Model Payload
| NOTE: In March 2011 ESA announced a new way forward for the L-class candidate missions: EJSM-Laplace, IXO and LISA. ESA and the scientific community are now studying options for European-only missions that offer a significant reduction of the cost of these missions while maintaining their core science objectives. In the context of this reformulation exercise EJSM-Laplace has become the JUpiter ICy moons Explorer (JUICE).
For more information about the JUICE mission please follow the link in the left-hand menu. |
To demonstrate that the science objectives of EJSM-Laplace can be achieved, a model payload of 11 instruments has been studied for each of the two spacecraft, the Jupiter Ganymede Orbiter (JGO) and the Jupiter Europa Orbiter (JEO).
The model payload instruments were identified by the Joint ESA-NASA Science Definition Team (JSDT). While notional, the two model payloads are used to bind the engineering aspects of the EJSM-Laplace mission design, spacecraft, and operational scenarios, and to demonstrate achievability of the mission goals. The industrial studies included also optimization of the accommodation for the payloads.
The tables below present the model payloads for JGO and JEO, their primary science contribution and key characteristics. Several model payload instruments on both spacecraft are fundamentally similar but with instrument parameters adjusted according to their primary targets: Ganymede in the case of JGO and Europa for JEO. The other instruments are complementary to best address the exploration of the Jupiter system as a whole. Several options were investigated to see how to most efficiently distribute the instrumentation between the two spacecraft. The instruments were evaluated on the basis of their ability to meet the measurement objectives, perform in the radiation environment, and be designed to meet planetary protection requirements. The flight payload, on both JGO and JEO, will be selected following two coordinated Announcements of Opportunity, one to be released by ESA for JGO and one to be released by NASA for JEO.
The estimated mass of the model payload without radiation shielding is 104 kg for JGO and 106 kg for JEO. These mass estimates account for projected modifications necessary to perform in the radiation environment. Mass for shielding is estimated separately and accounted for at system level.
|
JEO Model Payload | ||
|
Instrument |
Science contribution |
Characteristics |
| Laser Altimeter | Tidal deformation of Ganymede; Quantitative morphology of Ganymede surface features. | Single Beam @ 1064 nm 20 m spot @ 200 km 20 to 90 Hz pulse rate |
| Radio Science Instrument | Interior state of Ganymede, presence of a deep ocean and other gravitational anomalies, Ganymede and Callisto surface properties, atmospheric science at Jupiter, Ganymede and Callisto, Jupiter rings. | 2-way Doppler with Ka-Band transponder, Ultra-stable Oscillator |
| Ice Penetrating Radar | Structure of the Ganymede subsurface & identification of warm ice and/or anomalies within the ice shell and search for ice/ water interface. | Single frequency: 20-50 MHz Dipole antenna: 10 m |
| Visible-InfraRed Hyperspectral Imaging Spectrometer | Composition of non-ice components on Ganymede & Callisto, state & crystal nature of surface ices, on-Jupiter tracking of tropospheric clouds, characterization of minor species, aerosol properties, hot spots and aurorae. | Pushbroom imaging spectrometer with 2 channels with scan system; Spectral range: 400-5200 nm; Spectral resolution: 2.8 nm @ <2.5 μm, 5.0 nm @ >2.5 μm; IFOV: 0.125 – 0.25 mrad; FOV: 3.4° |
| Ultraviolet Imaging Spectrometer | Composition & dynamics of the exospheres of Ganymede & Callisto | EUV and FUV+MUV grating spectrometers, spectral range: 50-320 nm; IFOV: 0.01 mrad; FOV: 2° |
| Narrow Angle Camera | Local-scale geological processes on Ganymede & Callisto; Io torus imaging; Jupiter cloud dynamics & structure. | Colour and multispectral imaging in 12 filters; Spectral range 350-1050 nm; FOV: 0.3 deg IFOV: 0.005 mrad |
| Wide Angle Camera | Global morphology of Ganymede; Global to regional scale morphology of Callisto. | Framing imaging in 12 filters; IFOV: 2 mrad; FOV: 117 deg |
| Magnetometer | Ganymede's intrinsic magnetic field and its interaction with the Jovian field. | Dual tri-axial fluxgate sensors; boom length to meet magnetic cleanliness requirements S/c DC field: <2nT S/c AC field: 0.1 nT rms in the range DC-64Hz. |
| Particle and Plasma Instrument –Ion Neutral Mass Spectrometer | Interaction between Ganymede & Callisto and the space environment to constrain induction responses | Plasma Analyzer Electrons: 1 eV – 20 keV Ions: 1eV – 20 keV Particle Analyzer Electrons: 15 keV -1 MeV; Ions: 3 keV - 5 MeV, ENA: 10 eV – 100 eV INMS Mass range: 1-300 amu M/dM >1000 Sensitivity: 10-14 mbar @ 5s measurement |
| Sub-millimetre Wave Sounder | Dynamics of Jupiter's stratosphere; Vertical profiles of wind speed and temperature. |
2 channels |
| Radio and Plasma Wave Instrument | Ganymede ocean, exosphere and magnetosphere; Callisto induced magnetic field and plasma environment; Jupiter's magnetosphere and satellite interactions | Plasma density(0.001-106 cm-3) and temperature (0.01-20eV); Spacecraft potential (± 50V); Near DC E-Field (up to 3 MHz), E (1kHz-45 MHz) and B (0.1-600 kHz) plasma and radio wave detectors |
|
JEO Model Payload | ||
|
Instrument |
Science contribution |
Characteristics |
| Laser Altimeter | Amplitude and phase of gravitational tides on Europa; Quantitative morphology of Europa surface features. | Single Beam @ 1064 nm 50 m spot @ 100 km 26 Hz pulse rate |
| Radio Science Instrument | Interior state of Io, Europa, Callisto and Ganymede, presence of a deep ocean and other gravity anomalies. Atmospheric science at Jupiter, Europa and Io. Jupiter rings. | 2-way Doppler with Ka-Band transponder, Ultra-stable Oscillator |
| Ice Penetrating Radar | Europa ice/water interface and identification of warm ice and/or water pockets within the ice shell. | Dual frequency: 20-50 MHz Vertical depths: 3 and 30 km Dipole antenna: 3 and 30 m |
| Visible-InfraRed Spectrometer | Composition of non-ice components on Europa, Ganymede & Callisto; State & crystal nature of ices; Io volcano monitoring; Jupiter atmosphere composition | Pushbroom imaging spectrometer with 2 channels with scan system; Spectral range: 400-5200 nm; Spectral resolution: 5 nm @ < 2.6 μm 10 nm @ > 2.6 μm IFOV: 0.25 mrad @ < 2.6 μm IFOV: 0.50 mrad @ > 2.6 μm FOV: 9.2° |
| Ultraviolet Spectrometer | Composition & dynamics of the atmospheres of the Galilean satellites | EUV and FUV+MUV grating spectrometers, spectral range: 70-200 nm; IFOV: 1.0 mrad; FOV: 3.7° |
| Ion and Neutral Mass Spectrometer | Composition of sputtered products from Europa | Reflection time-of-flight mass spectrometer; Mass range: 1-300 Daltons; Mass resolution: >500. |
| Thermal Instrument | Map temperature anomalies and thermal inertia of surface materials on Europa; Jupiter atmosphere composition & dynamics | Pushbroom imaging thermopile line arrays Thermal band: 8-20 μm Thermal band: 20-100 μm 4 narrow filter bands IFOV: 2.5 mrad FOV: 3.0°. |
| Narrow Angle Camera | Local-scale geological processes on Europa, Ganymede & Callisto; Io volcano monitoring; Jupiter cloud dynamics & structure. | Orbital Mode: Panchromatic pushbroom imager Optical Navigation Mode: Panchromatic framing imager Jovian Science Mode: 9 colour framing imager (filter wheel) IFOV: 0.01 mrad FOV: 1.2°. |
| Wide and Medium Angle Camera | Regional-scale Europa morphology & topography from stereo; Global to regional-scale morphology of Io, Ganymede & Callisto; Jupiter atmosphere dynamics. | Wide: 3-colour + panchromatic pushbroom; IFOV: 1 mrad; FOV: 58 deg. Medium: panchromatic pushbroom; IFOV: 0.1 mrad; FOV: 11°. |
| Magnetometer | Ganymede's intrinsic magnetic field and its interaction with the Jovian field. | Dual tri-axial fluxgate sensors; boom length to meet magnetic cleanliness requirements S/c DC field: <2nT S/c AC field: 0.1 nT rms in the range DC-64Hz. |
| Plasma and Particles | Interaction between icy satellites and the space environment to constrain induction responses; Composition and transport in Io's plasma torus | Plasma Analyzer Electrons: 10 eV – 30 keV Ions: 10 eV – 30 keV Particle Analyzer Electrons: 30 keV - 1 MeV Ions: 30 keV - 10s of MeV High-energy Electrons >2, >4, >8 and >16 MeV |