Juice Uses Earth Gravity to Boost Speed by 3.5 km/s for Jupiter Mission
ESA's Juice spacecraft executed a successful gravity assist near Earth on September 28, 2026, increasing its speed by 3.5 km/s and altering its trajectory by 20 degrees. This maneuver, which required minimal fuel, is a critical step in its journey to study Jupiter's icy moons, with a final Earth pass scheduled for 2029 and Jupiter arrival in 2031.
Key points
- Juice passed 8,640 km above the Indian Ocean on September 28, 2026, using Earth's gravity to boost its speed by 3.5 km/s and change its course by 20 degrees.
- The maneuver required only one small course correction out of six planned opportunities, demonstrating high navigation precision and conserving fuel for future operations.
- The flyby allowed scientists to test and calibrate Juice's instruments using Earth as a target, with images of Africa, Madagascar, and the Moon captured by the NavCam.
- Juice will make a final Earth flyby in January 2029 before arriving at Jupiter in July 2031, where it will study the moons Ganymede, Europa, and Callisto.
- The spacecraft will enter orbit around Ganymede in 2034, becoming the first spacecraft to orbit a moon other than Earth's.
Background
Juice launched in April 2023 and has already used gravity assists at the Moon and Venus. The September 2026 Earth flyby was the third major gravity assist of the mission, following the 2024 lunar-Earth flyby and the 2025 Venus flyby. Previous coverage highlighted the importance of these maneuvers for conserving fuel and adjusting trajectories for the long journey to Jupiter.
How outlets are covering it
All three sources agree on the core facts of the gravity assist: the 20-degree trajectory change, 3.5 km/s speed increase, and minimal fuel usage. The Times of India emphasizes the precision of the navigation planning, noting only one course correction was needed. Scientific American highlights the scientific value of the flyby, particularly the testing of instruments and the capture of images of Earth and the Moon. ScienceDaily focuses on the broader mission strategy, including the upcoming 2029 Earth flyby and the long-term goal of studying Jupiter's icy moons for signs of life. No significant disagreements were found among the outlets.
Why it matters
The successful gravity assist is crucial for Juice's mission to study Jupiter's icy moons, which are potential habitats for life. By conserving fuel, the spacecraft can perform detailed observations and enter orbit around Ganymede in 2034. The maneuver also provides valuable data for calibrating instruments, ensuring they are ready for the complex scientific campaign at Jupiter.
What to watch
Juice will continue its journey to Jupiter, with a final Earth flyby scheduled for January 2029. The spacecraft is expected to arrive at Jupiter in July 2031 and enter orbit around Ganymede in 2034. Scientists anticipate releasing high-resolution images and data from the flyby in the coming weeks.
- ESA's Jupiter-bound spacecraft changed direction by 20 degrees and gained 3.5 km/s in speed using Earth’s The Times of India
- ESA's Jupiter-bound spacecraft changed direction by 20 degrees and gained 3.5 km/s in speed using Earth’s gravity; ESA’s Juice spacecraft needed no major engine burn for the boost The Times of India
- See the cool photos this Jupiter-bound spacecraft took while swinging by Earth Scientific American
- ESA’s Juice just used Earth as a slingshot to Jupiter ScienceDaily
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Read on The Times of India