  The exploration of small body asteroids provides direct access to the
primitive building blocks of our solar system. Sample and return missions
enable chemical and radioisotope studies which not only provide evidence for
the formation of the solar system, but also a basic understanding of where
resources might be found for future exploitation. The touch-down and sample
techniques established by Hayabusa-2 and OSIRIS-REx accomplish this mission by
physically touching down on the asteroid and collecting samples into a basket
extended via a probe from the bottom of the spacecraft. This technique has been
demonstrated to work, but contains a high cost in both mission operations as
well as the size and complexity of the collection mechanism itself. This paper
explores an alternative sample and return technique by exploiting the recent
discovery of regolith particle ejections from Bennu. Particles ejected from the
surface of Bennu are typically 1 cm in size and spend several hours in flight,
suggesting the possibility that nanospacecraft deployed from the
mother-spacecraft could chase down, collect and return with the sample with
minimal sensor and delta-V capability. Key aspects of this mission are
developed to reduce risk, and an overall mission concept is developed to
establish plausibility.
