conventionally use a kinematical LSR such as the one implemented + in the routine sla_RVLSRK. +
4. +
The peculiar solar motion is from Delhaye (1965), in Stars + and Stellar Systems, vol 5, p73: in Galactic Cartesian + coordinates (+9,+12,+7) km s-1. + This corresponds to about 16.6 km s-1 + towards Galactic coordinates $l^{I\!I}=53^{\circ},b^{I\!I}=+25^{\circ}$.
+
+ +next + +up + +previous +
+ Next: SLA_RVLSRK - RV Corrn to Kinematical LSR +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_RVLG - RV Corrn to Local Group +

+

+

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