  The DART spacecraft is planned to impact the secondary of the binary asteroid
(65803) Didymos in 2022, to assess deflection strategies for planetary defense.
The impact will create a crater and release asteroidal material, some of which
will escape the Didymos system. Because the closest point of approach of
Didymos to Earth's orbit is only 6 million km (about 16 times the Earth-Moon
distance), some ejected material will make its way sooner or later to our
planet, and the observation of these particles as meteors would increase the
scientific payout of the DART mission. The DART project may also represent the
first human-generated meteoroids to reach Earth, and a test case for human
activity on asteroids and its eventual contribution to the meteoroid
environment and spacecraft impact risk. This study examines the amount and
timing of the delivery of meteoroids from Didymos to near-Earth space. Very
little DART-ejected material will reach our planet, and most only after
thousands of years. But some material, the smallest particles and/or those
ejected at the highest velocities could be delivered to Earth-crossing
trajectories almost immediately, though at very low fluxes. Timing and radiant
directions for material reaching the Earth are calculated, though the detection
of substantial numbers would indicate more abundant and/or faster ejecta than
is expected. The DART impact will also create a new meteoroid stream, though
probably not a very dense one. However, larger, more capable asteroid impactors
could create meteoroid streams in which the particle flux exceeds that
naturally occurring in the Solar System, with implications for spacecraft
safety.
