=============================================================================
ROSETTA PCK Files
=============================================================================

  Last Update: 15 MAY 2006

  This "aareadme.txt" file describes the contents of the KERNELS/PCK directory
  of the ROSETTA SPICE data server. It also provides the file naming
  conventions used for the ROSETTA PCK kernels, and it provides identification
  of the most current version of each kind of PCK file.

  PCK files in this directory are either binary or text files. Text files are
  created manually with the information from mainly the 2000 IAU Report,
  with the exception of the Rosetta Asteroid Targets (Lutetia and Steins),
  which information was obtained from "The Rosetta Asteroid Targets" paper
  [Ref 4]. Binary files are created from the information contained in the
  EOP files provided by IERS.

  All binary PCK files (*.BPC) contained in this directory are unix binary
  files. These may be used as is (without format conversion) in a non-unix
  environment by using any recent version of the SPICE Toolkit (Version N0052
  or later). [Ref 2a]

  All text PCK files (*.TPC) contained in this directory are unix text files.
  These may be used in a non-compatible text environment by using the ASCII
  mode of FTP to port the files. [Ref 2a]

  Contact Jorge Diaz del Rio (jdiaz@rssd.esa.int) ot Joe Zender 
  (Joe.Zender@esa.int) if you have any questions.

=============================================================================
References
=============================================================================

  1. PCK Required Reading. NAIF Document No. 254.05

  2. Selected SPICE Tutorials from the NAIF server:
ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/office/individual_docs/
       
       a) Porting Kernels Tutorial     09_porting_kernels.ppt
       b) PCK Tutorial                 16_pck.ppt

  3. NAIF IDs Required Reading. NAIF Document No. 219.12

  4. "The Rosetta Asteroid Targets", M. A. Barucci, Padova.  31 Jan 2006

=============================================================================
Rosetta PCK Directory Structure
=============================================================================
  aareadme.txt        Text file describing the directory structure, the naming
                      conventions for the PCK, and the current version(s) of
                      each PCK type.

  former_versions     Subdirectory that contains obsolete versions of the PCK
                      files that have been updated in the Current PCK Kernel
                      Set.

=============================================================================
Rosetta Binary PCK Naming Convention          EARTH_[sdat]_[edat]_[pdat].BPC
=============================================================================

      token           description
      ---------       -------------------------------------------------------
       [sdat]         Coverage start time of the file in YYMMDD format.

       [edat]         Coverage end time of the file in YYMMDD format.

       [pdat]         Start time for the predicted data in the file in YYMMDD
                      format.

=============================================================================
Current PCK Kernels Set
=============================================================================

 Name                            Comments
 ------------------------------  --------------------------------------------
 EARTH_[sdat]_[edat]_[pdat].BPC  PCK file containing the orientation of the
                                 Earth as a function of time for the interval
                                 [sdat] to [edat]. From [pdat] the information
                                 contained in the file corresponds to
                                 predicted data. The rotational effects
                                 included are precession, nutation, rotation
                                 through true siderial time, polar motion and
                                 nutation corrections.

 DE403-MASSES.TPC                PCK file containing the masses for the sun,
                                 planets, satellites and planetary barycenters
                                 These masses are given as ratios to of Solar
                                 GM to barycenter GM.

 PCK00008.TPC                    PCK file containing the size, shape, radii
                                 and orientation constants for planets,
                                 satellites, Sun and some asteroids.

 ROS_LUTETIA_LC1_V02.TPC         Preliminary PCK file containing draft values
                                 for the pole orientation, rotation period and
                                 shape obtained from [Ref 4] for the Asteroid
                                 21 Lutetia, acording to the lightcurves Pole
                                 Solution #1 presented in [Ref 4]. 

 ROS_LUTETIA_LC2_V02.TPC         Preliminary PCK file containing draft values
                                 for the pole orientation, rotation period and
                                 shape obtained from [Ref 4] for the Asteroid
                                 21 Lutetia, acording to the lightcurves Pole
                                 Solution #2 presented in [Ref 4].  

 ROS_LUTETIA_R1_V02.TPC          Preliminary PCK file containing draft values
                                 for the pole orientation, rotation period and
                                 shape obtained from [Ref 4] for the Asteroid
                                 21 Lutetia, acording to the Radar Pole
                                 Solution #1 presented in [Ref 4]. 

 ROS_LUTETIA_R2_V02.TPC          Preliminary PCK file containing draft values
                                 for the pole orientation, rotation period and
                                 shape obtained from [Ref 4] for the Asteroid
                                 21 Lutetia, acording to the Radar Pole
                                 Solution #2 presented in [Ref 4]. 

 ROS_STEINS_V02.TPC              Preliminary PCK file containing draft values
                                 for the rotation period and shape obtained
                                 from ESA Science/Rosetta pages for the
                                 Asteroid 2867 Steins and placeholder values
                                 for pole direction (set arbitrarily to line
                                 up with the ecliptic north pole in J2000
                                 coordinates.)