Hera DSK Files
=============================================================================

   This "aareadme.txt" file describes the contents of the kernels/dsk
   directory of the Hera SPICE Kernel Dataset. It also provides
   the file naming conventions used for the Hera DSK kernels.

   It was last modified on November 14, 2022 by Alfredo Escalante Lopez, ESAC/ESA.


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

   This directory contains the SPICE Digital Shape-Kernel files for
   Hera S/C and target bodies. Particularly, it contains data for the
   following bodies:

       Name                  NAIF ID
      -------------------   ---------
       DIDYMOS              -658030
       DIMORPHOS            -658031


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

   The naming scheme for the Natural Bodies DSKs is:

      TYPE_MM_DER_obj_BODY_N_vNN.bds

   where

        TYPE          type:

                          g for global
                          l for local

        MM            average size of facet (or ground sample distance) in mm.

        DER           derivation:

                          rad for derived from radar
                          spc for derived from spc
                          lgt for deried from light curve

        BODY          body name:

                          didy for Didymos
                          dimo for Dimorphos

        N             global model center - first four digits are latitude
                      to 2 decimal points; last three digits are longitude to
                      two decimal points.

        VV            version: v01, v02, v03 ...

        bds           extension: .bds


   The naming scheme for the Hera S/C DSKs is:

      hera_SC_BODY_vNN.bds

   where

        SC              spacecraft: hera for Hera.

        BODY            body: bus for S/C Bus, hga for High Gain Antenna and
                        sa-/+z for Solar Array -/+Z Panel.

        NN              version: v01, v02, v03 ...

        bds             extension: .bds


Current DSK Kernels Set
-----------------------------------------------------------------------------

   g_50677mm_rad_obj_didy_0000n00000_v001.bds

      Contains the Didymain shape model from as provided in [2].
      Created by the ESA SPICE Service.


   g_08438mm_lgt_obj_dimo_0000n00000_v002.bds

      Contains the Didymoon shape model ellipsoid as provided in [2].
      Created by the ESA SPICE Service.


   g_00250mm_spc_obj_dimo_0000n00000_v003.bds

      Contains the Dimorphos shape model based on DRACO images [3].
      Created by the ESA SPICE Service.


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

   The contents of any DSK file may be easily determined using the
   'dskbrief' utility program, Example:

      % dskbrief <dsk_file_name>

   Descriptive information about how/why/when an DSK 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 <dsk_file_name>

   All binary DSK files (*.bds) contained in this directory are
   little-endian (LTL-IEEE) binary files.


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

     aareadme.txt                         This file.

     TYPE_MM_DER_obj_BODY_N_vNN.obj
     hera_SC_BODY_vNN.obj                 Each DSK has an ASCII vertex-facet
                                          format output file for visualization
                                          purposes (these files can be
                                          previewed natively in modern
                                          Operating Systems).

     TYPE_MM_DER_obj_BODY_N_vNN.png
     hera_SC_BODY_vNN.png                 Each DSK has an image example in png
                                          format for convenience.


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

    Please note that in order to use DSK data you need to use
    N0066 or later Toolkits.


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

     If you have any questions regarding this directory or its
     contents, please contact SPICE support at ESAC:

             Alfredo Escalante Lopez
             (+34) 91-8131-429
             spice@sciops.esa.int

     or NAIF at JPL:

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


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

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

   2. ``HERA DIDYMOS REFERENCE MODEL'', ESA-TECSP-AD-017258,
      Issue 5, Revision 3, 03/02/2020.

   3. ``DIMORPHOS-MODEL-v003'',
      https://dart.jhuapl.edu/SOC/project-data/derived_products/
      flight/ shape_model/dalyErnst_dimorphos221122/
      SPCDIMORPHOS-MODEL-v003-products.php


End of aareadme file.