GNS SPK files.
===========================================================================
 
     This ``aareadme.txt'' file describes contents of the kernels/spk
     directory of the GNS SPICE data server. It was last modified on May
     22, 2009. Contact Chuck Acton (818-354-3869, Chuck.Acton@jpl.nasa.gov)
     or Boris Semenov (818-354-8136, Boris.Semenov@jpl.nasa.gov) if you
     have any questions regarding this data.
 
 
Brief summary
--------------------------------------------------------
 
     This directory contains the SPICE SP-Kernel files for the GNS
     spacecraft. All files are in IEEE binary format and suitable for ftp
     binary transfer to use on UNIX workstations and MACs. The following
     files are present in this directory. (Only file names are shown; the
     file name extensions of the binary SPK files are always ".bsp"):
 
     Merged Spacecraft Trajectory SPK files:
 
           gns_010811_041125_101231   is a merged SPK file created by
                                      merging regular reconstructed OD
                                      solution SPK files during the mission
                                      with the post primary mission
                                      predicted SPK file. This file covers
                                      the whole primary mission -- from
                                      three days after launch on August 8,
                                      2001 to Earth return on September 8,
                                      2004 -- and extends beyond it to
                                      December 31, 2010
 
     Planetary Ephemeris SPK files:
 
           de405s                     is a DE405 planetary ephemeris SPK
                                      file providing data for the Sun,
                                      Earth, Moon, and planet barycenters.
 
 
SPK File Naming Schema.
--------------------------------------------------------
 
     The subsections below describe SPK files naming schemes.
 
 
Spacecraft Trajectory SPK files.
 
     The naming scheme for these files is:
 
        gns_YYMMDD_yymmdd_YYMMDD
 
     where
 
           YYMMDD   are the file coverage begin and end dates;
 
           yymmdd   is end date of the reconstructed trajectory portion of
                    the file;
 
 
Metainformation Files
--------------------------------------------------------
 
     A few types of files containing metainformation may present in this
     directory. They are described in this section.
 
 
SPK Label Files.
 
     Detached label files have the same names as the corresponding SPK
     files with the additional extension ".lbl" appended at the end.
 
     For the merged products created by NAIF, the label contains more
     structured and organized information including detailed description of
     the data sources, the way the file was created, etc.