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Restricted three-body codes have a proven ability to recreate much of thedisturbed morphology of actual interacting galaxies. As more sophisticatedn-body models were developed and computer speed increased, restrictedthree-body codes fell out of favor. However, their supporting role forperforming wide searches of parameter space when fitting orbits to real systemsdemonstrates a continuing need for their use. Here we present the model andalgorithm used in the JSPAM code. A precursor of this code was originallydescribed in 1990, and was called SPAM. We have recently updated the softwarewith an alternate potential and a treatment of dynamical friction to moreclosely mimic the results from n-body tree codes. The code is released publiclyfor use under the terms of the Academic Free License (AFL) v.3.0 and has beenadded to the Astrophysics Source Code Library.

JSPAM: A restricted three-body code for simulating interacting galaxies