JMO is currently planned to be launched in 2019 or 2020, attached to its mother spacecraft, the Jupiter and Trojan asteroid explorer. It will be inserted into Jupiter orbit in 2026 following its separation from the Jupiter and Trojan asteroids exploration.
As of 2007, the spacecraft was slated for a lift-off in 2020 together with ESA's Jupiter Ganymede Orbiter (JGO) from which it will undock upon its arrival at Jupiter in 2025/2026. JMO was planned to undertake detailed in-situ studies of the magnetosphere of Jupiter as a template for an astrophysical magnetised disk and affording the opportunity for “3-point” investigations of the Jupiter system via synergistic observations with JGO and NASA's Jupiter Europa Orbiter (JEO).
The size and weight of the JMO is extremely limited since it has to fit inside its carrier spacecraft. Due to this, the JMO can only carry up to 10 kg of payloads, allowing it to have only 2 to 3 scientific instruments. No matter what kind of innovative technology is available, it is impossible to conduct in situ observations with such a limited number of instruments. In order to solve the mysteries of the Jovian magnetosphere effectively with limited instruments, and to conduct observations never made before, the space craft will have a X-ray imaging spectroscope, featuring different wavelengths from instruments onboard NASA's Juno probe.