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Juice’s lunar-Earth flyby: all you could know

July 16, 2024
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Juice’s lunar-Earth flyby: all you could know
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ESA’s Jupiter Icy Moons Explorer (Juice) will return to Earth on 19–20 August, with flight controllers guiding the spacecraft first previous the Moon after which previous Earth itself. This ‘braking’ manoeuvre will take Juice on a shortcut to Jupiter through Venus.

What is going on?

It’s a double world first. The primary-ever lunar-Earth flyby, and the first-ever double gravity help manoeuvre. It would change Juice’s velocity and route to change its course by area, but it surely’s a daring feat; the slightest mistake may take Juice off track and spell the tip of the mission.

Following Juice’s launch in April 2023, this lunar-Earth flyby is step one within the spacecraft’s waltz by the Photo voltaic System on its journey to Jupiter.

Throughout the flyby, Earth will bend Juice’s trajectory by area, ‘braking’ it and redirecting it on track for a flyby of Venus in August 2025. From that second on, the vitality boosts will start, with Juice being whizzed up by Venus after which twice by Earth – the area exploration equal of consuming three back-to-back espressos.

Why does it have to occur?

Jupiter is on common ‘simply’ 800 million km away from Earth. With out an infinite rocket, sending Juice straight to the large planet would require an inconceivable 60 000 kg of onboard propellant. After which Juice would should be carrying an infinite further quantity of propellant to gradual itself down sufficient to enter orbit round Jupiter as soon as it arrives, moderately than merely zipping straight previous and off into outer area.

So Juice is taking the scenic route, utilizing the gravity of different planets to fastidiously modify its trajectory by area and guarantee it arrives at Jupiter with the fitting velocity and route. This extremely complicated, consistently evolving route has been fastidiously deliberate out by Juice’s devoted mission evaluation group during the last 20 years.

Considerably counterintuitively, utilizing the lunar-Earth flyby to gradual Juice down at this level in its journey is definitely extra environment friendly than utilizing the flyby to hurry it up. If we had as an alternative used this flyby to offer Juice a lift in the direction of Mars, we’d have needed to wait a very long time for the following planetary flyby. This primary ‘braking’ manoeuvre is a method of taking a shortcut by the internal Photo voltaic System.

Discover out extra about why Juice’s journey to Jupiter is so lengthy and complicated

How are we making it occur?

Mission operators have already adjusted Juice’s path to make sure that it arrives first on the Moon, then a day later at Earth, at exactly the fitting time, with the fitting velocity, and travelling in the fitting route. They’re assured of success, however it is a dangerous problem that no different area mission has ever confronted earlier than.

As Juice’s Spacecraft Operations Supervisor, Ignacio Tanco places it: “It’s like passing by a really slim hall, very, in a short time: pushing the accelerator to the utmost when the margin along side the street is simply millimetres.”

Juice will come extraordinarily near each the Moon and Earth, that means that real-time pinpoint accuracy is required in all navigation manoeuvres. From 17–22 August, Juice shall be in steady contact with floor stations around the globe. Each second of the way in which, by day and evening, operators will hold a cautious watch on the information coming down from Juice, making any tiny changes wanted to maintain the spacecraft on the fitting course.

Simulation of Juice’s Lunar-Earth Gravity Help

Bonus science!

As if steering Juice round two monumental area obstacles wasn’t sufficient, ESA can even be activating the spacecraft’s ten science devices because it passes by the Moon and Earth.

The lunar-Earth flyby gives a major take a look at atmosphere for instrument groups to gather and analyse knowledge from an precise floor in area for the primary time. For some devices, that is the one alternative to make sure measurements throughout Juice’s complete eight-year journey to Jupiter. It would give scientists and engineers the possibility to calibrate their devices, easy out any remaining points, and who is aware of, they might even make some shocking scientific discoveries.

The lunar-Earth flyby is especially essential for Juice’s Radar for Icy Moon Exploration (RIME) instrument, as RIME knowledge is being disturbed by some digital noise inside the spacecraft.

The flyby of the Moon on 19 August is certainly one of only some probabilities earlier than arrival at Jupiter for the RIME group to examine how this noise is affecting the instrument’s efficiency. Throughout the closest method to the Moon, RIME could have eight minutes to look at alone, with the opposite devices both switched off or set to quiet mode. Primarily based on these observations, the RIME group will work on an algorithm to appropriate the noise downside.

How will you comply with alongside?

A fortunate few could even be capable of see Juice cross overhead, with the spacecraft flying immediately over Southeast Asia and the Pacific Ocean. Highly effective binoculars or a telescope gives you the perfect probability of seeing the spacecraft. Trajectory knowledge might be discovered here.

In the meantime, Juice’s two onboard monitoring cameras shall be snapping pictures all through the lunar-Earth flyby, which we shall be sharing publicly through social media and our Rocket Science blog as quickly as they’re obtained on Earth.

Observe @ESA_Juice and @esaoperations on X for the most recent updates.

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