What is SPICE ?SPICE is a framework to deal with ancillary information of space science data developed by Navigation Ancillary Information Facility (NAIF). The most fundamental ancillary information is clock, trajectory, and orientation of spacecraft. For scientific purpose, planetary constant, trajectories, or rotation is also essential to their analysis. In SPICE, the ancillary data, not only of spacecrafts, but also of planetary objects is archived into SPICE specific format, called SPICE kernel(s).
The "HAYABUSA" project and the "KAGUYA" project provide SPICE kernels and the "AKATSUKI" project is also planning to open in the SPICE format.