KPL/SCLK
\begintext
LABEL_START
FILENAME ="near_171.tsc"
MISSION_NAME ="NEAR"
ORGANIZATION = "JHU/APL"
AUTHOR ="SCLK update program"
CONTACT ="david.tillman@jhuapl.edu"
TYPE ="SCLK"
CREATION_DATE ="12-Feb-2001"
TARGET ="N/A"
START_UTC ="1996-02-17T20:43:29"
END_UTC ="N/A"
END_DET_UTC ="N/A"
SOURCE_FILES ={de403.bsp,
eros9845.bsp,
near_1998356_2000045_v01.bsp,
near_2000045_2000125_v02.bsp,
near_2000121_2000189_v01_noburn.bsp,
near_2000181_2000242_v01.bsp,
near_2000223_2000270_v01.bsp,
near_2000265_2000298_v01.bsp,
near_2000294_2000309_v01_noburn.bsp,
near_2000302_2000341_v01.bsp,
near_2000336_2001028_v01.bsp,
near_2001026_2001043_v01.bsp,
near_2001035_2001043_v01.bsp,
naif0007.tls,
pck00006.tpc,
near_170.tsc}
MERGED_FILES ="N/A"
NUMBER_VERTICES ="N/A"
NUMBER_PLATES ="N/A"
DESCRIPTION ="
This kernel uses a least-squares fit to the clock data from Nov. 1996
to December 1997, using a constant drift rate of -0.0164 seconds/day.
Coefficients covering the period January 1998 through end of mission
are produced by the SCLK Kernel Update utility on an automatic basis.
This kernel also includes the effects of time changes sent to the
spacecraft clock during a test on May 30, 1997, and during the
Mathilde flyby on June 27, 1997. All of these time changes were
cancelled by later time changes, so that the spacecraft clock was
set back to its original timeline.
For the final touchdown of NEAR on Eros on 12 Feb 2001, the clock
was set backwards 17 seconds. A new partition was added to
reflect this.
This will be the final kernel produced for the NEAR mission. "
LABEL_END
FREE FORM COMMENTS:
Specification for a type 1 SCLK...
Model the SCLK against the time system TDT (terrestrial
dynamical time) TIME_SYSTEM = 2; variable names
indicate NEAR (ID -93).
This kernel was rebuilt on Tue Dec 8 20:22:10 1998
starting from encoded SCLK: 59023003498 as build number: 1
This kernel was rebuilt on Thu Jan 28 14:59:12 1999
starting from encoded SCLK: 92272635009 as build number: 2
\begindata
SCLK_KERNEL_ID = ( @2001-02-12T19:00:03 )
SCLK_DATA_TYPE_93 = ( 1 )
SCLK01_TIME_SYSTEM_93 = ( 2 )
\begintext
For NEAR, Use a single field which represents milliseconds past
mission start time; moduli set well beyond end of mission.
\begindata
SCLK01_N_FIELDS_93 = ( 1 )
SCLK01_MODULI_93 = ( 2.0e+12 )
SCLK01_OFFSETS_93 = ( 0 )
SCLK01_OUTPUT_DELIM_93 = ( 1 )
\begintext
Supply the partition information. If needed,
(e.g., switch to backup bus controller occurs), can
add additional records (lines) to following variables to
define new partitions; generally, the start of the
new partition should coincide with the end of the
previous one.
\begindata
SCLK_PARTITION_START_93 = ( 0.0000000000e+00
4.0409661942e+10
4.0429229946e+10
4.2793916398e+10
4.2808703400e+10
4.2831583405e+10
1.5741315200e+11
)
SCLK_PARTITION_END_93 = ( 4.0409721942e+10
4.0429169946e+10
4.2793906398e+10
4.2808704400e+10
4.2831592405e+10
1.5741316900e+11
2.0000000000e+12
)
\begintext
Finally, define coefficients for starting MET (millisec),
starting TDT (expressed in terms of date/time string
@dd-mmm-yyyy-HH:MM:SS) and rate of change between the
spacecraft clock and TDT, having the following property:
rate = TDT (sec) / most significant count (millisec)
For NEAR, the most significant count corresponds to 1/1000 of
a second, giving a rate of 0.001 sec/millisec in the absence
of clock drift; in general, rate is related to the MET drift
rate of the spacecraft clock (in millisec/sec) as follows:
rate = {1+MET drift rate (millisec/sec)/1000} / 1000
The following are preliminary data; additional records (lines) should
be added as needed to account for changes in clock drift over time;
the new records must ensure a continuous and monotonically
increasing relationship between MET and TDT.
\begindata
SCLK01_COEFFICIENTS_93 = (
0.0000000000e+00 @17-FEB-1996-20:44:30.960 9.9999980900e-04
4.0409721942e+10 @30-MAY-1997-13:39:45.184 9.9999980900e-04
4.0429229946e+10 @30-MAY-1997-19:04:53.184 9.9999980900e-04
4.2793906398e+10 @27-JUN-1997-03:56:09.184 9.9999980900e-04
4.2808694400e+10 @27-JUN-1997-08:02:37.184 9.9999980900e-04
4.2831583405e+10 @27-JUN-1997-14:24:06.184 9.9999980900e-04
6.0125985000e+10 @13-JAN-1998-18:24:04.310 9.9999979941e-04
6.0212390000e+10 @14-JAN-1998-18:24:09.280 9.9999965456e-04
6.0515927000e+10 @18-JAN-1998-06:43:06.180 9.9999967129e-04
6.0760157000e+10 @21-JAN-1998-02:33:36.105 9.9999969185e-04
6.1092948000e+10 @24-JAN-1998-23:00:07.008 9.9999970879e-04
6.1253334000e+10 @26-JAN-1998-19:33:12.956 9.9999967631e-04
6.1373467000e+10 @28-JAN-1998-04:55:25.916 9.9999966669e-04
6.1594465000e+10 @30-JAN-1998-18:18:43.841 9.9999966090e-04
6.6859033000e+10 @01-APR-1998-16:41:29.880 9.9999962751e-04
7.2308626000e+10 @03-JUN-1998-18:28:01.519 9.9999975022e-04
7.4721547000e+10 @01-JUL-1998-16:43:21.823 9.9999971165e-04
7.5132721000e+10 @06-JUL-1998-10:56:15.686 9.9999966728e-04
7.5328509000e+10 @08-JUL-1998-17:19:23.626 9.9999969335e-04
7.7738193000e+10 @05-AUG-1998-14:40:46.895 9.9999969645e-04
7.8777422000e+10 @17-AUG-1998-15:21:15.572 9.9999968889e-04
7.8952916000e+10 @19-AUG-1998-16:06:09.527 9.9999974263e-04
7.9588468000e+10 @27-AUG-1998-00:38:41.368 9.9999975051e-04
8.0154353000e+10 @02-SEP-1998-13:50:06.221 9.9999974042e-04
8.1317059000e+10 @16-SEP-1998-00:48:31.925 9.9999974566e-04
8.1805260000e+10 @21-SEP-1998-16:25:12.798 9.9999973960e-04
8.2139807000e+10 @25-SEP-1998-13:20:59.695 9.9999969034e-04
8.2432241000e+10 @28-SEP-1998-22:34:53.609 9.9999970785e-04
8.3004321000e+10 @05-OCT-1998-13:29:33.450 9.9999972196e-04
8.3637554000e+10 @12-OCT-1998-21:23:26.279 9.9999972994e-04
8.4815021000e+10 @26-OCT-1998-12:27:52.954 9.9999972383e-04
8.5429701000e+10 @02-NOV-1998-15:12:32.778 9.9999971380e-04
8.5598364000e+10 @04-NOV-1998-14:03:35.735 9.9999974401e-04
8.6208312000e+10 @11-NOV-1998-15:29:23.584 9.9999975251e-04
8.6810662000e+10 @18-NOV-1998-14:48:33.426 9.9999973864e-04
8.7836239000e+10 @30-NOV-1998-11:41:30.153 9.9999973342e-04
8.8228097000e+10 @05-DEC-1998-00:32:28.043 9.9999971986e-04
8.8438735000e+10 @07-DEC-1998-11:03:05.977 9.9999968567e-04
8.8723522000e+10 @10-DEC-1998-18:09:32.894 9.9999970990e-04
8.9167446000e+10 @15-DEC-1998-21:28:16.770 9.9999972121e-04
8.9826627000e+10 @23-DEC-1998-12:34:37.577 9.9999970657e-04
9.0351015000e+10 @29-DEC-1998-14:14:25.418 9.9999969656e-04
9.0508753000e+10 @31-DEC-1998-10:03:23.364 9.9999965725e-04
9.0804879000e+10 @03-JAN-1999-20:18:49.254 9.9999963003e-04
9.0891284000e+10 @04-JAN-1999-20:18:54.125 9.9999850403e-04
9.1051108000e+10 @06-JAN-1999-16:42:38.180 1.0000003417e-03
9.1137521000e+10 @07-JAN-1999-16:42:51.150 9.9999965120e-04
9.1643374000e+10 @13-JAN-1999-13:13:43.967 9.9999963823e-04
9.2098885000e+10 @18-JAN-1999-19:45:34.837 9.9999971539e-04
9.2272972000e+10 @20-JAN-1999-20:07:01.780 9.9999967241e-04
9.2989875000e+10 @29-JAN-1999-03:15:24.550 9.9999967956e-04
9.3630426000e+10 @05-FEB-1999-13:11:15.352 9.9999969096e-04
9.3889558000e+10 @08-FEB-1999-13:10:07.278 9.9999971539e-04
9.4235104000e+10 @12-FEB-1999-13:09:13.188 9.9999974051e-04
9.4507432000e+10 @15-FEB-1999-16:48:01.123 9.9999975952e-04
9.5913077000e+10 @03-MAR-1999-23:15:25.732 9.9999972150e-04
9.6661855000e+10 @12-MAR-1999-15:15:03.495 9.9999968374e-04
9.7087768000e+10 @17-MAR-1999-13:33:36.369 9.9999970449e-04
9.7259103000e+10 @19-MAR-1999-13:09:11.324 9.9999973601e-04
9.8124119000e+10 @29-MAR-1999-13:26:07.102 9.9999974347e-04
9.8740823000e+10 @05-APR-1999-16:44:30.949 9.9999975168e-04
9.9332844000e+10 @12-APR-1999-13:11:31.797 9.9999974315e-04
1.0115632000e+11 @03-MAY-1999-15:42:47.324 9.9999974035e-04
1.0192592400e+11 @12-MAY-1999-13:29:31.118 9.9999973302e-04
1.0270511600e+11 @21-MAY-1999-13:56:02.905 9.9999972622e-04
1.0330746400e+11 @28-MAY-1999-13:15:10.735 9.9999971703e-04
1.0357738900e+11 @31-MAY-1999-16:13:55.653 9.9999969744e-04
1.0428957000e+11 @08-JUN-1999-22:03:36.432 9.9999968955e-04
1.0495320300e+11 @16-JUN-1999-14:24:09.232 9.9999969796e-04
1.0563745000e+11 @24-JUN-1999-12:28:16.031 9.9999970644e-04
1.0615676900e+11 @30-JUN-1999-12:43:34.873 9.9999969499e-04
1.0759866100e+11 @17-JUL-1999-05:15:06.407 9.9999967686e-04
1.0931735300e+11 @06-AUG-1999-02:39:57.784 9.9999963727e-04
1.0988321800e+11 @12-AUG-1999-15:51:02.573 9.9999962675e-04
1.1160191700e+11 @01-SEP-1999-13:16:00.888 9.9999960134e-04
1.1274866800e+11 @14-SEP-1999-19:48:31.393 9.9999956861e-04
1.1444949000e+11 @04-OCT-1999-12:15:32.636 9.9999955513e-04
1.1661321300e+11 @29-OCT-1999-13:17:34.680 9.9999955809e-04
1.1989633300e+11 @06-DEC-1999-13:16:13.361 9.9999959823e-04
1.2007520000e+11 @08-DEC-1999-14:57:20.294 9.9999962694e-04
1.2076756000e+11 @16-DEC-1999-15:16:40.048 9.9999964471e-04
1.2301577300e+11 @11-JAN-2000-15:46:52.289 9.9999966231e-04
1.2378214600e+11 @20-JAN-2000-12:39:45.036 9.9999966955e-04
1.2474293600e+11 @31-JAN-2000-15:32:54.713 9.9999966406e-04
1.2593273100e+11 @14-FEB-2000-10:02:49.319 9.9999966865e-04
1.2855638600e+11 @15-MAR-2000-18:50:23.455 9.9999967057e-04
1.3043917100e+11 @06-APR-2000-13:50:07.829 9.9999966756e-04
1.3118129200e+11 @15-APR-2000-03:58:48.577 9.9999966077e-04
1.3285501400e+11 @04-MAY-2000-12:54:10.014 9.9999966383e-04
1.3328877800e+11 @09-MAY-2000-13:23:33.874 9.9999967655e-04
1.3414737700e+11 @19-MAY-2000-11:53:32.591 9.9999967025e-04
1.3458302500e+11 @24-MAY-2000-12:54:20.442 9.9999965803e-04
1.3527066600e+11 @01-JUN-2000-11:55:01.201 9.9999965024e-04
1.3630773500e+11 @13-JUN-2000-11:59:29.843 9.9999965527e-04
1.3761435000e+11 @28-JUN-2000-14:56:24.387 9.9999965118e-04
1.3933430600e+11 @18-JUL-2000-12:42:19.795 9.9999965580e-04
1.3970032500e+11 @22-JUL-2000-18:22:38.674 9.9999966990e-04
1.4036837700e+11 @30-JUL-2000-11:56:50.448 9.9999966240e-04
1.4096962100e+11 @06-AUG-2000-10:57:34.240 9.9999965383e-04
1.4165723100e+11 @14-AUG-2000-09:57:43.997 9.9999964633e-04
1.4469710800e+11 @18-SEP-2000-14:22:19.927 9.9999964801e-04
1.4625519300e+11 @06-OCT-2000-15:10:24.373 9.9999964470e-04
1.4869368300e+11 @03-NOV-2000-20:31:53.512 9.9999964684e-04
1.4935705700e+11 @11-NOV-2000-12:48:07.273 9.9999963914e-04
1.5033180800e+11 @22-NOV-2000-19:33:57.927 9.9999964463e-04
1.5385793000e+11 @02-JAN-2001-15:02:38.679 9.9999964612e-04
1.5473045800e+11 @12-JAN-2001-17:24:46.375 9.9999965195e-04
1.5579406100e+11 @25-JAN-2001-00:51:29.000 9.9999964722e-04
1.5682978300e+11 @06-FEB-2001-00:33:30.629 9.9999964217e-04
)