KPL/SCLK Magellan "fictitious" SCLK Kernel -------------------------------------------------------- This file contains the data necessary to convert between the 'fictitious' Magellan on-board clock and ephemeris time. NAIF suggests that you do not modify this file. If you do modify it, be sure to indicate this in the `Version' section below. Version -------------------------------------------------------- Version 1.0.0 -- March 22, 2006 Implementation notes -------------------------------------------------------- This SPICE SCLK file is constructed so that valid SCLK strings are simply the number of seconds and milliseconds that have passed since the UTC epoch 1989-05-04 00:00:00 (which is the midnight of the day when Magellan spacecraft was launched.) Thus 288929292.827 simply represents the epoch that occurs 288929292 seconds and 827 milliseconds past the UTC epoch May 4, 1989. Note that the number in the right field of the SCLK string is always treated as milliseconds. For example, the SCLK string 1.10 does not mean one and one tenths of a second but means one seconds and ten milliseconds. For all time, the clock runs at the same rate as Terrestrial Dynamical Time (TDT). There is only one partition for this clock. You must load this file into the kernel pool before using any of the SPICELIB SCLK routines. The code fragment CALL FURNSH ( < 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 FURNSH ( < 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-MAR-2006 ) SCLK_DATA_TYPE_18 = ( 1 ) SCLK01_TIME_SYSTEM_18 = ( 1 ) SCLK01_N_FIELDS_18 = ( 2 ) SCLK01_MODULI_18 = ( 1000000000 1000 ) SCLK01_OFFSETS_18 = ( 0 0 ) SCLK01_OUTPUT_DELIM_18 = ( 1 ) SCLK_PARTITION_START_18 = ( 0.0000000000000E+00 ) SCLK_PARTITION_END_18 = ( 1.00000000E+14 ) SCLK01_COEFFICIENTS_18 = ( 0.00000000E+00 @1989-05-04-00:00:56.185 1 ) CK_-18000_SCLK = -18 CK_-18000_SPK = -18 \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