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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/assist/data/linux_m13000p17000.441
export JPL_SB_EPHEM=/Users/mholman/assist/data/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/sb441-n16.bsp
By default, the code looks for the ephemeris files in the assist/data directory, unless the environment variables are set differently, as above.