                                                                              
============================================================================= 
ROSETTA SPK Files                                                             
============================================================================= 
                                                                              
  Last update:  7 APR 2008                                                    
                                                                              
  This "aareadme.txt" file describes the contents of the KERNELS/SPK          
  directory of the ROSETTA SPICE data server. It also provides the file       
  naming conventions used for the ROSETTA SPK kernels, and it provides        
  identification of the most current version of each kind of SPK file.        
                                                                              
  Some of these SPK files are produced by an automated system located         
  at ESTEC, operated by the ROSETTA Science Operations Center (RSOC).         
  For these we have chosen to use the ESOC naming convention for SPK files,   
  which are converted from ESOC's DDID Orbit files. Although this convention  
  doesn't seem very descriptive and holds some redundant information, it      
  could be useful to use the same name style for the sake of consistency.     
  Also, data handling performed by the automated system will be easier and    
  faster.                                                                     
                                                                              
  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. Examples of usage:                                           
     %brief  <spk_file_name>                                                  
     %brief  <*.bsp>                                                          
     %brief  <xxx*.bsp>                                                       
                                                                              
  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>                                                
                                                                              
  All binary SPK files (*.BSP) contained in this directory are unix binary    
  files. These may be used as is (without format conversion) in a non-unix    
  environment when using any recent version of the SPICE Toolkit (Version     
  N0052 or later).  [Ref 3b]                                                  
                                                                              
  Contact Jose Luis Vazquez (jlvazquez@sciops.esa.int) if you have any questions.
                                                                              
                                                                              
============================================================================= 
References                                                                    
============================================================================= 
    1. Data Delivery Interface Document (DDID)       Appendix H - FD          
       products Issue 3.0 (ROSETTA-ESC-IF-5003)                               
                                                                              
    2. SPK Required Reading. NAIF Document No. 168.10  05 Sep 2002            
                                                                              
    3. Selected SPICE Tutorials from the NAIF server:                         
ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/office/individual_docs
                                                                              
       a) SPK Tutorial                14_spk.ppt                              
       b) Porting Kernels Tutorial    09_porting_kernels.ppt                  
                                                                              
                                                                              
                                                                              
============================================================================= 
ROSETTA SPK Directory Structure                                               
============================================================================= 
 aareadme.txt         Text file describing the directory structure, the naming
                      conventions for the SPKs, and the current version(s) of 
                      each SPK type.                                          
                                                                              
 former_versions      Subdirectory that contains obsolete versions of the     
                      SPK files that have been updated in the Current SPK     
                      Kernels Set.                                            
                                                                              
                                                                              
                                                                              
============================================================================= 
ROSETTA Spacecraft SPK Naming Covention        ffff_______________vvvvv.BSP   
============================================================================= 
                                                                              
                                                                              
      token          description                                              
      ------------   --------------------------------------------             
      ffff           Source Product Type Identifier:                          
                        ORHR -- S/C Orbit, Cruise, heliocentric               
                        ORER -- S/C Orbit, 1st Earth swingby                  
                        ORMR -- S/C Orbit, Mars Swingby, Mars Centric         
                        ORFR -- S/C Orbit, 2nd Earth swingby, Earth Centric   
                        ORGR -- S/C Orbit, 3rd Earth swingby, Earth Centric   
                        ORPR -- S/C Orbit, medium term planning, comet centric
                        ORWR -- S/C orbit, comet centric                      
                        ORHW -- comet orbit, heliocentric                     
                        ORHO -- 1st asteroid orbit, heliocentric              
                        ORHS -- 2nd asteroid orbit, heliocentric              
                                                                              
      vvvvv          version number                                           
                                                                              
============================================================================= 
DSN Stations SPK  Naming Convention     EARTHSTNS_[spec]_yymmdd.BSP           
============================================================================= 
                                                                              
      token           description                                             
      ---------       ------------------------------------------------------- 
      [spec]          Reference frame label:                                  
                        FX:     EARTH_FIXED alias used.                       
                        ITRF93: ITRF93 label used.                            
      yymmdd          Release date.                                           
                                                                              
                                                                              
============================================================================= 
Planet and Satellite Ephemeris SPK Naming Convetion                           
============================================================================= 
 Use original names assigned by NAIF, in uppercase. For example:              
                                                                              
          DE405.BSP      Planetary ephemeris                                  
                                                                              
                                                                              
                                                                              
============================================================================= 
Current SPK Kernels Set                                                       
============================================================================= 
                                                                              
Note: Files EARTHSTNS_FX_yymmdd.BSP and EARTHSTNS_ITRF93_yymmdd.BSP contain   
the same data. These files only differ in that the second one use the         
reference frame label 'ITR93' instead of 'EARTH_FIXED'. 'EARTH_FIXED' alias   
must be map to either 'ITR93' or 'IAU_EARTH' before using the file. For high  
accuracy work, the EARTHSTNS_ITRF93_yymmdd.BSP is recommended (on the basis   
of ease of use).                                                              
                                                                              
                                                                              
 Name                               Comments                                  
 ---------------------------------  ----------------------------------------- 
 67P_CHURY_GERAS_2004_2016.BSP      Contains ephemeris data for the Comet     
                                    Churyumov-Gerasimenko/67P. This file has  
                                    been originated from JPL Horizons On-Line 
                                    Ephemeris System and IT IS NOT an official
                                    Rosetta Project SPK. It is provided as    
                                    support to study cases until an official  
                                    SPK is released. Spans from January 2004  
                                    to January 2016.                          
                                                                              
 C2001Q4.BSP                        Contains ephemeris data for the comet     
                                    C2001/Q4 - NEAT. Spans from January 2004  
                                    to October 2004.                          
                                                                              
 C2002T7.BSP                        Contains ephemeris data for the comet     
                                    C2002/T7 - LINEAR. Spans from January 2004
                                    to October 2004.                          
                                                                              
 DE405S.BSP                         Contains ephemeris data for planet        
                                    barycenters, and for the Sun, planets     
                                    and satellites mass centers. It covers    
                                    until 2050.                               
                                                                              
 EARTHSTNS_FX_yymmdd.BSP            Contains ephemeris data for NASA          
                                    DSN stations relative to the terrestrial  
                                    reference frame ITR93. In the interest of 
                                    flexibility, in this file the reference   
                                    frame is labeled with the alias           
                                    'EARTH_FIXED'. Any application using this 
                                    file must map the alias 'EARTH_FIXED' to  
                                    either 'ITR93' or 'IAU_EARTH'. This file  
                                    was released on yy-mm-dd.                 
                                                                              
 EARTHSTNS_ITRF93_yymmdd.BSP        Contains ephemeris data for NASA          
                                    DSN stations relative to the terrestrial  
                                    reference frame label 'ITR93'. This file  
                                    was released on yy-mm-dd.                 
                                                                              
 NEW_NORCIA.BSP                     Contains ephemeris data for the           
                                    ESA New Nortia station.                   
                                                                              
 ORER_______________vvvvv.BSP       Contains Rosetta spacecraft reconstructed 
                                    ephemeris of 1st Earth flyby. Spans the   
                                    1st Earth flyby period. These ephemeris   
                                    corresponds to the ESOC orbit file named: 
                                    ORER_FDLRMA_DA______________vvvvv.ROS     
                                    where vvvvv designates the version number.
                                                                              
 ORFR_______________vvvvv.BSP       Contains Rosetta spacecraft predicted     
                                    ephemeris of 2nd Earth flyby. Spans the   
                                    2nd Earth flyby period. These ephemeris   
                                    corresponds to the ESOC orbit file named: 
                                    ORFR_FDLRMA_DA______________vvvvv.ROS     
                                    where vvvvv designates the version number.
                                                                              
 ORGR_______________vvvvv.BSP       Contains Rosetta spacecraft predicted     
                                    ephemeris of 3rd Earth flyby. Spans the   
                                    3rd Earth flyby period. These ephemeris   
                                    corresponds to the ESOC orbit file named: 
                                    ORGR_FDLRMA_DA______________vvvvv.ROS     
                                    where vvvvv designates the version number.
                                                                              
 ORHO_______________vvvvv.BSP       Contains ephemeris for the asteroid Steins,
                                    that corresponds to the ESOC orbit file named
                                    ORHO_FDXRMY_DA______________vvvv.ROS, where
                                    X can be R or L, Y can be A or B, and vvvv is
                                    the version number.                       
                                                                              
 ORHR_______________vvvvv.BSP       Contains Rosetta spacecraft predicted and 
                                    reconstructed cruise ephemeris. Spans the 
                                    cruise phase, from launch to comet        
                                    rendezvous maneouver. These ephemeris     
                                    corresponds to the ESOC orbit file named: 
                                    ORHR_FDLRMA_DA______________vvvvv.ROS     
                                    where vvvvv designates the version number.
                                                                              
 ORHS_______________vvvvv.BSP       Contains ephemeris for the asteroid Lutetia,
                                    that corresponds to the ESOC orbit file named
                                    ORHS_FDXRMY_DA______________vvvvv.ROS, where
                                    X can be R or L, Y can be A or B, and vvvv is
                                    the version number.                       
                                                                              
 ORMR_______________vvvvv.BSP       Contains Rosetta spacecraft reconstructed 
                                    ephemeris of Mars flyby. Spans the        
                                    Mars flyby period. These ephemeris        
                                    corresponds to the ESOC orbit file named: 
                                    ORMR_FDLRMA_DA______________vvvvv.ROS     
                                    where vvvvv designates the version number.
                                                                              
                                                                              
 ORHW_______________vvvvv.BSP       Contains ephemeris data for the Comet     
                                    Churyumov-Gerasimenko/67P. These ephemeris are
                                    the same contained in the corresponding ESOC
                                    orbit file named ORHW_FDLRMA_DA______________vvvvv.ROS,
                                    where vvvvv designates the version number.
                                                                              
 ORWR_SGS____DATxxxxx____.BSP       Contains ephemeris data for the Comet 
                                    Churyumov-Gerasimenko/67P. These kernels are
                                    created by the Rosetta SGS for study purposes.
                                                                              
                                                                              
 OUTERPLANETS_Vvvvvv.BSP            Epemeris information for the outer planets
                                    of the solar system: Jupiter, Saturn,     
                                    Uranus and Neptune.                       
                                                                              
 ROS_STRUCT_V1.BSP                  This file contains the location of various
                                    Rosetta instruments and structures.       
                                                                              
 TEMPEL1-9P-DI-P.BSP                Contains predicted ephemeris for the comet
                                    Tempel-1/9P courtesy of Deep Impact Team. 
                                    These ephemeris were compute just before  
                                    the impact. Spans from May 2005 to        
                                    September 2005.                           
                                                                              
                                                                              
