If you are not already familiar with how to use SPICE data, take a moment to read about using SPICE data.
Three categories of SPICE data, often referred to as kernels, are available from this website. You should carefully read about these categories in order to find the best data for your needs.
- PDS Archived SPICE Data Sets
- Operational Flight Projects Kernels and Other Non-archived Project Kernels
- Generic Kernels
All "PDS Archived SPICE Data Sets" are suitable for use in research proposals made in response
to NASA's ROSES or similar research programs.
regarding accessing all three categories of SPICE data is available from the NAIF server.
CAUTION: always download needed text kernels--do not CUT/PASTE the text
kernel contents displayed in your browser into a text editor and save
that as your text kernel. (CUT/PASTE may insert extraneous, unseen
characters in your new text kernel that will render it unusable.)