Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Towards a Viable Europa Penetrator A. Smith, R. Gowen, A. Coates, etc – MSSL/UCL.

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Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Towards a Viable Europa Penetrator A. Smith, R. Gowen, A. Coates, etc – MSSL/UCL I. Crawford – Birkbeck College London P. Church, R. Scott – Qinetiq Y. Gao, M.Sweeting – Surrey Space Centre/SSTL T. Pike – Imperial College A. Ball – Open University J. Flanagan – Southampton University

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Contents  Introduction  Background  A New Start…  Science  Feasibility  Cost  Technology developments  Summary

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Introduction  Problem: How to work towards a surface element proposal that has both scientific and technical viability.  Offer potential for unique science and ground truth to complement a Europa orbiter.  Here we consider Penetrator (vs passive impactor, soft lander, etc).  We present some thoughts on technology, payload and cost issues that could be input to an assessment study.

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK What Characterizes micro-penetrators ?  Very low mass projectiles ~2-5Kg (c.f. Lunar A 13.5Kg; DS-2 3.6Kg)  High impact speed ~ m/s  Very tough ~10,000gee  Penetrate surface ~ few metres  Perform initial important science on planetary surface

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Mullard Space Science Laboratory  Part of University College London  140 Staff  In-house mechanical and electrical engineering design, manufacture and test  Provided hardware or calibration facilities for 17 instruments on 12 spacecraft currently operating  Provided stereo cameras for Beagle-2  Leading PanCam development for EXOMARS Hinode Launch

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Penetrator Consortium  MSSL –Consortium lead, payload technologies, payload system design  Birkbeck College London –Science  Imperial College London –Seismometers  Open University –Science and instrumentation  QinetiQ –Impact technologies, delivery systems technologies  Southampton University –Optical Fibres  Surrey Space Science Centre and SSTL –Platform technologies, delivery system technologies

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK A New Start  An initial ESA technical study for a first Europa probe led to conclusion that there would be insufficient mass (~1Kg) to support a survivable probe, to perform significant science, and that any development costs would be excessive.  A following ESA TRP Empie study, aimed at a second Europa mission, removed the mass limit resulting in a feasible (at a pre- Phase A level), 4 probe (1.7Kg each) system which are axially oriented and decelerated with modest mass (20Kg).  It is not clear that 20Kg is required for a first mission. For example a 2 probe system around 15 Kg might be feasible if such mass were available.  There is a considerable body of evidence that real probes (well beyond pre-phase A level) impacting around 300 m/s with gee forces well in excess of 10kgee are survivable.  A pre-cursor Lunar mission (~2010) (which could perform excellent science) would provide timely and cost effective technical developments, thereby reducing necessary Europa developments to a delta level.

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Europa Penetrator ‘Payload’ Science  Beeping Transmitter - For Earth based VLBI determination of surface ice movement - For Earth based VLBI determination of surface ice movement (deformation, seismic vibration) (deformation, seismic vibration)  Micro-Seismometers/tilt-meter - Detection of natural (or impact) seismic activity. - Presence and size of an under ice ocean. - ‘cryo-tectonic’ activity  Accelerometer - Determination of ice characteristics and penetration depth.  Chemical Sensors - Presence, extent, concentration of organics (possible life indicators). - Presence, extent and concentration of other chemical species - Presence, extent and concentration of other chemical species (minerals, chirality, isotopic abundances ?) (minerals, chirality, isotopic abundances ?)  Other sensors: Heat flow (melting depth, internal structure), micro- camera (descent, surface), magnetometer, radiation monitor, etc. => Assess science value, sensitivity, resource requirements, likelihood of success c.f. other surface/orbit alternatives

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Mars96 (Russia) failed to leave Earth orbit DS2 (Mars) NASA 1999 ? Planetary Penetrators - Planetary Penetrators - History Japanese Lunar-A much delayed Many paper studies and ground trials    No survivable high velocity impacting probe has been successfully landed on any extraterrestrial body TRL 6

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Feasibility  There is no ‘history’ of failures of high speed (~300m/s) planetary probes. Has only ever been one planetary deployment - Mars Polar Orbiter DS2 which failed alongside the soft lander.  Military have been successfully firing instrumented projectiles for many years to at least comparable levels of gee forces expected for Europa. Target materials mostly concrete and steel.  NASA and Japan have both developed penetrators and scientific instruments to withstand such high gee forces to TRL 8. Lunar-A passed its final all-up impact test this summer and is now simply awaiting a launch.  Lunar-A or another Lunar technical demonstrator mission could provide first space demonstration in timescale useful to Europa mission.  UK Penetrator consortium has plans to provide ground impact demonstration tests in next 2 years.

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Examples of electronic systems  Have designed and tested electronics for high-G applications: –Communication systems  36 GHz antenna, receiver and electronic fuze tested to 45 kgee –Dataloggers  8 channel, 1 MHz sampling rate tested to 60 kgee –MEMS devices (accelerometers, gyros)  Tested to 50 kgee –MMIC devices  Tested to 20 kgee –TRL 6 MMIC chip tested to 20 kgee Communication system and electronic fuze tested to 45 kgee

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Targetting and Impact Site Issues  Ability to impact at site of optimum scientific interest ? –To land anywhere will give a high degree of scientific return – surface composition and structural strength (also useful to follow on mission), seismometer determination of ice depth and event rates. Detection of organic chemicals will still be performed but not optimum. –Could optimise impact ellipse zone using existing imagery, or during Europa approach and early orbit camera imagery with autonomous analysis to provide landing coordinates within descent system capabilities.  Ability to successfully penetrate rough surface ? –Glancing impact angle could prevent penetration. Study and tests required for expected ice. –Could optimise impact ellipse as above, but with criteria for surface flatness/smoothness. –Implement small pre-impact explosive to pre-smooth local entry surface. Defense sector has experience of this technology which is reported to be reliable. Disadvantage is possibility of chemical contamination of upper impact site which would complicate chemical sensing analysis.  Ability to survive non-perpendicular surface impact ? –Lunar penetrator mission limits entry to within around 8  of vertical, to limit possibility of probe failure through excess probe sideways stresses. –Study required to determine if similar effects likely to exist for Europan ice, and to what degree.

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Cost  NASA DS2 developments were characterised by ambitious challenges and extensive iterations. Japanese developments were characterised by a lack of pre-existing military support base necessitating a great deal of impact survival development and testing.  UK defence sector exists with considerable experience including both test facilities and highly predictive (hydrocode) modelling capability which greatly reduces the need for extensive trials.  Proposed UK Lunar penetrator development (which will address excellent science) will provide a significant reduction in cost for Europa.  Possibilities for further cost saving by collaboration and purchase of existing technology.

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Technical Developments Required Stepwise developments: Terrestrial  Lunar  Europa (very cold, high radiation, ice material) high radiation, ice material) Penetrator Platform :- (a) To Moon –Define payload environment –Micro attitude control(orient to survive impact and ensure penetration) –Micro de-orbiting(reduce speed to survivable level) –Spacecraft ejection mechanism –Batteries (for long lifetime on surface) –Penetrator Impact survival(design, modelling, test, including electronics) (b) Delta Developments for Europa –Revise payload environment –Penetration survival (Already survive penetration into concrete and steel !) (See earlier slides regarding surface conditions) –RHU(prevent batteries becoming too cold) –Communications (penetrator spacecraft through Europan ice?) –Radiation hard(much higher radiation level the Moon)

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Technical Developments Required. Penetrator Payload :- (a) To Moon –Seismometer(options, impact survival, sensitivity, operation) –Chemical sensing (organic/astrobiology) (or access to existing technology). (various options - impact survival, operation sensitivity) sensitivity) –Autonomy/data handling(affected by operations, comms) –Heat flow(may also be useful on Europa) –Descent Camera (b) Delta developments for Europa –VLBI Beacons(new to Europa) –Radiation hard(much more radiation than Moon) –Further options/developments…

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK Summary We have proposed a new start to include penetrators as a useful Europa surface element in an assessment study for the ESA Cosmic Visions Jupiter-Europa Mission. We have demonstrated the feasibility for many of the key elements, and identified technical developments that could be necessary to achieve others which either may not be accessible or yet sufficiently mature. The UK penetrator consortium and PPARC proposed Lunar penetrator mission could provide a useful and timely path to assist in the assessment process, and help reduce costs significantly. Naturally we would welcome international participation…

Jupiter-Europa Cosmic Vision Meeting, London, Nov 23-24, 2006 MSSL/UCL UK - End -