PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM

OBJECT                  = TEXT
   INTERCHANGE_FORMAT   = ASCII
   PUBLICATION_DATE     = 2007-02-20
   NOTE                 = "MGS SP-Kernel Information"
END_OBJECT              = TEXT
                                                                     
END 

General information about SPICE SP-kernels
==========================================

   The purpose of the SP-kernel -- which stands for S(pacecraft) and
   P(lanet) Kernel -- is to allow ephemerides for any collection of
   solar system bodies, spacecraft or any other objects in 3D space
   to be combined under a common file format, and accessed by a common
   set of subroutines.
   
   The SPK format is supported by a collection of subroutines that are
   part of the SPICELIB library or C functions that are part of the
   CSPICE library. These subroutines/functions can be integrated into
   user application programs. The SPICE system toolkit for a number of
   computer platforms or information regarding how it can be obtained
   is located in the "/software" subdirectory of the main directory of
   this data set.
   
   To use SP-kernels, a Leapseconds (LSK) is required.  Also, to use
   SP-Kernels containing positions given relative to the non-inertial
   and project-defined frames, a Frame Definitions (FRAMES) and
   Planetary Constants (PcK) files are required.
   
   Refer to the "spk.req" document provided with the toolkit or
   available from the NAIF Node of PDS if SPICE toolkit is not included
   with this data set to get more information on how to access
   SP-kernel data.


MGS SP-kernels provided on this volume
======================================

   The following MGS SP-kernels are provided on this volume (only name 
   portion of the file name is shown; the extension of all file names is
   ".bsp"):

   -- MGS Spacecraft Trajectory SPK files:

           mgs_[PHASE]                SPK files covering the whole or a
                                      portion of a particular phase of
                                      the mission, created by merging
                                      regular reconstructed OD solution
                                      SPK files from MGS NAV. Refer to
                                      the SPK coverage table provided
                                      below to find out coverage of a
                                      particular SPK file.

           mgs_[PHASE]_gsfc[_MODEL]   SPK files covering the whole or a
                                      portion of a particular phase of
                                      the mission, created by merging
                                      quick-look OD solution SPK files
                                      based on the "[_MODEL]" gravity
                                      model, from MOLA POD Team, GSFC.
                                      Refer to the SPK coverage table
                                      provided below to find out coverage
                                      of a particular SPK file.

           mgs_[PHASE]_ipng[_MODEL]   SPK files covering the whole or a
                                      portion of a particular phase of
                                      the mission, created by merging
                                      OD solution SPK files based on the
                                      "[_MODEL]" gravity model, from Inner
                                      Planet Navigation and Gravity group,
                                      JPL. Refer to the SPK coverage
                                      table provided below to find out
                                      coverage of a particular SPK file.

           mgs_50year_nominal         SPK file containing 50-year, post
                                      mission nominal trajectory
                                      generated the MGS NAV team.


   -- MGS Spacecraft Structures Fixed Offset SPK files:
   
           mgsstruct_hga              SPK file containing location of the 
                                      HGA structures with respect to each 
                                      other.
           
           mgsstruct_mager            SPK file containing location of the 
                                      MGA Solar Array structures and MAG 
                                      Sensors with respect to each other.
                                    

   -- Solar System Bodies Ephemeris data SPK file:
   
            mar033                    SPK file containing JPL's Mars 
                                      Satellite Ephemerides (MAR) MAR033.

            mar033_7                  SPK file containing JPL's Mars 
                                      Satellite Ephemerides (MAR) MAR033
                                      with longer coverage.

            mar063                    SPK file containing JPL's Mars 
                                      Satellite Ephemerides (MAR)
                                      MAR063. This file supersedes the
                                      MAR033 SPKs.
                                    
   All SPK files (except post-mission trajectory SPK(s)) provide actual
   (reconstructed) data.

   While the MGS NAV SPKs provide the most complete coverage, the most
   accurate trajectory solution is available in the latest SPKs
   produced by IPNG (version MGS95J). Therefore it is recommended that
   these two sets of files are loaded together with the IPNG MGS95J
   files loaded last to take priority.


MGS SPK Coverage Table
======================

   This table summarizes coverage of the MGS SPK files provided on this 
   volume:

           [PHASE]    Map.    Start      Stop    
            token    Cycles    Date      Date    
          --------- ------ ---------- ----------
            cru       ---   1996-11-23 1997-08-23
            ab1       ---   1997-09-13 1998-03-26
            spo1      ---   1998-03-26 1998-05-28
            spo2      ---   1998-05-28 1998-09-22
            ab2       ---   1998-09-23 1999-03-08
            map1      1-3   1999-03-09 1999-06-01
            map2      4-6   1999-06-02 1999-08-24
            map3      7-9   1999-08-25 1999-11-16
            map4     10-12  1999-11-17 2000-02-08
            map5     13-15  2000-02-09 2000-05-02
            map6     16-18  2000-05-03 2000-07-25
            map7     19-21  2000-07-26 2000-10-17
            map8     22-25  2000-10-18 2001-01-31
            ext1     25-27  2001-02-01 2001-04-03
            ext2     28-30  2001-04-04 2001-06-26
            ext3     31-33  2001-06-27 2001-09-18
            ext4     34-36  2001-09-19 2001-12-11
            ext5     37-39  2001-12-12 2002-03-05
            ext6     40-42  2002-03-06 2002-05-28
            ext7     43-45  2002-05-29 2002-08-20
            ext8     46-48  2002-08-21 2002-11-12
            ext9     49-51  2002-11-13 2003-02-04
            ext10    52-54  2003-02-05 2003-04-29
            ext11    55-57  2003-04-30 2003-07-22
            ext12    58-60  2003-07-23 2003-10-14
            ext13    61-63  2003-10-15 2004-01-06
            ext14    64-66  2004-01-07 2004-03-30
            ext15    67-69  2004-03-31 2004-06-22
            ext16    70-72  2004-06-23 2004-09-14
            ext17    73-75  2004-09-15 2004-12-07
            ext18    76-78  2004-12-08 2005-03-01
            ext19    79-81  2005-03-02 2005-05-25
            ext20    82-84  2005-05-26 2005-08-16
            ext21    85-87  2005-08-17 2005-11-08
            ext22    88-90  2005-11-09 2006-01-31
            ext23    91-93  2006-02-01 2006-04-25
            ext24    94-96  2006-04-26 2006-07-18
            ext25    97-99  2006-07-19 2006-10-10
            ext26      100  2006-10-11 2006-11-03
   
   
Kernel File Details
===================

   The most detailed description of the data in each SPK file is provided 
   in metadata included inside the comment area of the file. This 
   information can be viewed using utility programs COMMNT and SPACIT 
   included into the NAIF Toolkit.
   

Contact Information
===================

   Regarding MGS project specific information provided in this data set
   and for general information about SPICE system:
   
      Charles H. Acton, Jr, 
      (818)-354-3869, 
      Chuck.Acton@jpl.nasa.gov, 
      
   or 
   
      Boris Semenov 
      (818)-354-8136 
      Boris.Semenov@jpl.nasa.gov
      
   address:
   
      Navigation and Ancillary Information Facility (NAIF)
      Jet Propulsion Laboratory
      MS 301-125L
      4800 Oak Grove Drive
      Pasadena CA 91109 USA 

