Micro- and nanolander on the surface of Ryugu – Commonalities, differences and lessons learned for future microgravity exploration

Recent Space missions to the small bodies in our Solar System have shown an increasing importance of in-situ investigations. Philae, the comet lander of the ESA Rosetta mission performed the first landing on such a small body and its results clearly enhanced the overall scientific output of the Rosetta mission. While Philae was a rather heavy (~100 ​kg), very complex (and comparably expensive) lander, significant scientific results can be obtained also with much smaller devices. This has not least been demonstrated by the Hayabusa2 mission, delivering the MINERVA II and MASCOT landers to the surface of (162173)Ryugu. In this paper we will compare the benefits (and drawbacks) of surface packages in the 10 ​kg and 10 cubic decimeter class (MASCOT-Type) with the smaller (volume ~1 cubic decimeter and mass