JUICE PCK files
==============================================================================

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

   It was last modified on May 21, 2024 by Rafael Andres Blasco, ESAC/ESA.


Contact Information
-----------------------------------------------------------------------------

   If you have any questions regarding this file contact the
   ESA SPICE Service (ESS) at ESAC:

           Alfredo Escalante Lopez
           (+34) 91-8131-429
           spice@sciops.esa.int

   or the JUICE Science Operations Center at ESAC:

           Marc Costa Sitja
           (+34) 646-746-711
           Marc.Costa@ext.esa.int

   or NAIF at JPL:
 
           Boris Semenov
           (818) 354-8136
           Boris.Semenov@jpl.nasa.gov


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

   1. ``PCK Required Reading'', NAIF

   2. ``NAIF Integer ID Codes Required Reading'', NAIF

   3. ``INPOP19a planetary ephemerides'', Notes Scientifiques et Techniques de
      l'Institut de mécanique céleste, #109, ISBN 978-2-910015-81-7, 35 pages
      December 2019


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

   This directory contains generic and mission-specific SPICE Planetary
   Constants Kernel files for the JUICE mission. The data in these kernels
   correspond to the best knowledge of the orientation, size and shape
   of each of the JUICE targets and is released upon authorization by the
   JUICE Science Team.


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

   Naming Scheme for Generic PCKs

      The naming scheme for generic PCKs is:

         pckNNNNN.tpc

      where

         NNNNN    version number (required)(e.g. 00010);

                  If multiple versions of a generic PCK Kernel file are
                  provided, always use the latest version (unless an
                  earlier version is needed for some special reasons.)


      The naming scheme for generic PCK containing masses for Solar System
      bodies is:

         de-NNN-masses.tpc

      where

           NNN    planetary ephemeris version number (required; e.g. 403);

                  If multiple versions of a generic PCK Kernel file are
                  provided, always use the latest version (unless an
                  earlier version is needed for some special reasons.)


      The naming scheme for generic PCK mass parameters to planets & satellites
      bodies is:

         gm_deNNN.tpc

      where

           NNN    planetary ephemeris version number (required; e.g. 403);

                  If multiple versions of a generic PCK Kernel file are
                  provided, always use the latest version (unless an
                  earlier version is needed for some special reasons.)


   Naming Scheme for JUICE mission-specific PCKs

      The naming scheme for the Jupiter system natural satellites under 
      study in JUICE PCKs is:

         juice_jupNNN.tpc

      where

         NNN      version number (required) (e.g. 000);

                  If multiple versions of a JUICE mission-specific PCK
                  Kernel file are provided, always use the latest version
                  (unless an earlier version is needed for some special
                  reasons.)


      The naming scheme for the Regions of Interest under study in JUICE 
      PCKs is:

         juice_roi_vNN.tpc

      where

         NN       version number (required) (e.g. 01);

                  If multiple versions of a JUICE mission-specific PCK
                  Kernel file are provided, always use the latest version
                  (unless an earlier version is needed for some special
                  reasons.)


   Naming Scheme for Earth PCKs

     The naming scheme for the Earth high-precision PCKs is:

           earth_SDAT_EDAT_PDAT.bpc

     where

           SDAT     is the file's coverage start time in YYMMDD format;
           
           EDAT     is the file's coverage end time in YYMMDD format;
           
           PDAT     is the date from which the information contained
                    in the file corresponds to predicted data. Any data
                    prior to this date corresponds to actual measurements.


     The naming scheme for the Low accuracy, long term predict earth PCK is:

           earth_SDAT_EDAT_predict.bpc

     where

           SDAT     is the file's coverage start time in YYMMDD format;
           
           EDAT     is the file's coverage end time in YYMMDD format;


   Naming Scheme for the Moon PCKs

     The naming scheme for the Moon INPOP19a[3] ephemerides PCKs is:

           inpop19a_moon_pa_vNN.bpc

     where

         NN       version number (required) (e.g. 01);

                  If multiple versions of a JUICE mission-specific PCK
                  Kernel file are provided, always use the latest version
                  (unless an earlier version is needed for some special
                  reasons.)


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

   aareadme.txt         This file.

   former_versions      Directory where versions no longer valid are
                        stored for archive purposes.


Particulars
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   Nothing to report.


Kernel File Details
-----------------------------------------------------------------------------

   The most detailed description of the data in a PCK file is provided
   in metadata included inside the descriptive text areas of the file.
   This information can be viewed using any text editor.


End of aareadme file.