KPL/SCLK

   *************************************************************************
   | Task Order |      Vendor        |  Mission  |        Spacecraft       |
   |------------|--------------------|-----------|-------------------------|
   |   TO2IM    | Intuitive Machines |   IM-1    |   NOVA-C Lunar Lander   |
   |            |                    |           |   (Odysseus)            |
   *************************************************************************

 
IM-1 SCLK Kernel (ID -370011)
===========================================================================
 
   This SCLK kernel contains the data necessary for converting from
   ephemeris time (ET) to ticks for a clock associated with the IM-1
   NOVA-C spacecraft with ID code -370011.


Version and Date
--------------------------------------------------------

   Version 1 -- December 09, 2024 -- Derek Maggard, CLPS

      Recreated the SCLK kernel from ``Version 0.8'', see ``Status and
      Pedigree''. Modified comments to ensure consistency within CLPS
      archive. The original name of this file was IM-1_nova-c_sclk.tsc.

   Version 0.8 -- August 14, 2024 -- Brent Mathews, Intuitive Machines, US

      Final version (v8) delivered to NASA. Kernel generated from Excel
      file called ``im1_clock_error_reconstruct_v2.xlsx'' originally
      made by Shaun Stewart, Intuitive Machines, US and David Johnson,
      Intuitive Machines, US based on a best estimate for the clock
      drift rate.


Clock Correlation
--------------------------------------------------------

   IM post-processing found that the on-board clock had a drift-rate
   of 1.64034E-06 sec/sec relative to the ground clock.

   This kernel was generated with the clock starting at the 
   Launch-Vehicle-Separation epoch.

   There are two clock resets:
      
      Clock reset 1: 761740056.9 ET to 761743036.9 ET

      The simple offset corrector just resets the offset to 0 at
      761717436 ET before starting increment again.

      Clock reset 2: 761783013.3 ET to 761786213.3 ET

      Simple offset corrector resets offset to 0 at 761786216 ET.


Status and Pedigree
--------------------------------------------------------
 
   Intuitive Machines provided the data inside the SCLK kernel
   ``IM-1_nova-c_sclk.tsc''. This SCLK was created from this data
   using the following method:

      SCLK coefficient rows were removed if the ``rate'' values were
      close enough to be considered duplicating an adjacent ``rate''.

      The ``sclk'' column was converted to seconds (starting from
      Launch- Vehicle- Separation epoch).

      On-board TDB (sclk) was first lined up with actual TDB, (parsys),
      then ``0.109410609690055'' was added to the ``sclk'' values, as
      that was the original SCLK kernel's initial offset time.

      New sclk/parsys pairs were created to ensure that all ``sclk''
      values were integral.

      Finally, the data was converted into a SCLKSCET which MAKCLK used
      to create this SCLK kernel.


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

   If you have any questions regarding this file contact:

      Derek R. Maggard, CLPS, Derek.R.Maggard@nasa.gov


Usage
--------------------------------------------------------

     This file and an appropriate leap seconds kernel (LSK) must be
     loaded into the user's program by a call to the FURNSH subroutine:

          CALL FURNSH ( 'file_name' )    -- FORTRAN
          furnsh_c ( "file_name" );      -- C
          cspice_furnsh, 'file_name'     -- IDL
          cspice_furnsh( 'file_name' )   -- MATLAB

     in order to use the SPICELIB SCLK family of subroutines to convert
     spacecraft on-board clock to ET and vice versa.


SCLK Format
--------------------------------------------------------

   This SCLK has two fields -- seconds and subseconds defined by the
   clock tick rate. The clock used 32-bit seconds and 16-bit subseconds.

      SSSSSSSSSS:FFFFF

   where:

      SSSSSSSSSS -- count of on-board seconds

      FFFFF   -- count of fractional seconds


References
--------------------------------------------------------

   1. SCLK Required Reading Document

   2. NAIF's feedback ``Notes on clps_to2im_im1_v01.txt''

 
Kernel data
--------------------------------------------------------
This file is a SPICE spacecraft clock (SCLK) kernel. This file
was generated by the NAIF MOSPICE utility program MAKCLK, version
5.1.0, 26-OCT-2021. Please refer to the SCLK Required Reading
file, NAIF document number 222, and the MAKCLK User's Guide, NAIF
document number 267, for information regarding this kernel file.
 
\begindata

SCLK_KERNEL_ID           = ( @2024-12-04/17:49:19.33 )

SCLK_DATA_TYPE_370011        = ( 1 )
SCLK01_TIME_SYSTEM_370011    = ( 2 )
SCLK01_N_FIELDS_370011       = ( 2 )
SCLK01_MODULI_370011         = ( 4294967296 65536 )
SCLK01_OFFSETS_370011        = ( 0 0 )
SCLK01_OUTPUT_DELIM_370011   = ( 2 )

SCLK_PARTITION_START_370011  = ( 4.98894184120320E+13 )

SCLK_PARTITION_END_370011    = ( 2.81474976710655E+14 )

SCLK01_COEFFICIENTS_370011   = (
 
    0.00000000000000E+00     7.61252111889000E+08     1.00000000000000E+00
    3.80370944000000E+08     7.61257915889000E+08     1.00000164087821E+00
    3.04948183040000E+10     7.61717426643000E+08     9.35600006580353E-01
    3.04954736640000E+10     7.61717435999000E+08     1.00000164315713E+00
    3.50023843840000E+10     7.61786206112000E+08     9.88700008392334E-01
    3.50030397440000E+10     7.61786215999000E+08     1.00000164034000E+00 )

\begintext