european space · pdf fileradecs 2016, bremen, germany 19 september 2016 european space...

RADECS 2016, Bremen, Germany 19 September 2016

European Space Agency



A Mission to Jupiter – An Introduction to the European Space Agency JUICE Mission.

Ali Zadeh, Renaud Mangeret, Petteri Nieminen, Robert Furnell, Christian poivey, Giovanni Santin, Alessandra Menicucci, Hugh Evans, Torgeir Paulsen, Dave Rodgers, Fabrice Cipriani, Eamonn Daly, Christian Erd, Arno Wielders, Ludovic Duvet, O. Witasse, N. Altobelli + JUICE Study Team



COSMIC VISION

• New challenging ESA

missions will see probes

at Mercury and Jupiter

and its moons, studying

exoplanets and

investigating dark matter

and dark energy.

ESA’s long-term scientific programme is based on a vision. The

‘Cosmic Vision’ looks for answers to mankind's fundamental

questions:

• How did we get from the 'Big Bang' to where we are now?

• Where did life come from?

• Are we alone?



• LISA Pathfinder (2015) testing technologies for gravity

wave detection

• BepiColombo (2017) a satellite duo exploring Mercury

(with JAXA)

• Cheops (2017) studying exoplanets around nearby bright

stars

• Solar Orbiter (2017) studying the Sun from close range

• James Webb Space Telescope (2018) studying the

very distant Universe (with NASA/CSA)

• Euclid (2020) probing ‘dark matter’, ‘dark energy’ and the

expanding Universe

• JUICE (2022) studying the ocean-bearing moons around

Jupiter

• Plato (2024) searching for planets around distant stars

• Athena (2028) space telescope for studying the energetic

Universe

ESA COSMIC VISION MISSIONS



JUICE Mission

• Objective

o JUpiter ICy moons Explorer (JUICE) is the first L-class launch slot in ESA’s Cosmic Vision

Program foreseen in 2022. (L-Class missions constitute ESA’s cornerstone Large-Class missions).

o The objective of the JUICE mission is the investigation of Jupiter and its icy moons, Callisto,

Ganymede and Europa.

o To achieve the scientific goals of the challenging JUICE missions, prior to its selection a

comprehensive set of R&D activities were carried out.

• Mission overview

o Launch in June 2022 with Ariane 5

Interplanetary transfer about 7.5 years ; Multiple fly-bys (Earth, Venus, Mars,

Ganymede)

Scientific measurements around Europa for 35 days

Jupiter high latitudes phase : several Callisto fly-bys during 6 months

Eccentric orbit around Ganymede ; Science performed during 120 days

Circular phase, at 500 km during 160 days before naturally crashing on the moon

• The JUICE mission was awarded to Airbus Defence & Space in 2015.



Jupiter System Archetype for gas giants and potential habitats



JUICE Mission

JUICE CReMA (ESOC), WP-578



Jupiter: Giant magnetosphere



Jupiter: Giant magnetosphere

Callisto

Io Plasma torus

Io flux tube

Europa

Ganymede

Callisto

Moon “footprints”



Severe radiation environment: Jovian Specification Environment Model (JOSE)

ESA UNCLASSIFIED – For Internal Use

Lethal dose from minutes to hours



JUICE electron radiation environment

Earth MEO electron environment

Problem area!

Shielding optimisation



JUICE mission radiation dose

Dominated by trapped electrons

For exposed surfaces, the trapped proton contribution also to be considered

But interplanetary cruise phase should not be forgotten…

Galileo SSI camera was blinded by the solar event of 14.7.2000!

SOHO LASCO “Bastille Day Event”



JUICE Spacecraft

• Main characteristics of the spacecraft

• The JUICE configuration relies on

telecommunication spacecraft structure

heritage with a central cylinder providing

strength and stiffness, and four external

walls supporting the large appendices.



JUICE Spacecraft Configuration

• In particular, the spacecraft configuration features:

Two vaults along the central cylinder gathering most of the

electronic units (platform and instruments)

An optical bench accommodating instruments with stringent

pointing requirements close to the Star Tracker

Optical Heads (STR-OH) to ensure pointing performance

A High Gain Antenna (HGA) to download Gbits/day of science data,

and to ensure TeleMetry (TM)/TeleCommand (TC) links for nominal

operations and safe-mode, and Radio Science

A solar generator with two wings along the Y axis

A bi-propellant main engine aligned with the main thrust axis

A set of bi-propellant thrusters used for attitude control during main

engine boost and a set of bi-propellant thrusters for attitude

control.



JUICE System Constraints

• Main system constraint and drivers

To carry a large set of science payloads with various and sometimes

diverging interface and operation requirements to the Jovian system.

Spacecraft design mainly constrained by the ΔV, as for any

interplanetary mission. Almost 2.4 km/s are performed by the

spacecraft, resulting in about 2.7 tons of propellant

Low solar illumination received at Jupiter, that drives both the size and

the technology of the solar arrays

Thermal control, that shall be designed to cope with a hot environment

at Venus and a cold one at Jupiter

Radiations environment around Jupiter is a major mission

driver, calling for a clear shielding strategy of all equipment

and an in-depth screening of electronic components



JUICE Instruments



Conclusion

• ESA’s Cosmic Vision programme looks for answers to mankind’s

fundamental questions.

• The Cosmic Vision programme consist of a large number of exiting

missions.

• The JUICE mission will explore Jupiter and its icy moons, Callisto,

Ganymede and Europa.

JUICE is a highly interesting and challenging mission- and in

particular the radiation challenges are unique.

A large number of R&D activities were initiated in the early JUICE

selection phases to identify mission feasibility.

The JUICE payload consist of a large number of state-of-the-art

instruments to realise the JUICE scientific goals.

Special attention is given to the JUICE Radiation Harness Assurance

processes to ensure that the payload and platform perform to their

specification in the Jupiter harsh radiation environment.



For more information:

• For more information contact:

• Ali Zadeh: [email protected]

• Renaud Mangeret: [email protected]

• For more information on ESA programmes:

• www.esa.int

• For more information on ESA’s Cosmic Vision programmes:

• sci.esa.int/cosmic-vision/

• For more information on the JUICE mission:

• sci.esa.int/juice/

mailto:[email protected]

mailto:[email protected]

http://sci.esa.int/juice/

european space · pdf fileradecs 2016, bremen, germany 19 september 2016 european space...

Documents