pole

Description

The program pole solves 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 in degrees.

For pole to run, POLE.TXT and LMRKLIST.TXT are required in the working directory. LMRKLIST.TXT is just a file containing a list of landmarks and 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.

POLE.TXT Example

       86         -65      89.00000000    2010.48945

Input-Files

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

• LMRKLIST.TXT - list of landmarks

Input stdin

• A time in UTC (make sure it is within the span supported by the kernels)

2018 NOV 16 13:09:54.824

• determine whether you want the rotation rate fixed ( y for yes, n for no)

• 0 if you want to iterate, 1 if you want to keep result (updates POLE.TXT), 2 if you want previous result (nominal if on 1st iteration)

Output

•     86.60062   -65.00002    90.42707  2009.99979311
       0.05176     0.02171                 0.00000001

• first row our the new pole parameters for POLE.TXT while the second row is the change.