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/node119.html | 188 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 188 insertions(+) create mode 100644 src/slalib/sun67.htx/node119.html (limited to 'src/slalib/sun67.htx/node119.html') diff --git a/src/slalib/sun67.htx/node119.html b/src/slalib/sun67.htx/node119.html new file mode 100644 index 0000000..9133db9 --- /dev/null +++ b/src/slalib/sun67.htx/node119.html @@ -0,0 +1,188 @@ + + + + +SLA_H2FK5 - Hipparcos to FK5 + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_HFK5Z - Hipparcos to FK5, no P.M. +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_H2E - Az,El to +

+

+

SLA_H2FK5 - Hipparcos to FK5 +   +

+
+
ACTION: +
Transform a Hipparcos star position and proper motion +into the FK5 (J2000) frame. +

CALL: +
CALL sla_H2FK5 (RH,DH,DRH,DDH,R5,D5,DR5,DD5) +

+

+
GIVEN: +
+
+ + + + + + + + + + + + + + + + + +
RHDHipparcos $\alpha$ (radians)
DHDHipparcos $\delta$ (radians)
DRHDHipparcos proper motion in $\alpha$(radians per Julian year)
DDHDHipparcos proper motion in $\delta$(radians per Julian year)
+

+
RETURNED: +
+
+ + + + + + + + + + + + + + + + + +
R5DJ2000.0 FK5 $\alpha$ (radians)
D5DJ2000.0 FK5 $\delta$ (radians)
DR5DJ2000.0 FK5 proper motion in $\alpha$(radians per Julian year)
DD5DFK5 J2000.0 proper motion in $\delta$(radians per Julian year)
+

+
NOTES: +
+
1. +
The $\alpha$ proper motions are $\dot{\alpha}$ rather than +$\dot{\alpha}\cos\delta$, and are per year rather than per century. +
2. +
The FK5 to Hipparcos + transformation consists of a pure rotation and spin; + zonal errors in the FK5 catalogue are not taken into account. +
3. +
The adopted epoch J2000.0 FK5 to Hipparcos orientation and spin + values are as follows (see reference): +


+
+
+

             + + + + + + + + + + + + + + + + + + + + + +
 orientation   spin   
x-19.9     -0.30  
y-9.1     +0.60  
z+22.9     +0.70  
 mas      mas/y 
+


+
+
+
+

+These orientation and spin components are interpreted as + axial vectors. An axial vector points at the pole of + the rotation and its length is the amount of rotation in radians. +

4. +
See also sla_FK52H, sla_FK5HZ, sla_HFK5Z. +
+

+
REFERENCE: +
Feissel, M. & Mignard, F., 1998., Astron.Astrophys. 331, L33-L36. +
+
+ +next + +up + +previous +
+ Next: SLA_HFK5Z - Hipparcos to FK5, no P.M. +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_H2E - Az,El to +

+

+

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