Need help recreating Cassini trajectory description from SKYMAP trj file

In an application I have to analyse I found this trajectory description for the space probe cassini, unfortunately header and comments have been removed:

2004 6 01 00.0 16669287.46 -13098482.32 -10225933.05 1313468.24

The file format is .trj / .traj. Supposedly, there was a tool called SKYMAP which created these? I would like to know which tool created this data set. From the source code I gather that the table is in the format

year month day hour ignore x y z

The column ignore is ..ignored. I tried to recreate the output with JPL's horizons system but it does not quite fit.

edit: When we develop the application further I want it to be ready for future space missions. I might replace the trajectory description completely. I know asking for opinions is frowned upon, but what would you choose: spice toolkit or horizons toolkit? The spice toolkit seems more extensive and well-kept.

• You may have more luck with naif.jpl.nasa.gov/pub/naif/CASSINI/kernels/spk/aareadme.txt and the directory that contains it.
– user7073
Dec 11 '17 at 14:39
• I have -1.309744668548817E+07, -1.022795628362075E+07, 1.313137771804283E+06 in an old Horizons download. Your numbers are different by about 2300 km. That's bigger than the light-time difference (~ 300km), but smaller than the difference between barycentric and sun-centered (~65,000km), so dunno.
– uhoh
Dec 11 '17 at 17:37