PLANOR

----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
PLANOR                                                                          
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT         DESCRIPTION                         DEFAULT VALUE & UNITS
										
1-6     A6     PLANOR - Introduces modification and/or 
               estimation of planetary orientation parameters:
               All the parameters below are evaluated and
               input at J2000. [NOTE 2]

                = right ascension

               d/dt = right ascension rate

                = declination

               d/dt = declination rate

               g = prime meridian

               dg/dt = prime meridian rate

               d2g/dt2 = prime meridian acceleration

               Ai = Coefficient to costi term.

               Bi = Coefficient to sinti term.

                   i = 1, # of periodic terms


               A blank PLANOR card will cause all the above
               parameters to be adjusted with sigma =
               1.D0.  The first seven plus two periodic
               terms initial values for the above
               parameters are taken from the IAU Reports.
               Presently in GEODYN values from the 1988
               IAU report are used. Also in the case of
               Venus, the user may choose to use the 1988
               or the 1991 values (Look at the PLANET card
               documentation) The PLANOR card however
               allows the user to modify the values of any
               of the above parameters and estimate only
               selected parameters with the with the help
               of the following index on col. 7.
                                                                                

 7      I1     Index that allows estimation and modification
               of selected parameters.

               =1 right ascension

               =2 right ascension rate

               =3 declination

               =4 declination rate

               =5 prime meridian

               =6 prime meridian rate

               =7 prime meridian acceleration

               =8 Coefficient to costi term

               =9 Coefficient to sinti term 


COLUMNS FORMAT         DESCRIPTION                         DEFAULT VALUE & UNITS

               PLANOR8 and PLANOR9 in consecutive pairs
               may be repeated as many times as the number
               of periodic terms. More than one paramter
               may be selected and modifeid. When a paramter
               is selected (PLANOR1) then a value for this
               paramter may be specified on cols. 60-72 and a
               sigma may be specified on cols. 73-80. In this
               case all the other planetary orientation
               parameters will be fixed using a sigma = 1.D-20.


19-24   I6     Reference epoch for planetary orientation     Jan 1,2000
               parameters (YYMMDD) Only one reference 
               epoch applies to all planetary orientation
               parameters.  It may be specified on the
               first PLANOR card in the setup.


25-44  D20.8   Period in earth seconds must be included      59355072 sec.
               on every PLANOR8 card                         (1 Mars period in
                                                              Earth seconds.)


60-72  D13.1   Value of parameter specified by index on      GEODYN
               col. 7.                                       defaults



                = degrees

               d/dt = degrees/Julian centuries of 36525 days

                = degrees

               d/dt = degrees/Julian centuries of 36525 days

               g = degrees

               dg/dt = degrees/day

               d2g/dt2 = degrees/day2

	       Ai = degrees

	       Bi = degrees



73-80  D8.2    Sigma of parameter specified by index on
               col. 7. [NOTE 1]




NOTE[1]:  When planetary orientation parameters are adjusted, the GEODYN output
          summary expresses them in the frame and units of adjustment.  This
          is degrees of epoch J2000 and degrees/seconds for the rates.

NOTE[2]:  In GEODYN version 9708, the above option works for all planets. The 
          PLANOR option does not work properly for the moon.

AUG 1997

9708.0

GLOBAL SET