PHSRM SPK Files
===========================================================================

   This file was last modified on October 07, 2011 by A. Ledkov


Summary
--------------------------------------------------------

   This "aareadme_en.txt" file describes the contents of the "kernels/spk"
   directory of the PHSRM SPICE data server. It also provides the file
   naming conventions used for the PHSRM SPK kernels, instructions for
   getting additional information about an SPK file, and contact
   information for PHSRM SPK producers.


Directory Contents
--------------------------------------------------------

   This directory contains the following files and subdirectories:
   
    phsrm_111108_111108_111109_nom3.bsp   SPK files containing nominal
    phsrm_111109_111109_120910_nom3.bsp   PHSRM spacecraft trajectory 	
                                          data provided by Laspace in
                                          October 2011, covering transfer 
                                          from baseline orbit of Earth to
                                          cruise Earth-Mars, cruise
                                          from Earth to Mars
                                          
    phsrm_120911_120911_120921_nom2.bsp   SPK files containing nominal 	
    phsrm_120921_120921_120930_nom2.bsp   PHSRM spacecraft trajectory 
    phsrm_120930_120930_121008_nom.2bsp   data provided by KIAM in 
    phsrm_121008_121008_130114_nom2.bsp   January 2011, covering  
    phsrm_130114_130114_130114_nom2.bsp   three-day orbit around Mars
    phsrm_130114_130114_130214_nom2.bsp   before separation, three-day
                                          orbit around Mars after
                                          separation, transfer to 
                                          observation orbit around Mars,
                                          observation orbit around Mars,
                                          transfer to quasi synchronous
                                          orbit around Mars and quasi
                                          synchronous orbit around Mars
                                          
    de421.bsp                             SPK file containing JPL DE421
                                          planetary ephemeris data for
                                          planet barycenters, and for the
                                          sun, earth and moon mass
                                          centers, for the entire mission.

    mar085.bsp                            SPK file containing JPL MAR085
                                          martian satellite ephemeris data
                                          for Phobos and Deimos, for the
                                          entire mission. Note that this
                                          is the baseline kernel used for
                                          planning.

    phobos_kiam_101231_v00.bsp            SPK file contaning Phobos orbit 
                                          produced by KIAM

    earthstns_phsrm_itrf93_110118.bsp     SPK file for the ground 
                                          stations Russian Deep 
                                          Space Network (RDSN) stations.

    former_versions                       Subdirectory containing obsolete
                                          versions of the SPK files and
                                          other files used for creating
                                          SPK.

    aareadme_en.txt                       This file.

    aareadme_ru.txt                       This file in Russian.


File Naming Conventions
--------------------------------------------------------

   The PHSRM spacecraft trajectory SPKs provided in this directory are
   named as follows

      phsrm_YYMMDD_YYMMDD_YYMMDD[_NOTE][_vNN].bsp

   where 

      YYMMDD are the coverage start time, reconstructed part
      end date, and coverage end date

      _NOTE is the optional note (e.g. _test1)

      _vNN is the optional version (e.g _v00, _v01)


   The JPL planetary ephemeris SPKs provided in this directory are
   named as follows

      deNNN.bsp

   where 

      NNN is the JPL planetary ephemeris version (e.g. 421)


   The JPL satellite ephemeris SPKs provided in this directory are
   named as follows

      marNNN.bsp

   where 

      NNN is the JPL martian ephemeris version (e.g. 080)

   
   The PHOBOS ephemeris SPKs created by organizations other than JPL
   provided in this directory are named as follows

      phobos_PROD_YYMMDD[_vNN].bsp

   where 

      PROD is the producer name or acronym (e.g. kiam)

      YYMMDD is the release date

      _vNN is the optional version; usually omitted 


   The PHSRM spacecraft structures SPK provided in this directory are
   named as follows

      phsrm_struct_vNN.bsp

   where 

      NN is the version number (e.g. 00, 01, 02, etc)

   The ground stations SPKs provided in this directory are named as 
   follows:

      earthstns_phsrm_itrf93_YYMMDD.bsp

   where

      YYMMDD is the release date.


Getting Additional Information About an SPK File
--------------------------------------------------------

   The contents and time span covered by any SPK file may be easily
   determined using the "brief" utility program available in all copies
   of the SPICE Toolkit. Example of usage:

      $ brief  <spk_file_name>

   Descriptive information about how/why/when an SPK file was created
   is usually available in the "comment area" of the file. This may be
   viewed using the "commnt" utility program available in all copies of
   the SPICE Toolkit. Use the "-r" option to read the comments.
   Example:

      $ commnt -r <spk_file_name>
 

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

   If you have any questions about PHSRM SPK files, contact

      A. Ledkov / IKI              aledkov@iki.rssi.ru
      A. Yanin  / NPO Lavochkina   yanin@laspace.ru
      A. Tuchin / IPM              tag@kiam1.rssi.ru


End of aareadme_en.txt