GOMX-4B
GOMX-4B was a technology demonstration CubeSat operated by the European Space Agency (ESA) and the Danish company GomSpace in low Earth orbit between 2018 and 2023. It successfully demonstrated various technologies related to small satellite constellations while flying in tandem with the GOMX-4A CubeSat, developed by GomSpace for the Danish Ministry of Defence's surveillance of the Arctic.