The use of small satellites (Cubesat) is gaining great success in the New Space Economy thanks to their small size, low cost and reduced development time. Cubesat were born in university but are now universally used. The miniaturized technologies of these small satellites are having a big development and are used even for complex missions, which include proximity maneuvers, relative navigation, observations and interplanetary transfers. One of these innovative missions involves the release of a Cubesat 12U (size 20 cm x 20cm x 30 cm), with a weight of around 20 kg, by 'Space Rider' (a new transport system and re-entry, developed by Thales-Alenia for ESA) in low-Earth orbit and the subsequent re-entry of the Cubesat into the cargo bay of Space Rider, after making observations of the outer surface of the vehicle.