THRDRG

AUG 1998

9808.0

ARC SET

----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
THRDRG           7603901                                                        
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT         DESCRIPTION                         DEFAULT VALUE & UNITS
                                                                                
1-6     A6             THRDRG - Requests thermal drag                           
                       application.                                             
                                                                                
7                      Card number indicator (1 or 2).           1              
                       The second card is used to request    
                       adjustment of the satellite spin
                       axis. 
                                                                                
8       I1             > 0 Indicates that partials are        0              
                       to be calculated but the thermal                         
                       drag force will not be applied.                          
                                                                                
18-24   I7             Satellite ID (Required)                   0              
                                                                                
25-44   D20.8          Scaling parameter D                -11.836**-12  MS**-2  
                       (see model below)

45-59   D15.3          Model variable parameter                 1.2
                       (see model description below)                    unitless
   		 		                     
60-72   D13.1 	       Colatitude of the satellite's          22 DEG  
                       spin axis 
                       If there is a 2 in column 7 
                       (if this is the second THRDRG 
                       card), then this field is for
                       the standard deviation of the  
                       a priori spin axis colatitude.
                       The default standard deviation
                       is zero.

73-80   D8.2           The right ascension of the            313 DEG  
                       satellite's spin axis 
                       If there is a 2 in column 7 (if 
                       this is the second THRDRG card),
                       then this field is for the
                       standard deviation of the a priori
                       spin axis right ascencion. The
                       default standard deviation is zero. 
                                                                                
Note [1]:  The option to adjust the spin axis will not work in a run with       
	          more than one satellite or more than one arc.                        
                                                                                
Note [2]:  The thermal drag acceleration is computed from the equation          
           (for detailed description see section 8.12, Vol. 1)  :


                              




UNITS:  KM =Kilometers; M  =Meters    ; S  =Seconds    ; M/S=Meters per second  
        DEG=Degrees   ; RAD=Radians   ; AS =Arc seconds; MAS=Milli-arc seconds  
                                                                                



IF CARD OMITTED : Thermal drag acceleration will not be included.