ExoMars2016 FK files
===========================================================================

   This ``aareadme.txt'' file describes the contents of the kernels/fk
   directory of the ExoMars2016 SPICE Kernel Dataset.

   It was last modified on June 6, 2019 by Marc Costa Sitja, ESAC/ESA.


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

   This directory contains the SPICE Frames Definition Kernel files for the
   ExoMars 2016 TGO spacecraft, its structures, and science instruments, as
   well as for the Ground Earth Stations. Moreover, it contains frame
   definitions for science operations and for data analysis and scientific
   investigations.


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

   The following table provides information on which file contains which
   frames, their file naming conventions and some particular details:

      File                         Contents
     ---------------------------  -----------------------------------------
      earthfixediau.tf             Makes the IAU_EARTH coincide with
                                   the Earth fixed reference frame.

      estrack_vNN.tf               ESA Ground Stations topocentric frames.

      new_norcia_topo.tf           ESA New Norcia topocentric frame.

      earth_topo_050714.tf         NASA DSN Ground Stations topocentric
                                   frames.

      rssd0002.tf                  Cross-mission frames kernel that defines
                                   frames of interest not ``built'' in the
                                   SPICE toolkit.

      em16_tgo_ops_vNN.tf          ExoMars 2016 TGO science operations
                                   frames.

      em16_tgo_sc_mars_noa_vNN.tf  Mapping/overwrite of TGO_SPACECRAFT to
                                   TGO Mars Nadir-Orbit-Aligned frame.

      em16_tgo_sc_mars_npo_vNN.tf  Mapping/overwrite of TGO_SPACECRAFT to
                                   TGO Mars Nadir-Power-Optimized frame.

      em16_tgo_vNN.tf              ExoMars2016 TGO spacecraft, structures,
                                   instruments and sensors frames.

      em16_dsk_surfaces_vNN.tf     ExoMars2016 TGO Surface definitions for
                                   Digital Shape Kernels.

      em16_edm_vNN.tf              ExoMars2016 EDM lander, structures,
                                   instruments and sensors frames.

   where

           NN       version number -- two digits (required)

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


 Current FK Kernels Set
--------------------------------------------------------

  earthfixediau.tf

      SPICE FK file that makes the IAU_EARTH frame coincide with the Earth
      fixed reference frame.


   estrack_vNN.tf

      SPICE FK file that provides topocentric frames for the ESA Ground
      Stations. Created by the ESA SPICE Service.


   new_norcia_topo.tf

      SPICE FK kernel for the topocentric reference frame for the ESA 35m
      tracking antenna at New Norcia.


   earth_topo_050714.tf

      SPICE FK kernel for the topocentric reference frames for the Deep Space
      Network (DSN) stations. This kernel was released on the date indicated
      in the filename.


   rssd0002.tf

      SPICE FK file defining a number of cross-mission frames that could be
      used by any of the users of any of the ESA planetary missions and that
      are not ``built'' in the SPICE toolkit.


   em16_tgo_ops_vNN.tf

      SPICE FK file that provides TGO science operations frames. Created by
      the ESA SPICE Service.


   em16_tgo_sc_mars_noa_vNN.tf

      SPICE FK file that provides Mapping/overwrite of TGO_SPACECRAFT to
      TGO Mars Nadir-Orbit-Aligned frame. Created by the ESA SPICE Service.


   em16_tgo_sc_mars_npo_vNN.tf

      SPICE FK file that provides Mapping/overwrite of TGO_SPACECRAFT to
      TGO Mars Nadir-Power-Optimized frame. Created by the ESA SPICE Service.


   em16_tgo_vNN.tf

      SPICE FK file that provides TGO spacecraft, structures, instruments
      and sensors frames. Created by the ESA SPICE Service.


   em16_dsk_surfaces_vNN.tf

      SPICE FK file containing surface definitions for the Digital Shape
      Kernels of Phobos, Deimos, Mars and TGO.


   em16_edm_vNN.tf

      SPICE FK file that provides EDM spacecraft, structures, instruments
      and sensors frames. Created by the ESA SPICE Service.


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

    aareadme.txt         This file.


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

    Important information about the Mapping/overwrite frame definition
    kernels (em16_tgo_sc_mars_noa_vNN.tf and em16_tgo_sc_mars_npo_vNN.tf):

       These frames have been implemented to overwrite the TGO_SPACECRAFT
       frame definition provided in the ExoMars 2016 Frames Definitions
       kernel (em16_tgo_vNN.tf) and map it to the TGO_MARS_NOA/TGO_MARS_NPO
       frames defined in the ExoMars 2016 Science Operations Frames
       Definitions kernel (em16_tgo_ops_vNN.tf).

       In order to make use of these frames' kernel, ONLY ONE of these files
       MUST BE LOADED AFTER the ExoMars2016 frames definition kernel and
       the ExoMars 2016 Science Operations Frames Definition kernel.

       NOTE THAT BY USING ANY OF THESE KERNEL, THE TGO_SPACECRAFT FRAME
       WILL BE  MAPPED TO THE CORRESPONDING SCIENCE OPERATIONS FRAME, AND
       ANY CK PROVIDING ORIENTATION FOR THE TGO_SPACECRAFT FRAME WILL
       NOT BE USED BY THE APPLICATION SOFTWARE, EVEN IF IT IS LOADED IN
       THE KERNEL POOL.


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

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


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. ``Frames Required Reading'', NAIF Document

   2. ``Kernel Pool Required Reading'', NAIF

   3. ``C-Kernel Required Reading'', NAIF


End of aareadme file.