=============================================================================   
 ROSETTA CK Files                                                                
=============================================================================   
                                                                            
  This "aareadme.txt" file describes the contents of the KERNELS/CK             
  directory of the ROSETTA SPICE data server. It also provides the file         
  naming conventions used for the ROSETTA CK kernels, and it provides           
  identification of the most current version of each kind of CK file.           
                                                                                
  Some of these CK files are produced by an automated system located at ESAC,   
  operated by the ROSETTA Science Ground Segment. We have chosen                
  to use the ESOC naming convention for CK files, which are converted from      
  ESOC's DDID Attitude files.                                                   
                                                                                
  The contents and time span covered by any CK file may be easily determined    
  using the "ckbrief" utility program available in all copies of the            
  SPICE Toolkit. Examples of usage:                                             
     %ckbrief  <ck_file_name> <sclk_file_name> <lsk_file_name>                  
                                                                                
  This utility requires additionally a sclk file and a lsk file; use the        
  latest versions of these files.                                               
                                                                                
  Descriptive information about how/why/when an CK 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 <ck_file_name>                                                   
                                                                                
  All binary CK files (*.BC) 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 Marc Costa Sitja (marc.costa@esa.int) or the ESA SPICE Service
  (esa_spice@sciops.esa.int) if you have any questions.  

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

    1. Data Delivery Interface Document (DDID)       Appendix H - FD            
       products Issue 3.0 (ROS-ESC-IF-5003)                                     
                                                                                
    2. CK Required Reading. NAIF Document No. 174.08  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) CK Tutorial                 15_ck.ppt                                 
       b) Porting Kernels Tutorial    09_porting_kernels.ppt                    
                                                                                
    4. NAIF IDs Required Reading. NAIF Document No. 219.12  30 Jul 2003         
                                                                                
    5. Rosetta PLID Annex A (RO-ESC-IF-5507)                                    
                                                                                
                                                                                
=============================================================================   
Rosetta CK Directory Structure                                                  
=============================================================================   

 aareadme.txt            Text file describing the directory structure,          
                         the naming conventions for the CKs, and the current    
                         version(s) of each CK type.                            
                                                                                
 former_versions         Subdirectory that contains obsolete versions of the    
                         CK files that have been updated in the Current CK      
                         Kernels Set.                                           
                                                                                
                                                                                
=============================================================================   
ROSETTA Spacecraft CK Naming Covention for the cruise phase:                    
                                                                                
          ffff_yYYMMDDhhmmss_vvvvv.BC                                           
                                                                                
=============================================================================   
                                                                                
                                                                                
      token           description                                           
    ------------    --------------------------------------------------    
    ffff            Source Product Type Identifier:                       
                       ATNR -- Predicted S/C attitude.                    
                       ATPR -- Medium Term planning S/C attitude.         
                                                                          
    y               Data Type Identifier                                  
                       P -- Predicted data                                
    YYMMDDhhmmss    Coverage start time of the data contained             
                    in the ATNR or ATPR file.                                 
    vvvv            version number                                        

                                                                                
=============================================================================   
ROSETTA Spacecraft CK Naming Covention for the science phase:                   
                                                                                
                ffff_Dc_nnn_vv_ww_a_vvvvv.BC                                    
                                                                                
=============================================================================   
                                                                                
       token          description                                             
    ------------   --------------------------------------------               
       ffff        CATT, RATM RATT (See below)                             
                                                                           
       c           is L for long term products or M for medium term        
                   products, S for short term and V for very short term    
                   (note that there are currently no FD products associated
                   with the short term cycle).                             
                                                                           
       nnn         is the planning cycle counter on 3 digits, starting from
                   001, strictly monotonically increasing per planning cycle
                   type e.g.:                                              
                                                                           
                         - for LTP products 001 for pre-landing operations,
                           002 for first cycle including lander delivery and
                           first extended monitoring phase part and so on. 
                                                                           
                         - for MTP products, the counter as agreed between FD
                           and FCT an documented in FCT timelines (see [FOP]),
                           VSPL file and PTSL.                             
                                                                           
       vv          is the version within the planning cycle (e.g. in case  
                   products have to be re-generated, due to errors). Note that
                   a full set of consistent products shall be delivered for a
                   cycle containing the same vv version. In case redelivery is
                   required, a full set of consistent products shall be 
                   delivered, with a new incremented vv version. In the same 
                   way, FD expects that deliveries of all input products from 
                   the SGS corresponding to a given cycle have the same vv 
                   version.
                                                                           
       ww is:                                                              
                                                                           
                         - for VSTP products __.                           
                                                                           
                         - for MTP products generated by FD the version of the
                           corresponding SGS MTP input products.           
                                                                           
                         - for LTP products generated by FD for pre-landing
                           operations __ (no SGS inputs are required by FD for
                           LTP for pre-landing operations).                
                                                                           
                         - for LTP products generated by FD for the extended
                           monitoring phase the version of the corresponding 
                           SGS LTP input products.                             
                                                                           
       a           is a character indicating the trajectory type that can take 
                   the following values:                                       
                                                                           
                         - For VSTP products _.                            
                                                                           
                         - For MTP/LTP products in the pre-landing phase 'A', 
                           'B' or 'C'... corresponding to nominal trajectory, 
                           first backup trajectory, second backup trajectory...         
                                                                           
                         - For MTP/LTP products in the extended monitoring 
                           phase 'H' for products that correspond to high 
                           activity case trajectories or 'P' for products that 
                           corresponds to preferred trajectory.
                                                               
       vvvvv       version number    


=============================================================================   
ROSETTA Spacecraft CK Naming Covention for measured and reconstructed 
attitude: 
                                                                                  
                ROS_SC_type_YYMMDD_yymmdd_Vvv.BC
                                                                                 
=============================================================================

      token           description                                               
      ---------       -------------------------------------------------------   
      type            Referenece to the type of data
                         MES: for measured
                         REC: for reconstructed                       
      YYMMDD          Date of coverage start
      yymmdd          Date of coverage end
      vv              version number  


=============================================================================   
ROSETTA Spacecraft CK Naming Covention for non-ESAC reconstructed attitude: 
                                                                                  
                ROS_SC_originator_type_YYMM_yymm_Vv.BC
                                                                                 
=============================================================================

      token           description                                               
      ---------       -------------------------------------------------------   
      originator      Institution that originated the kernel
      type            Refernece to the technique used to process the data                       
      YYMM            Year and month of coverage start
      yymm            Year and month of coverage end      
      v               version number    


=============================================================================   
ROSETTA Lander CK Naming Covention for the Lander Mission:                    
                                                                                
          LATT_fff2LDR_ppp_[originator]_vvvv.BC                                           
                                                                                
=============================================================================   
                                                                                
                                                                                
      token           description                                           
    ------------    --------------------------------------------------    
    fff             Attitude Reference frame.
                                                                          
    ppp             Lander Mission Phase:
                       SDL -- Separation, Descent and First Landing                                  
                       RBD -- Rebounds
                       FSS -- First Science Sequence

    [originator]    Source data originator institution.                               
    vvvv            version number.       


=============================================================================
ROSETTA Comet 67P/C-G CK Naming Covention for "Cheops" rotation:

                CATT_CHEOPS__YYMMDD_yymmdd.BC

=============================================================================

      token           description
      ---------       -------------------------------------------------------
      YYMMDD          Date of coverage start
      yymmdd          Date of coverage end


                                                                                
=============================================================================   
Current CK Kernels Set                                                          
=============================================================================   
                                                                                
 Name                              Comments                                     
 --------------------------------  -------------------------------------        
                                                                                
 ATNR_PYYMMDDhhmmss_xxxxx.BC       Contains Rosetta predicted attitude          
                                   information covering the time span           
                                   starting at the date YYMMDDhhmmss.    

 ATNR_PYYMMDDhhmmss_T6_xxxxx.BC    Contains Rosetta predicted attitude        
                                   information covering the time span           
                                   starting at the date YYMMDDhhmmss. 
                                   This product is a Type 6 CK kernel and 
                                   requires at least the SPICE Toolkit N0065 
                                   to be used.    
                                                                                
 CATT_DV_nnn_vv_______vvvvv.BC     Contains comet attitude, determined as       
                                   result of the navigation process in the      
                                   VSTP cycle and propagated into the future.   
                                   This kernel provides the comet attitude in
                                   the frame 67P/C-G_CK.

 CATT_CHEOPS__YYMMDD_yymmdd.BC     Contains comet attitude, for a limited
                                   period of time as provided by the PCK that
                                   contains the "Cheops reference frame"
                                   orientation information. This kernel
                                   provides the comet attitude in the frame
                                   67P/C-G_CK.
                                                                                
 RATM_DM_nnn_vv_ww_a_vvvvv.BC      Contains spacecraft predicted attitude, 
                                   generated at medium term planning based on 
                                   the attitude requests provided by the SGS.                
                                                                                
 RATT_DV_nnn_vv_ww____vvvvv.BC     Contains spacecraft predicted attitude, very 
                                   short term plan, as commanded to the S/C in 
                                   the operations loop in the VSTP cycle.   
 
 RATT_DV_nnn_vv_ww_T6_vvvvv.BC     Contains spacecraft predicted attitude, very
                                   short term plan, as commanded to the S/C in 
                                   the operations loop in the VSTP cycle. This 
                                   product is a Type 6 CK kernel and requires 
                                   at least the SPICE Toolkit N0065 to be used.

 LATT_ROS2LDR_PRESEP_Vv_v.BC       Contains Rosetta Lander orientation before 
                                   the Lander separation from the Rosetta
                                   Orbiter. The Rosetta Lander is   
                                   attached to the Rosetta Orbiter.                                   

 LATT_CFF2LDR_FSS_Vvvv.BC          Contains Rosetta Lander attitude for the
                                   First Science Sequence and beyond 
                                   (until EOM). The data was provided by 
                                   SONC-FD.

 LATT_EME2LDR_SDL_Vvvv.BC          Contains Rosetta Lander attitude for the
                                   Separation, Descent and First Landing as 
                                   defined by the data was by SONC-FD.  

 LATT_ROS2LDR_SDL_ROMAP_Vvvv.BC    Contains Rosetta Lander attitude for the
                                   Separation, Descent and First Landing as 
                                   defined by the data was by ROMAP.                                                                    

 ROS_LBOOM_V0.BC                   Orientation of the Rosetta Boom 2            
                                   ('ROS_RPC_BOOM2' frame) relative to the      
                                   Rosetta spacecraft frame ('ROS_SPACECRAFT'   
                                   frame).                                      
                                                                                
 ROS_HGA_YYYY_Vvvvv.BC             Contains orientation of the High Gain        
                                   Antenna Frame for the year specified in the  
                                   file name.                                   
                                                                                
 ROS_SA_YYYY_Vvvvv.BC              Contains orientation of the Solar Arrays     
                                   frames for the year specified in the file    
                                   name.        

 ROS_VIRTIS_M_YYMM_YYMM_VV.BC      Contains the actual orientation of the 
                                   VIRTIS-M articulating frame
                                   ('ROS_VIRTIS-M_SCAN'), created by merging 
                                   individual CKs produced by the VIRTIS team.

 ROS_VIRTIS_ZERO_V1.BC             Contains the fictitious orientation of the
                                   VIRTIS-M articulating frame
                                   ('ROS_VIRTIS-M_SCAN') at "zero" position. 
                                   This can be used only for applications for 
                                   which assuming that VIRTIS-M mirror was at 
                                   zero position is acceptable.

 ROS_OSIRIS_VV.BC                  Contains the best estimate of the NAC and
                                   WAC frames ('ROS_OSIRIS_NAC' and
                                   'ROS_OSIRIS_WAC') orientation created by
                                   ESA SPICE Service based on data from MPS.

 RATM_DM_nnn_vv_ww_a_vvvvv.BC      Contains spacecraft predicted attitude, 
                                   generated at medium term planning based on 
                                   the attitude requests provided by the SGS.  
  
 ROS_SC_MES_YYMMDD_yymmdd_Vvv.BC   Contains Rosetta measured attitude          
                                   information covering the time span           
                                   starting at the date YYMMDD and finishing
                                   at the date yymmdd. Version 01 consist of 
                                   a complete interpolation segment whereas 
                                   version 02 and 03 kernels have multiple
                                   interpolation segments defined by a 60 
                                   second maximum interval in between 
                                   measured quaternions.

 ROS_SC_REC_YYMMDD_yymmdd_Vvv.BC   Contains Rosetta reconstructed attitude          
                                   information covering the time span           
                                   starting at the date YYMMDD and finishing
                                   at the date yymmdd. This attitude has been
                                   reconstruced by Bjoern Grieger using OSIRIS
                                   images of the comet nucleus.

 ROS_ORBITER_EXTENSION_Vv.BC       This product contains an extension of the
                                   Rosetta S/C orientation after end of mission 
                                   in order to have coverage until 2017-01-01.
                                   The Rosetta S/C orientation vector is constant
                                   with respect to the Churyumov-Gerasimenko
                                   C-Kernel based frame and is defined by 
                                   the last quaternion provided by the 
                                   RATT_DV_257_02_01____00344.BC kernel.
                                   The file is generated using the NAIF 
                                   utility MSOPCK.      

 ROS_SC_DLR_S4S_1408_1409_Vv.BC    This CK contains 251 Type 3 CK segments
                                   each covering a two-second interval
                                   corresponding to one of OSIRIS images
                                   taken in August-September 2014 and used
                                   in producing the SHAP4S shape model.                                                          
                                                                                
                                                                                                                                   
CATT kernels are created using an 'artificial' clock kernel defined inside the  
ROS_CHURYUMOV_Vvv.TF frames kernel. Therefore, loading the frames kernel is     
necessary in order to use the CATT kernels.                                     
                                                                                
RATM kernels shall be used with the S/C clock kernel 'ros_triv.tsc' available in
the sclk directory.                                                             
                                                                                
All other kernels shall be used with the latest available Rosetta nominal kernel
(ROS_YYMMDD_STEP.TSC).                                                          
                                                                                
                                                                                
-------------------                                                             
                                                                                
        This file was last modified on Aug. 24, 2020 (M. Costa)
                     

End of aareadme file.                                                                         
