JUICE Spacecraft Set for Critical Earth Flyby Next Week
The European Space Agency's JUICE spacecraft will perform a gravity-assist flyby of Earth on September 28, passing within 8,640 kilometers. This maneuver will adjust its trajectory toward Jupiter, following a previous lunar-Earth flyby and a Venus swing-by. The spacecraft will briefly enter Earth's shadow, requiring some instruments to be powered down, but will continue collecting data on Earth and the Moon.
This is JUICE's third major gravity assist, following the August 2024 lunar-Earth flyby and an August 2025 Venus swing-by. The maneuver adjusts velocity and angle, preserving fuel for orbital insertion at Jupiter in 2031 and Ganymede in 2034. Six course-correction slots were reserved, but only one small adjustment proved necessary.
During the pass, JUICE will enter Earth's shadow, forcing battery power and instrument shutdowns. Still, it will collect data on Earth and the Moon over ten days, including studying Earth's magnetotail and testing a new horizon-tracking technique for its navigation camera. The team notes this flyby is operationally simpler than the 2024 double flyby, allowing flexible instrument pointing.
This flyby could bolster public confidence in long-duration robotic missions, demonstrating precise interplanetary navigation. The data collected on Earth's magnetotail may improve our understanding of space weather, which affects satellites and power grids. Success could also encourage further international collaboration in deep-space exploration, potentially inspiring students and researchers. However, the mission's ultimate payoff depends on the 2031 arrival, so immediate societal impact remains limited to scientific and educational spheres.