After an overview of the progress that have been made in small spacecraft for planetary exploration, two planetary mission studies utilizing small spacecraft technologies are presented. HYPATIA is a proposed mission that would demonstrate the use of planetary balloon and water electrolysis technology on the Martian northern polar cap. The combination of both technologies allows a small science payload to be landed repeatedly and carried across the polar terrain. HYPATIA consists of a small gondola under a metallised Mylar balloon filled with hydrogen from the polar ice. SIREN is a proposed mission concept that would demonstrate the use of small spacecraft at the rings of Saturn to quantify the ring environment and study the composition and dynamics of the ring particles. SIREN consists of several daughtercraft deployed from and networked to a mothership in hover-orbit over the ring plane. Many existing small spacecraft technologies are leveraged to make these missions possible
