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Other Voyager SPICE KernelsSPICE kernels contain critical information about the geometry, pointing, and timing of NASA's spacecrafts. For more information about SPICE visit the home page of PDS's Navigation and Ancillary Information Facility (NAIF). Leap Seconds Kernel (LSK)This file tabulates leap seconds, allowing for the converson between Universal Time and Ephemeris Time. Planetary Constants Kernel (PCK)This file tabulates parameters about planetary bodies including names, sizes, shapes and rotation models. Spacecraft Clock Kernels (SCLK)This file records the relationship between the Voyager spacecraft clocks (also known as the Flight Data System or FDS Count). Note that, in its most complete form, the Voyager FDS Count is written as follows:
hhhhh is the "FDS hour", ranging from 0 to 65535. One FDS hour equals 48 actual minutes. Because of the limit of 65536, the clock turns over approximately every 6 years. p is the "partition number", which was incremented each time the clock turned over. The partition number was 2 at Jupiter and Saturn, 3 at Uranus, and 4 at Neptune. mm is the "FDS minute", ranging from 0 to 59. One FDS minute equals 48 actual seconds. sss is the "FDS second", ranging from 1 to 800 (not 0 to 799). One FDS second equals 0.06 actual seconds. Frames Kernels (FK)These files document the relationship between the fields of view of the different instruments on the scan platform. Note that you will need the frames kernel in order to use any of the C (pointing) kernels provided. Instrument Kernels (IK)These files document the shapes, sizes and pixel dimensions of various instrument fields of view.
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