ExoMars2016 SPK files
===========================================================================

   This ``aareadme.txt'' file describes the contents of the kernels/spk
   directory of the ExoMars 2016 SPICE Kernel Dataset.

   It was last modified on May 7, 2020 by Marc Costa Sitja, ESAC/ESA.


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

   This directory contains the SPICE SP-Kernel files for the ExoMars 2016
   mission, including mission analysis, nominal and operational spacecraft
   trajectory SPKs, generic planetary and satellite ephemeris SPKs.

    """THIS IS JUST SOME TEXT ADDED TO FORCE DIFFERENCES IN AREADME FILE
    COMPARED WITH PREVIOUS BUNDLE AREADME"""

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

   Naming Scheme for ExoMars 2016 spacecraft SPKs:

     The naming scheme for the ExoMars 2016 spacecraft trajectory SPKs is:

           em16_SC_TYPE[_ID][_DESC]_YYYYMMDD_YYYYMMDD_vNN.bsp

     where

           SC        accronym of the spacecraft:

                          tgo: for the Trace Gas Orbiter (TGO) spacecraft;
                          edm: for the Schiaparelli (EDM) lander;

           TYPE      Data type, where a reference to the originator of the
                     data, the type of data and the 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 defines the reference period of the
                     data:

                          c: Cruise phase reference;
                          p: Pre-aerobraking phase reference;
                          a: Aerobraking phase reference;
                          l: Science phase Long term reference;
                          m: Science phase Medium term reference;
                          s: Science phase Short term reference;
                          o: Undefined reference;

                     the third letter indicates the type of data

                          p: Predicted and often reconstructed data;
                          r: Reconstructed data;
                          t: Test data;

           ID        mapping to the original file product IDs as defined
                     per an ICD document (optional);

           DESC      free text description of any particular aspect of the
                     data (optional);

           YYYYMMDD  coverage start and stop times in TDB (required);

           NN        version number, starting from 01 (required; e.g. 01);


     The naming scheme for the ExoMars 2016 spacecraft center-of-gravity
     SPKs is:

            em16_SC_cog[_ID][_YYYYMMDD_YYYYMMDD]_vNN.bsp

     where

           SC        accronym of the spacecraft:

                          tgo: for the Trace Gas Orbiter (TGO) spacecraft;
                          edm: for the Schiaparelli (EDM) lander;

           ID        mapping to the original file product IDs as defined
                     per an ICD document (optional);

           YYYYMMDD  coverage start and stop times in TDB (optional);

           NN        version number, starting from 01 (required; e.g. 01);


     The naming scheme for the ExoMars 2016 spacecraft structures SPKs is:

           em16_SC_structures_vNN.bsp

     where

           SC        accronym of the spacecraft:

                          tgo: for the Trace Gas Orbiter (TGO) spacecraft;
                          edm: for the Schiaparelli (EDM) lander;

           NN        version number, starting from 01 (required; e.g. 01);


   Naming Scheme for Generic Planetary Ephemeris SPKs

     The naming scheme for generic planetary SPKs is:

           deNNN.bsp

     where

           NNN       DE version (required; e.g. 421);


   Naming Scheme for Generic Mars Satellite Ephemeris SPKs

     The naming scheme for generic mars satellite SPKs is:

           marNNN[_EXTRA].bsp

     where

           NNN       satellite ephemeris number (required; e.g. 083);

           EXTRA     additional information token (optional);


   Naming Scheme for Generic Outer Planets Ephemeris SPKs

     The naming scheme for generic mars satellite SPKs is:

           outerplanets_vNNNN.BSP

     where

           NNNN      version (required; e.g. 0004);


   Naming Scheme for ESA ESTRACK ground stations SPKs

     The naming scheme for ESA ESTRACK ground stations SPKs is:

           estrack_vNN.bsp

     where

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


   Naming Scheme for ESA New Norcia ground station SPKs

     The naming scheme for ESA New Norcia ground stations SPKs is:

           new_norcia.bsp


Current SPK Kernels Set
--------------------------------------------------------

   em16_tgo_fsp_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains TGO spacecraft operational Mars centric
      ephemeris for the science phase. This file contains both reconstructed
      and predicted data. The predicted data typically starts around 22:00 and
      23:59 CET of the day before the source file was provided by Flight
      Dynamics (which is the SPK generation date). This file should be
      considered final for the data period it covers and should be used for
      data analysis. Please note that SPICE Toolkit Version N66 or higher
      is required to use the latest versions of these SPKs.
      Created by the ESA SPICE Service (ESS).


   em16_tgo_flp_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains TGO spacecraft long term planning
      operational Mars centric ephemeris for the science phase. This file
      contains only predicted data. This files are used for Long and Medium
      term planning purposes. Created by the ESA SPICE Service (ESS).


   em16_tgo_fap_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains TGO spacecraft operational Mars centric
      ephemeris for the aerobraking phase. This file contains both
      reconstructed and predicted data. The predicted data typically starts
      around 22:00 and 23:59 CET of the day before the source file was
      provided by Flight Dynamics (which is the SPK generation date). This
      file should be considered final for the data period it covers.
      Created by the ESA SPICE Service (ESS).


   em16_tgo_fpp_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains TGO spacecraft operational Mars centric
      ephemeris for the pre-aerobraking phase. This file contains both
      reconstructed and predicted data. This files should be considered final
      for the data period it covers. Created by the ESA SPICE Service (ESS).


   em16_tgo_fcp_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains TGO spacecraft operational Sun centric
      ephemeris for the Cruise and Near-Earth Commissioning phases. This files
      contain both reconstructed and predicted data. This files should be
      considered final for the data period it covers.
      Created by the ESA SPICE Service (ESS).


   em16_tgo_struct_vNN.bsp

      SPICE SPK file that contains TGO spacecraft structures positions that
      apply during all the mission. Created by the ESA SPICE Service (ESS).


   em16_tgo_cog_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains TGO spacecraft center-of-gravity (CoG)
      history. It is important to note that the TGO trajectory SPK files
      provide ephemeris information for TGO (-143) and refer to the CoG.
      This file provides provides the position of TGO_SPACECRAFT.
      Created by the ESA SPICE Service (ESS).


   em16_edm_fpd_NNN_NN_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains EDM lander operational Mars centric
      ephemeris as provided by Flight Dynamics.


   em16_edm_sot_landing_site_YYYYMMDD_YYYYMMDD_vVV.bsp

      SPICE SPK file that contains EDM lander landing site Mars centric
      ephemeris.


   de432s.bsp

      SPICE SPK file containing JPL planetary ephemerides version DE432,
      created by NAIF, JPL.


   mar097_YYYYMMDD_YYYYMMDD.bsp

      SPICE SPK file containing JPL Martian satellite ephemerides version
      MAR097, created by NAIF, JPL.


   estrack_vNN.bsp

      SPICE SPK file that defines the position for each of the ESA ESTRACK
      ground stations, as seen from the center of the Earth, in the
      topocentric frame defined in the corresponding ESTRACK FK.


   new_norcia.bsp

      SPICE SPK file that defines the position of the ESA New Norcia
      ground station, as seen from the center of the Earth, in the
      topocentric frame defined in the corresponding New Norcia FK.


   outerplanets_vNNNN.bsp

      SPICE SPK file that contains information (predicted) for the outer
      planets of the solar system: Jupiter, Saturn, Uranus and Neptune.
      It is meant to complement de432s.bsp, which contains information for
      their barycenters, but not the bodies themselves. This file is
      generated after several ephemeris files created by NAIF, JPL.


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

   aareadme.txt         This file.


Particulars
--------------------------------------------------------

     Nothing to report.


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

     The most detailed description of the data in a binary SPK 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.


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

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

           Marc Costa Sitja
           (+34) 91-8131-457
           esa_spice@sciops.esa.int, marc.costa@esa.int

     or SPICE support at IKI:

             Alexander Abbakumov
             +7 (495) 333-40-13
             aabbakumov@romance.iki.rssi.ru

   or NAIF at JPL:

           Boris Semenov
           +1 (818) 354-8136
           Boris.Semenov@jpl.nasa.gov


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

     1. ``SPK Required Reading'', NAIF Document


End of aareadme file.
