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     |   Welcome to the Phobos-Grunt SPICE ftp repository    |                 
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       This ftp site contains all the SPICE kernels generated for the PHobos 
       Soil Return Mission (PHSRM).       
        
                                                                  
 
      - Content of this directory                                             
        =========================                                             
                                                                              
        Each subdirectory within this directory contains all the kernels of   
        the same type that have been generated for the PHSRM.  
                                                                              
           ck:       Kernels that contain orientation for the spacecraft and  
                     some of its structures, (solar arrays, for instance).    
                                                                              
           ek:       Event kernels are not generated for PHSRM;        
                     therefore, this directory is empty.                      
                                                                              
           fk:       Kernels that define reference frames needed for the      
                     Mission.                                                 
                                                                              
           ik:       Kernels for the instruments on board the spacecraft.     
                                                                              
           lsk:      Leapseconds kernel.                                      
                                                     
           pck:      Kernels that define planetary constants.                 
                                                                              
           sclk:     Spacecraft clock coefficients kernels.                   
                                                                              
           spk:      Orbit kernels, for the spacecraft and other solar system 
                     bodies.                                                  
                                                                              
                                                                              
        Note that under each directory there is a subdirectory called         
        former_versions, that stores all kernels that have been superseded by 
        new kernels. You shouldn't use the kernels under these subdirectories.
                                                                              
                                                                              
                                                                              
      - PHSRM SPICE Kernel Naming Covention                                     
        =================================                                     
                                                                              
        Please refer to the aarreadme.txt in each of the subdirectories for   
        information on the naming convention for the specific type of kernels.
                                                                              
                                                                              
      - Usage of the SPICE Kernels for PHSRM.                          
        ============================================                           
                                                                              
        At least a basic knowledge of the SPICE system is needed in order to  
        use these kernels. The SPICE toolkit provides versions in Fortran     
        (SPICELIB), C (CSPICE), IDL (icy) and Matlab (mice), and the user can 
        choose any one that suits him/her.                                    
                                                                              
        The SPICELIB routine FURNSH, CSPICE function furnsh_c, and icy routine
        cspice_furnsh load a kernel file into the kernel pool as shown below. 
                                                                              
           CALL FURNSH  ( 'kernel_name' )                                     
           furnsh_c     ( "kernel_name" );                                    
           cspice_furnsh, 'kernel_name'                                       
           cspice_funsh( 'kernel_name' );                                     
                                                                              
        In the case when two or more files contain data overlapping in time   
        for a given object, for binary kernels, the file loaded last takes    
        precedence.                                                           
                                                                              
        If two (or more) text kernels assign value(s) using the '=' operator  
        to identical keywords, the data value(s) associated with the last     
        loaded occurrence of the keyword are used -all earlier values have    
        been replaced with the last loaded value(s).                          
                                                                              
                                                                              
-------------------                                                           
                                                                              
        This file was last modified on May 12th, 2010. (A. Ledkov)