Differences between revisions 13 and 18 (spanning 5 versions)

pole

Category B

Version 3.0

Description

This program solves for the pole right ascension, declination and rotation rate for a body in principal axis rotation. The rotation rate is calculated in degrees/day while right ascension and declination are calculated in degrees.

Input Files

POLE.TXT - simple text file containing nominal pole RA (deg), DEC (deg), PM (deg), OMEGA (deg/day)
LMRKLIST.TXT - list of landmarks

$/!\$ POLE.TXT and LMRKLIST.TXT must be in the working directory.

POLE.TXT is a single row file that contains the predicted pole RA (deg), DEC (deg), PM (deg), and OMEGA (deg/day). These values are given in the .tpc kernel file for the object. LMRKLIST.TXT contains a list of landmarks.

Using pole

1. Input a time in UTC.

$/!\$ Make sure the time is within the span supported by the kernels.

2018 NOV 16 13:09:54.824

2. Create a POLE.TXT file.

Here is a sample POLE.TXT file:

       86         -65      89.00000000    2010.48945

3. Answer whether you want the rotation rate fixed (y for yes, n for no).

4. Enter

0 if you want to iterate
1 if you want to keep the result (this updates POLE.TXT)
2 if you want the previous result (this is nominal if on the first iteration)

Here is a sample output from the POLE.TXT input:

    86.60062   -65.00002    90.42707  2009.99979311
     0.05176     0.02171                 0.00000001

The first row gives all the new pole parameters for POLE.TXT. The second row shows the change.

================= Testing using the NTE3A data set showed that picking different Epoch times over the time span of the images used (in this case 22 days) resulted in no change of RA, DEC, or rotation rate, and the PM at J2000 only change by 0.07 deg.

(Compiled by KD)

CategoryPrograms

-  ⇤ ← Revision 13 as of 2016-02-01 10:54:24 → 
  Size: 1625
  Editor: BMittan
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+   ← Revision 18 as of 2018-04-09 15:17:30 → ⇥
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  Editor: JohnWeirich
  Comment:
-Deletions are marked like this.
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+||Category B||Version 3.0||
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-. Input a time in UTC.
 . /!\ Make sure the time is within the span supported by the kernels.
+=== 1. Input a time in UTC. ===
  /!\ Make sure the time is within the span supported by the kernels.
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+Line 26:
-.#2 Create a POLE.TXT file.
+=== 2. Create a POLE.TXT file. ===
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+Line 28:
-Sample POLE.TXT file:
+Here is a sample POLE.TXT file:
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+Line 33:
-.#3 Answer whether you want the rotation rate fixed (y for yes, n for no).
+=== 3. Answer whether you want the rotation rate fixed (y for yes, n for no). ===
-Line 33:
+Line 35:
-.#4 Enter 
  * 0 if you want to iterate
  * 1 if you want to keep the result (this updates POLE.TXT)
  * 2 if you want the previous result (this is nominal if on the first iteration)
+=== 4. Enter ===

  * '''0''' if you want to iterate
  * '''1''' if you want to keep the result (this updates POLE.TXT)
  * '''2''' if you want the previous result (this is nominal if on the first iteration)
-Line 39:
+Line 42:
- * {{{
+{{{
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+Line 49:
+=================
Testing using the NTE3A data set showed that picking different Epoch times over the time span of the images used (in this case 22 days) resulted in no change of RA, DEC, or rotation rate, and the PM at J2000 only change by 0.07 deg.