INTEGRAL CK files
===========================================================================

     This ``aareadme.txt'' file describes the contents of the kernels/ck
     directory of the INTEGRAL SPICE data server.

     It was last modified on February 25th, 2021 by Alfredo
     Escalante Lopez, ESAC/ESA.


Contact Information
--------------------------------------------------------
 
     If you have any questions regarding this directory or its
     contents, please contact SPICE support at ESAC:

             Alfredo Escalante Lopez
             (+34) 91-8131-429
             spice@sciops.esa.int
 
     or NAIF at JPL:
  
             Boris Semenov
             (818) 354-8136
             Boris.Semenov@jpl.nasa.gov

           
References and required readings
--------------------------------------------------------

     1. ``Frames Required Reading'', NAIF Document
 
     2. ``C-Kernel Required Reading'', NAIF Document

     3. ``SCLK Required Reading'', NAIF Document
 
     4. ``TIME Required Reading'', NAIF Document

          
Brief Summary
--------------------------------------------------------

     This directory contains the SPICE C-Kernel files for the INTEGRAL
     spacecraft, its structures, and science instruments. Particularly,
     it contains data for the following INTEGRAL frames:
   
          Frame Name             Relative to            NAIF ID
         ---------------------  -------------------    ---------
          INTEGRAL_SPACECRAFT    J2000                  -999000


File naming conventions
--------------------------------------------------------

   INTEGRAL spacecraft CK:
 
      The naming scheme for the INTEGRAL spacecraft CK is:
   
           integral_INST_TYPE[_ID][_DESC]_YYYYMMDD_YYYYMMDD_SCLK_vNN.bc

      where

           INST     instrument/structure/sensor identifier (required):
         
                       sc: for the integral spacecraft frame;

           TYPE      Data type, where a reference to the originator of the
                     data, the type of data and the reference period is
                     provided. This is a three letter acronym. The first
                     letter defines the file originator:
                    
                          s: Science Operations Center;
                          m: Mission Analysis;
                          f: Flight Dynamics;
                    
                     the second letter indicates the reference period of the
                     data:
                          
                          a: Full mission reference;
                          c: Cruise phase reference;
                          l: Long term reference;
                          m: Medium term reference;
                          s: Short term reference;
                          v: Very Short term reference;
                          o: Undefined reference;

                     the third letter defines the type of data:
                     
                          p: Predicted data;
                          m: Measured data;
                          r: Reconstructed data;
                          t: Test data;
                    
           ID        mapping to the original file product IDs as defined per
                     an ICD document (optional);
           
           DESC      description of the original reference file of any
                     particular of the original file (optional);
      
           YYYYMMDD  coverage start and stop times in TDB (required);
                 
           SCLK      reference to SCLK used to created the CK (required):
      
                         sYYYYMMDD: SCLK version YYYYMMDD for type ``step''
                         tYYYYMMDD: SCLK version YYYYMMDD for type ``stretch''    
                         fYYYYMMDD: SCLK version YYYYMMDD for type ``fictional''
                    
           NN        CK version number -- 2 digits (required).


      See [5] for further details on the SCLK types available to INTEGRAL.
         
   If multiple versions of a C-Kernel file are provided, always use the latest 
   version (unless earlier version is needed for some special reasons.)
   

Other directory contents
--------------------------------------------------------

     aareadme.txt         This file.

   
Kernel File Details
--------------------------------------------------------
   
     The most detailed description of the data in a binary CK file is
     provided in metadata included inside the comment area of the file.
     This information can be viewed using the utility programs COMMNT and
     SPACIT included in the NAIF Toolkit.


End of aareadme file.