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The ESA Restores Communications with JUICE at Venus

September 4, 2025
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The ESA Restores Communications with JUICE at Venus
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The ESA’s JUpiter Icy Moons Explorer (JUICE) is on its technique to conduct detailed research of Jupiter and its three icy moons, Ganymede, Callisto, and Europa. To select up velocity and attain Jupiter by July 2031, the probe will conduct a gravity-assist maneuver with Venus on Sunday, August thirty first. According to the ESA, the mission suffered an anomaly with its communications system, which briefly severed its reference to Earth. Fortuitously, a coordinated response by groups on the ESA’s European Space Operations Centre (ESOC) and Airbus (JUICE’s producer) restored communications in time for the probe’s flyby.

The anomaly occurred when a ground-based antenna within the ESA’s Deep Area Community failed to determine contact on July sixteenth. A fast diagnostic decided that the problem was not with the bottom station, main the JUICE staff at ESOC to worry that a number of techniques had failed, prompting the probe to enter survival mode. When this occurs, the spacecraft begins to spin and its antenna (which can sweep throughout Earth as soon as an hour) to transmit an intermittent sign. Since no sign was detected, the 2 groups started wanting into the communications subsystem for indications of issues or misalignment.

As Angela Dietz, Juice Spacecraft Operations Supervisor, defined in an ESA press release:

Dropping contact with a spacecraft is likely one of the most severe situations we will face. With no telemetry, it’s way more tough to diagnose and resolve the foundation explanation for a difficulty. Ready was not an choice. We needed to act quick. Ready two weeks for the reset would have meant delaying necessary preparations for the Venus flyby.

To resolve the problem, the staff may await the following computerized reset, which was fourteen days away. Alternately, they might attempt blind messaging – sending instructions within the course of JUICE and hope they had been obtained by one among its backup low-gain antennas. This latter strategy posed a problem since JUICE was about 200 million km (125.25 million mi) from Earth and on the opposite aspect of the Solar on the time, which imposes a communications lag of twenty-two minutes to ship and obtain a sign. Restoration makes an attempt lasted virtually 20 hours straight, with the groups working by the night time, and so they ultimately obtained a response.

The blind instructions activated the spacecraft’s sign amplifier (which boosts JUICE’s alerts), and speak to was re-established. The groups discovered that JUICE was in good working circumstances, that no techniques had failed, and the spacecraft was nonetheless on observe to make its flyby with Venus. Additionally they decided that the anomaly was brought on by a timing situation with the software program that switches the sign amplifier on and off. Stated Dietz:

It was a delicate bug, however one which we had been ready to analyze and resolve. We have now recognized plenty of potential methods to make sure that this doesn’t occur once more, and we are actually deciding which resolution can be the very best to implement. This was a textbook instance of teamwork beneath stress. Because of the staff’s calm and methodical strategy, we had been capable of recuperate Juice with none lasting impression on the mission.

Timeline of JUICE's journey to Jupiter and its moons. Credit: ESA Timeline of JUICE’s journey to Jupiter and its moons. Credit score: ESA

JUICE will make its closest strategy to Venus at 07:28 CEST on Sunday, August thirty first (01:28 EST; 10:28 PST, Aug. thirtieth), one among 4 deliberate gravity-assist maneuvers. The primary occurred in August 2024 when JUICE made a flyby with the Earth-Moon system, and two extra will happen with Earth in September 2026 and January 2029. These maneuvers are obligatory since JUICE is likely one of the heaviest interplanetary spacecraft ever launched (6000 kg; 13230 lbs). The approaching flybys can even modify the probe’s trajectory so that it’ll rendezvous with Jupiter in July 2031.

Additional Studying: JUICE



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