  The number density and flux of a meteoroid stream is enhanced near a massive
body due to the phenomenon known as gravitational focusing. The greatest
enhancement occurs directly opposite the massive body from the stream radiant:
as an observer approaches this location, the degree of focusing is unbound for
a perfectly collimated stream. However, real meteoroid streams exhibit some
dispersion in radiant and speed that will act to eliminate this singularity. In
this paper, we derive an analytic approximation for this smoothing that can be
used in meteoroid environment models and is based on real measurements of
meteor shower radiant dispersion.
