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Welcome to the assist wiki!

You access the ephemeris files adding equivalent versions of these lines to your .bash_profile .

export REB_DIR=/Users/mholman/rebound

export REBX_DIR=/Users/mholman/reboundx

export ASSIST_DIR=/Users/mholman/assist

export JPL_PLANET_EPHEM=/Users/mholman/reboundx/examples/ephem_forces/linux_m13000p17000.441
export JPL_SB_EPHEM=/Users/mholman/reboundx/examples/ephem_forces/sb441-n16.bsp

You can download the DE441 ephemeris file here:

https://ssd.jpl.nasa.gov/ftp/eph/planets/Linux/de441/linux_m13000p17000.441

You can find the SPK files and documentation here:

ftp://ssd.jpl.nasa.gov/pub/eph/small_bodies/asteroids_de441/