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What Will Huygens probe Land In?


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Huygens probe lands on Titan.
Huygens probe lands on Titan.

Cassini's close flyby to Titan in October has only added to the mystery of what the Huygens probe will find on the moon's surface when it tries to land in January. It could land on a hard surface of rock and ice, or maybe it'll land with a squelch into a slurry of organic materials, or maybe it'll splash down into a hydrocarbon lake. Fortunately, the probe is designed to handle all three landing surfaces, and it should be able to transmit details about Titan as long as it survives.

The prospect of the Huygens probe landing on a hard, soft or liquid surface when it lands on Titan next January still remain following further analysis of data taken during the Cassini mother ship's closest encounter with Saturn's largest Moon during its fly-by on 26th October.

Commenting on the latest data results and implications for the Huygens probe Mark Leese of the Open University, Programme Manager for Science Surface Package [SSP] instruments that will unravel the mysteries of Titan said:

"It's interesting that all of the possible landing scenarios that we envisaged - a hard crunch onto ice, a softer squelch into solid organics or a splash-down on a liquid hydrocarbon lake - still seem to exist on Titan."

Leese added, "A first look at the measurements of Titan's atmosphere during the fly-by suggest that the "Atmosphere Model" we developed and used to design the Huygens probe is valid and all looks good for the probe release on Christmas day and descent to the surface on 14th January 2005."

Further analysis of Titan's upper atmosphere, the thermosphere, has revealed a strange brew as Dr Ingo Mueller-Wodarg of Imperial College London explained," Our instrument, the Ion Neutral mass Spectrometer (INMS), made in-situ measurements of atmospheric gases in Titan's upper atmosphere and found a potent cocktail of nitrogen and methane, stirred up with signatures of Hydrogen and other hydrocarbons. We are now working on a 'Weather Report' for the Huygens landing in January".

Commenting on the surface characteristics of Titan Professor John Zarnecki of the Open University, lead scientist for the Huygens SSP said: "The recent results from the fly-by have started to show us a very diverse and complicated surface. Titan is geologically active but hasn't yet given up all of its secrets. Combining the visible images with Infrared and RADAR data from this and future fly-bys should help to clarify the picture - but the arrival of the Huygens probe in January will perhaps be the key to unlock these mysteries."

Professor Carl Murray, of the Imaging Science System [ISS] team from Queen Mary, University of London also commented on the surface features: "The images of the Huygens' landing site returned by the cameras show a diverse range of features. We see bright and dark areas roughly aligned in an east-west direction. These are similar to wind streaks seen on Mars and may indicate that material on Titan has been deposited by the effects of wind blowing across the landscape. All indications suggest that we are in for a real treat in January when the Huygens probe reaches Titan's surface and returns the first in situ data from this alien world."

UK scientists and technologists are amongst an international team continuing to analyse the latest data received from the NASA/ESA/ASI Cassini Huygens mission after the spacecraft made its close fly-by of Titan last week. The data has provided a wealth of information about Saturn's largest moon, which will not only assist the European Space Agency's Huygens team in advance of the probe landing on Titan in January 2005 but will also increase our understanding of the relationship between Titan and its parent planet Saturn.

Professor Michele Dougherty from Imperial College is lead scientist on the Cassini Magnetometer, which is studying the interaction between the plasma in Saturn's magnetosphere and the atmosphere and ionosphere of Titan. "We have been able to model the Magnetometer data very well from the Titan flyby. There does not seem to be an internal magnetic field at Titan from the observations we obtained during this flyby, but we will have a much better idea about this when we have a further flyby in December which is on a very similar trajectory. All we can say at this point is that if there is a magnetic field generated in the interior of Titan, then it is very small"

Dr Andrew Coates from University College London's Mullard Space Science Laboratory, a Co-Investigator on the Cassini Electron Spectrometer team, said: "We received some remarkable new information about Titan's plasma environment within the context of Saturn's fascinating magnetosphere. Unexpectedly, it looks like we can directly use features of the electron results to understand what Titan's upper atmosphere is made of, supplementing the ion measurements from companion sensors on other instruments. Our electron results contain tell-tale fingerprints of photoelectrons and Auger electrons which we will use for this. Also, the total picture shows how important electrons, raining down on Titan's upper atmosphere, are in helping the feeble sunlight drive the complex Chemistry in Titan's upper atmosphere."

Nick Shave, Space Business Manager at UK IT company LogicaCMG said "The amazing imagery and radar results recently received from Cassini of Titan's surface is providing important early information and creating real excitement in the industrial community. UK industry's critical contributions to Cassini-Huygens via the LogicaCMG Huygens flight software and other systems, such as the parachutes by Martin Baker, will enable even more spectacular science that could help unlock some of the secrets of life on Earth."

UK scientists are playing significant roles in the Cassini Huygens mission with involvement in 6 of the 12 instruments onboard the Cassini orbiter and 2 of the 6 instruments on the Huygens probe. The UK has the lead role in the magnetometer instrument on Cassini (Imperial College) and the Surface Science Package on Huygens (Open University).

UK industry had developed many of the key systems for the Huygens probe, including the flight software (LogicaCMG) and parachutes (Martin Baker). These mission critical systems need to perform reliably in some of the most challenging and remote environments ever attempted by a man made object.




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