Billion euro ESA mission to explore icy worlds of Jupiter

Posted by pt91 at May 02, 2012 04:45 PM |
University of Leicester involved in successful bid
Billion euro ESA mission to explore icy worlds of Jupiter

The illustration shows Jupiter and its large moons: Ganymede, Europa, Io and Callisto. Copyright: ESA; Artist: M. Carroll

Issued by University of Leicester Press Office on 2 May 2012

Image of University of Leicester scientist Dr Emma Bunce available via

Other image info at end of release

The European Space Agency (ESA) has approved a new mission to explore Jupiter and its icy moons to reveal fresh insights into the habitability of the ‘waterworlds’ orbiting the giant planets in our solar system and beyond.

On 2 May 2012, at a meeting in Paris, ESA’s Science Programme Committee voted to go ahead with the project, the Jupiter Icy Moons Explorer (JUICE), the first European-led mission to the outer solar system, and the first spacecraft destined to orbit an icy moon. The JUICE spacecraft is scheduled to launch in 2022, arriving in the Jupiter system in 2030.

Approval for the estimated one billion euro contract for the mission came with UK researchers deeply involved in the leadership and planning for JUICE and playing a vital role in gaining approval for the mission ahead of rival bids. The proposal was led by a UK scientist and UK scientists make up four of the 15 members of the ESA Science Study Team for JUICE with the team including researchers from Imperial College London, Oxford University, University of Leicester, and UCL (University College London). 

The primary target of the mission is the solar system’s largest moon, Ganymede, an icy world 8% larger than the planet Mercury. Ganymede is unique within the solar system – it is thought to harbour a deep ocean under the icy crust, it has its own internally generated magnetic field, and it has an ancient surface littered with more individual types of crater than anywhere else in the solar system. 

If moons are common features of giant planets around other stars, then Ganymede may represent a whole class of potentially habitable environments in our galaxy. JUICE will carry experiments designed to study the sub-surface ocean, the geology and composition of the surface, and its interaction with its plasma environment, to assess its potential as a habitable environment in our solar system. The spacecraft will also investigate Jupiter’s other icy worlds, Callisto and Europa, as well as the giant planet’s complex atmosphere and extended magnetosphere.

Imperial, Oxford, Leicester and UCL will be among the UK institutions working to propose experiments to be carried as part of the spacecraft payload. These instruments will be specifically designed to study the gas giant, its icy moons and charged particle environment to an unprecedented level of detail, giving our most detailed characterisation of the Jovian system ever obtained.

Professor Michele Dougherty of Imperial College London, lead scientist for the JUICE proposal, said: ‘Ever since Galileo’s discovery of the four largest moons of Jupiter, we’ve wondered what it must be like on their icy surfaces, looking into a night sky dominated by the gas giant Jupiter. From the volcanic moon Io, to the potential sub-surface oceans of Europa and Ganymede and the ancient cratered terrain of Callisto, these four moons are fascinating worlds in their own right.’

As well as making close measurements of the surface, sub-surface, magnetic and plasma environment of Ganymede the mission will also focus on the other icy moons; performing multiple flybys of Callisto and two flybys of Europa. By studying all three of these icy environments the mission’s studies of Ganymede will take on a broader significance. 

Dr Leigh Fletcher of Oxford University, a member of the ESA Science Study Team for JUICE, said: ‘Scientists have had a lot of success detecting the giant planets orbiting distant stars, but the really exciting prospect may be the existence of potentially habitable ‘waterworlds’ that could be a lot like Ganymede or Europa. One of the main aims of the mission is to try to understand whether a ‘waterworld’ such as Ganymede might be the sort of environment that could harbour life.’ 

In order to assess whether Jupiter and its moons could provide habitable environments, and provide a model for gas giant systems orbiting other stars, the spacecraft will make an extensive study of the planet’s dynamic, evolving atmosphere, with its belts, zones and gigantic swirling storms, over the 3-year duration of the mission. JUICE will also study the magnetic and charged particle environment of Jupiter, which has the largest magnetosphere in the solar system, and its coupling to the moons (particularly Ganymede).

Dr Emma Bunce
Dr Emma Bunce.

Dr Emma Bunce of the University of Leicester, deputy lead scientist for the JUICE proposal, said: ‘We need to place the possible habitability of these “waterworlds” into some broader context, and JUICE will do that by also studying the surrounding environment. Ganymede is strongly coupled to its parent Jupiter - through gravitational and electromagnetic forces – studying this interaction gives us further insight into its unique place in the solar system.’

Vice-Chancellor of the University of Leicester Professor Sir Robert Burgess said: “It is a tremendous achievement that Leicester has played a key role in the bid for the first European-led mission to the outer solar system. We are proud of Dr Emma Bunce and her team in our renowned Department of Physics and Astronomy for spearheading the bid to explore Jupiter and its icy moons.  Research is all about discovery and moving the frontiers of knowledge.  This is at the very core of what we do.  This research will extend over 50 years of space research at Leicester well into the future and presents new opportunities for the region and beyond  to benefit from the innovations that arise from space science.”

Professor Andrew Coates of UCL, a member of the ESA Science Study Team, said: ‘Studying these watery worlds is the next vital step beyond Mars in the search for the conditions for life in our solar system. Ganymede’s unique magnetic shield helps protect it somewhat from Jupiter’s harsh radiation belts and rapidly rotating magnetosphere, and we want to understand its effectiveness. Europa and Callisto provide key comparisons as we search for the solar system’s ‘sweet spots’ for habitability.’

The data JUICE will send back about the varied environments of Jupiter and its icy moons will benefit many areas of science with geologists, astrobiologists, space and atmospheric physicists all queuing up to see how the mission’s findings will affect their disciplines.

The announcement will lead to further opportunities for British companies as they look to bid for contracts to build elements of the JUICE spacecraft and its instruments. The UK Space Agency estimates that the space industry's overall contribution to UK GDP is £7.9 billion and that it employs nearly 27,000 people, with around 60,000 more jobs enabled by the space sector.

University of Leicester and Jupiter Mission

The University of Leicester has a strong track record of space research and as such has had significant involvement in the L Class mission competition.  Following the selection of the JUICE mission it is expected that there will be an “Announcement of Opportunity” issued by the European Space Agency calling for groups of scientists to propose the science instruments to be carried on board the spacecraft.  Here at the University of Leicester (jointly with our Belgian colleagues in Liège) we will make a proposal to send a special camera operating at ultraviolet wavelengths (slightly shorter wavelengths than visible light) which is suitable for observing the aurora (or northern lights) in Ganymede’s and Jupiter’s atmospheres.  

In addition given the strong background of the University’s Department of Physics and Astronomy in planetary research, and involvement in large missions such as the current NASA Cassini mission at Saturn and the future ESA BepiColombo mission to Mercury, we would expect that scientists (and future scientists) here will be fully engaged with the mission and with the analysis of data in the future. Locally the community will continue to benefit from the University of Leicester’s involvement in space missions through public outreach activities through the National Space Centre, for example, and through engagement with local schools. 

For further information contact:

Professor Michele Dougherty of Imperial College London on mobile; email OR Simon Levey on +44 (0)207 5946702 or email

Dr Leigh Fletcher of Oxford University on +44 (0)1865 272089 or email

Dr Emma Bunce of the University of Leicester on +44 (0)116 2523541 or email

Professor Andrew Coates of University College London on mobile; email

Alternatively contact the University of Oxford Press Office on +44 (0)1865 283877 or email

Notes to editors

*Suggested images: a portrait of Ganymede [credit: NASA] is available here:

A composite image showing [L-R] the icy moons Europa, Ganymede, & Callisto [credit: NASA] is available here:

Original image details:

More JUICE images are available here:,19,22&farchive_objectid=30912&fareaid_2=129

*The selection of the Jupiter mission is the culmination of five years of hard work by the ESA team of scientists and engineers. ESA’s Cosmic Vision L-class competition started in March 2007 with a call to the scientific community to propose new ideas for future exploration.  A previous incarnation of JUICE was selected as one of three finalists (JUICE, Athena, and NGO), which have been going head-to-head in the ESA studies since 2010. At that time, all three proposals had significant US involvement, and the Jupiter mission was known as the Europa Jupiter System Mission (EJSM/Laplace). However, in March 2011, NASA withdrew from the L Class missions in general, and the reformulation phase began to rework the three proposals into European-led missions, leading to the evolution of the JUICE spacecraft.

*The JUICE mission relies on a strong heritage of outer solar system exploration by UK scientists, such as those involved in the Cassini-Huygens mission to Saturn and Titan.

*For more on how the space industry benefits the UK see: ‘The Size and Health of the UK Space Industry’, November 2012:

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