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 )