US AND EUROPEAN SCIENTISTS have outlined their joint vision for the Europa Jupiter System Mission…the potential next new mission to the Jupiter system.
With input from scientists around the world, scientists on the joint NASA-European Space Agency (ESA) definition team have agreed that the overarching theme for the Europa Jupiter System Mission will be investigating ‘the emergence of habitable worlds’ around gas giant planets.
The mission would place spacecraft into orbit around two of Jupiter’s moons—a NASA orbiter around Europa called the Jupiter Europa Orbiter, and an ESA orbiter around Ganymede called the Jupiter Ganymede Orbiter.
“The Europa Jupiter System Mission will create a leap in scientific knowledge about the moons of Jupiter and their potential to harbour life,” said Bob Pappalardo, the pre-project scientist for the proposed Jupiter Europa Orbiter, who is based at NASA’s Jet Propulsion Laboratory.
The proposed mission singles out the icy moons Europa and Ganymede as special worlds that can lead to a broader understanding of the Jovian system and of the possibility of life in our Solar System and beyond.
They are natural laboratories for analysing the nature, evolution and potential habitability of icy worlds, because they are believed to present two different kinds of sub-surface oceans.
A tale of two moons
The Jupiter Europa Orbiter would characterise the relatively thin ice shell above Europa’s ocean, the extent of that ocean, the materials composing its internal layers, and the way surface features such as ridges and “freckles” formed.
It will also identify candidate sites for potential future landers.
Instruments that might be on board could include a laser altimeter, an ice-penetrating radar, spectrometers that can obtain data in visible, infrared and ultraviolet radiation, and cameras with narrow- and wide-angle capabilities.
Ganymede is thought to have a thicker ice shell, with its interior ocean sandwiched between ice above and below. ESA’s Jupiter Ganymede Orbiter would investigate this different kind of internal structure.
The Jupiter Ganymede Orbiter would also study the intrinsic magnetic field that makes Ganymede unique among all the solar system’s known moons.
This orbiter’s instruments could include a laser altimeter, spectrometers and cameras, plus instruments to measure magnetic and electric fields, and particles in the space surrounding Ganymede
The two orbiters would also study other large Jovian moons, Io and Callisto, with an eye towards exploring the Jupiter system as an archetype for other gas giant planets.
NASA and ESA officials gave the Europa Jupiter System Mission proposal priority status for continued study in 2009, agreeing that it was the most technically feasible of the outer Solar System flagship missions under consideration.
Over the next few months, NASA officials will be analysing the joint strategy and awaiting the outcome of the next Planetary Science Decadal Survey by the National Research Council of the US National Academies. That survey will serve as a roadmap for new NASA planetary missions for the decade beginning 2013.
Adapted from information issued by NASA. Images courtesy NASA / M. Carroll.
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