JUICE Thermal Architecture and Performance



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47th International Conference on Environmental Systems


JUICE - JUIpiter ICy moons Explorer - is the first large-class mission in ESA's Cosmic Vision programme. Planned for launch in 2022 and arrival at Jupiter in 2030, it will spend at least three years making detailed observations of Jupiter and three of its largest moons, Ganymede, Callisto and Europa. It addresses the question of whether possible habitats of life are provided underneath the surfaces of the icy satellites and also probes Jupiter’s atmosphere and magnetosphere.

One of the main drivers is the low solar illumination received at Jupiter, that drives both the size and technology of the solar arrays, and the thermal control, that is designed to cope with a hot and cold environments.

JUICE spacecraft thermal control is characterized by several requirements such as a large variations of spacecraft external environment during the mission (Solar constant decreasing from 3342 W/m² closer to Sun than Venus down to 46 W/m² in Jovian environment), high planet flux during Venus flyby and Jupiter and Ganymede combined shadowing which generates long eclipse of up to 4.8 hours. The thermal design objective is then to provide the spacecraft with the flexibility required to achieve its operations throughout the whole range of specified environments and attitudes. The JUICE thermal control is designed with the objective to minimize the impact of the external environment changes on the spacecraft units and subsystems, to control heat loads/leaks from appendages (High Gain Antenna, Launch Vehicle Adapter and Solar Generator) through high efficiency Multi-Layers Insulation . Minimize heating power demand especially during science and communication phases and minimizing hardware mass is a constant concern and solutions are found to build to a maximum extent a robust and passive design supplemented by heaters including innovative solution when mass efficiency is demonstrated with reasonable complexity.


Romain Peyrou-Lauga, European Space Agency (ESA), Netherlands
ICES101: Spacecraft and Instrument Thermal Systems
The 47th International Conference on Environmental Systems was held in South Carolina, USA on 16 July 2017 through 20 July 2017.


thermal, spacecraft, system