Juice Spacecraft Performs Earth Flyby to Calibrate Tools
The spacecraft captured 740 images of Earth while refining its trajectory toward Jupiter during the flyby event.
Updated on Oct. 16, 2026 in Space
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On 28 September 2026, the Juice spacecraft completed a gravity-assist flyby of Earth to adjust its trajectory toward Jupiter. During the maneuver, the craft used its JANUS camera to capture 740 images of Earth and the Moon.
Why it matters
This flyby provided a critical real-world testing environment for the spacecraft's scientific instruments as it prepares for its long-duration mission in the Jovian system. Calibrating these sensors now ensures the hardware performs as intended during upcoming deep-space observations.
The JANUS camera utilized 13 colour filters to acquire imagery with a pixel resolution ranging from 150 meters to 375 meters. The resulting strip, spanning 250 to 300 kilometers in width, was captured as the spacecraft passed 8640 km above the Indian Ocean.
The players
Juice
An interplanetary spacecraft designed to study Jupiter and its icy moons through remote sensing and geophysical analysis.
JANUS
The optical camera system aboard Juice capable of multi-spectral imaging to characterize the surfaces and atmospheres of celestial bodies.
The details
The spacecraft utilized Earth's gravitational pull to refine its velocity and heading, effectively altering its trajectory for the multi-year journey to Jupiter. The JANUS camera system operated over a six-day window, employing specific colour filter sequences to process optical data. These filters, combined with the craft's motion relative to the planet, allowed researchers to test the imaging pipeline across a diverse path extending from Madagascar to the Gulf of Guinea.
Timeline
27 September 2026, 23:00 CEST: JANUS camera began operation.
28 September 2026, 13:45 CEST: Closest approach of flyby at 8640 km.
28 September 2026, 13:46-13:50 CEST: Science camera recorded photos of Earth.
2 October 2026, 10:40 CEST: JANUS camera concluded operation.
The Tech Race
This maneuver follows the established flight path of the European Space Agency's Jupiter Icy Moons Explorer mission to reach the Jovian system. It marks a departure from static lab testing, moving into active instrument validation during interplanetary transit.
This event confirms the spacecraft's imaging capabilities for scientists tracking the progress of the long-term mission. No hardware or consumer software changes result from this testing phase.
The takeaway
This successful instrument test demonstrates that the spacecraft is functioning within its parameters while en route to its destination. Researchers will now monitor subsequent telemetry to ensure continued calibration as the mission progresses toward Jupiter.
Further reading
For broader updates on interplanetary transit technology, explore the latest Space reports.
Source note: This article includes information reported by European Space Agency (ESA).
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