The Mars Geyser Hopper is a design reference mission (DRM) for a Discovery-class spacecraft using Advanced Stirling Radioisotope Generator (ASRG) power source.  The Geyser Hopper is a conceptual design mission concept that will investigate the springtime carbon-dioxide geysers found in regions around the south pole of Mars, based on the Mars Phoenix heritage systems and approach,  designed to last over a one-year stay on the South Pole.
Geoffrey A. Landis, Steven R. Oleson, et.al.
National Aeronautics and Space Administration