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We present a model for the configuration of noninteracting material that isejected in a continuous manner from an atmosphereless gravitating body for agiven distribution of sources. The model is applicable to material on bound orunbound trajectories and to steady and nonsteady modes of ejection. For a jetthat is inclined to the surface normal, we related the distributions ofejection direction, velocity, and size to the phase-space number density at thedistance from the source body. Integrating over velocity space, we obtained anexpression from which we inferred the density, flux, or optical depth of theejected material. As examples for the application of the code, we calculateprofiles of the dust density in the Enceladus plume, the pattern of massdeposition rates around a plume on Europa, and images of optical depthfollowing the nonstationary emission of material from a volcano on Io. We makethe source code of a Fortran-95 implementation of the model freely available.

Two-body model for the spatial distribution of dust ejected from an atmosphereless body