KPL/SCLK

\beginlabel
PDS_VERSION_ID               = PDS3
RECORD_TYPE                  = STREAM
RECORD_BYTES                 = "N/A"
^SPICE_KERNEL                = "VO1_FSC.TSC"
MISSION_NAME                 = VIKING
SPACECRAFT_NAME              = "VIKING ORBITER 1"
DATA_SET_ID                  = "VO1/VO2-M-SPICE-6-V1.0"
KERNEL_TYPE_ID               = SCLK
PRODUCT_ID                   = "VO1_FSC.TSC"
PRODUCT_CREATION_TIME        = 2000-04-21T10:53:21
PRODUCER_ID                  = "NAIF/JPL"
MISSION_PHASE_NAME           = {
                               PRIMARY_MISSION,
                               EXTENDED_MISSION,
                               CONTINUATION_MISSION,
                               SURVEY_MISSION
                               }
PRODUCT_VERSION_TYPE         = ACTUAL
PLATFORM_OR_MOUNTING_NAME    = "N/A"
START_TIME                   = "N/A"
STOP_TIME                    = "N/A"
SPACECRAFT_CLOCK_START_COUNT = "N/A"
SPACECRAFT_CLOCK_STOP_COUNT  = "N/A"
TARGET_NAME                  = MARS
INSTRUMENT_NAME              = "N/A"
NAIF_INSTRUMENT_ID           = "N/A"
SOURCE_PRODUCT_ID            = "N/A"
NOTE                         = "See comments in the file for details"
OBJECT                       = SPICE_KERNEL
  INTERCHANGE_FORMAT         = ASCII
  KERNEL_TYPE                = CLOCK_COEFFICIENTS
  DESCRIPTION                = "SCLK file containing linear piecewise
function representing VO1 FSC on-board clock. This function was generated as
the result of VO1 image time tags restoration. "
END_OBJECT                   = SPICE_KERNEL
\endlabel


Viking Orbiter 1 Reconstructed Frame Start Count (FSC) SCLK file
--------------------------------------------------------

   This file contain data necessary to convert a Viking Orbiter 1
   FSC count to the ET time corresponding to it. These data are
   based on the results of VO1 image times reconstruction done at
   NAIF/JPL. The process of this reconstruction is described in
   detail in the "VO Image Time Reconstruction" document.

   Note that the main purpose of this file is to store the
   reconstructed FSC counter; the on-board clock defined by the
   function in this file was not used to time tag any of the
   orientation data in CK files.

   To avoid confusion with the other VO1 clock used for time tagging,
   the FSC on-board clock in this file was assigned the NAIF ID
   code -27999.
   

Version
--------------------------------------------------------
 
   Version 1.0.1 -- April 20, 2000
   
      Comments in the file were slightly reformatted and augmented.
 
   Version 1.0.0 -- July 22, 1996
        

Implementation notes
--------------------------------------------------------
 
   This SPICE SCLK file is constructed so that valid SCLK strings
   are the eight digit VO1 FSC count associated with each VO1 image.
   Note that the actual "image time" (the time of the beginning,
   middle or the end of exposure) has a significant offset from
   the FSC tick start time. This offset depends on the exposure
   duration and is described in the "VO Image Time Reconstruction"
   document.

   You must load this file into the kernel pool before using any
   of the SPICELIB SCLK routines. The code fragment

      CALL LDPOOL ( < name of this file > )
 
   performs this task. To convert between ET and UTC, you will also
   need to load a leapseconds kernel. The additional call to LDPOOL,

      CALL LDPOOL ( < name of your leapsecond file > )
 
   will accomplish this. Note that you must supply the actual names
   of the files used on your system as arguments to LDPOOL. Because
   the file names are system dependent, we do not list them here.

   For more information, consult your SPICELIB required reading
   files. The following areas are covered:

      SCLK system                     SCLK required reading
      Time systems and conversion     TIME required reading
      Kernel pool                     KERNEL required reading


Kernel data
--------------------------------------------------------

\begindata

 SCLK_KERNEL_ID           = ( @22-JUL-1996 )

 SCLK_DATA_TYPE_27999        = ( 1 )
 SCLK01_TIME_SYSTEM_27999    = ( 2 )
 SCLK01_N_FIELDS_27999       = ( 1 )
 SCLK01_MODULI_27999         = ( 60000000 )
 SCLK01_OFFSETS_27999        = ( 25837050 )
 SCLK01_OUTPUT_DELIM_27999   = ( 1 )

 SCLK_PARTITION_START_27999  = ( 
                                0
                                231791
                                644942
                                1569121
                                3367553
                                5555717
                                6396566
                                7572950
                                8087730
                                9835672
                                10866610
                                11503583
                                12217716
                                13159619
                                13679685
                                14664700
                                15449939
                                16432925
                                17479492
                                17896518
                                18344818
                                20321730
                                23280832
                                24166658
                                24262845
                                24359029
                                24609280
                                25992950
                                26522392
                                27368930
                                27915783
                                            )

 SCLK_PARTITION_END_27999    = ( 
                                231791
                                644942
                                1569121
                                3367553
                                5555717
                                6396566
                                7572950
                                8087730
                                9835672
                                10866610
                                11503583
                                12217716
                                13159619
                                13679685
                                14664700
                                15449939
                                16432925
                                17479492
                                17896518
                                18344818
                                20321730
                                23280832
                                24166658
                                24262845
                                24359029
                                24609280
                                25992950
                                26522392
                                27368930
                                27915783
                                59999999
                                            )

 SCLK01_COEFFICIENTS_27999   = ( 

               0 -742936101.084011  4.480002320
          231791 -741897676.845143  4.480001506
          644942 -740046759.578601  4.480001685
         1569121 -735906436.111559  4.480001416
         3367553 -727849458.210550  4.480001972
         5555717 -718046479.059529  4.480002284
         6396566 -714279473.752967  4.480001816
         7572950 -709009271.245943  4.480001816
         8087730 -706703055.797485  4.480001869
         9835672 -698872272.708142  4.480001557
        10866610 -694253669.451953  4.480001151
        11503583 -691400029.539901  4.480000884
        12217716 -688200712.915836  4.480000934
        13159619 -683980986.490315  4.480000934
        13679685 -681651090.175512  4.480000934
        14664700 -677238222.129167  4.480000778
        15449939 -673720350.640383  4.480000830
        16432925 -669316572.195161  4.480000882
        17479492 -664627950.891482  4.480000922
        17896518 -662759673.743136  4.480000929
        18344818 -660751289.419364  4.480000581
        20321730 -651894716.843243  4.480001297
        23280832 -638637935.825957  4.480001191
        24166658 -634669434.296886  4.480000989
        24262845 -634238516.448398  4.480001715
        24359029 -633807611.943517  4.480001275
        24609280 -632686487.136533  4.480001142
        25992950 -626487643.963656  4.480001192
        26522392 -624115743.164982  4.480000986
        27368930 -620323251.820923  4.480001408
        27915783 -617873349.601991  4.480001089

                                            )

\begintext


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

   Contact NAIF node of the Planetary Data System if you have any
   questions regarding this SCLK file.

      Charles H. Acton, Jr
      (818)-354-3869 
      chuck.acton@jpl.nasa.gov
      
      Boris V. Semenov
      (818)-354-8136 
      boris.semenov@jpl.nasa.gov
