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Exploration of small bodies, namely comets and asteroids remain a challengingendeavor due to their low gravity. The risk is so high that missions such asHayabusa II and OSIRIS-REx will be performing touch and go missions to obtainsamples. The next logical step is to perform longer-term mobility on thesurface of these asteroid. This can be accomplished by sending small landers ofa 1 kg or less with miniature propulsion systems that can just offset the forceof asteroid gravity. Such a propulsion system would ideally be used to hop onthe surface of the asteroid. Hopping has been found to be most efficient formof mobility on low-gravity. Use of wheels for rolling presents substantialchallenges as the wheel can't gain traction to roll. The Asteroid Mobile Imagerand Geologic Observer (AMIGO) utilizes 1 kg landers that are stowed in a 1UCubeSat configuration and deployed, releasing an inflatable that is 1 m indiameter. The inflatable is attached to the top of the 1U lander, enabling highspeed communications and a means of easily tracking lander from an overheadmothership. Milligravity propulsion is required for the AMIGO landers toperform ballistic hops on the asteroid surface. The propulsion system is usedto navigate the lander across the surface of the asteroid under the extremelylow gravity while taking care to not exceed escape velocity.Although theconcept for AMIGO missions is to use multiple landers, the more surface areaevaluated by each lander the better. Without a propulsion system, each AMIGOwill have a limited range of observable area. The propulsion system also servesas a rough attitude control system (ACS), as it enables pointing and regulationover where the lander is positioned via an array of MEMS thrusters.

A Milli-Newton Propulsion System for the Asteroid Mobile Imager and Geologic Observer (AMIGO)