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SESAME Status K. Seidensticker 1 , H.-H. Fischer 1 , M. Knapmeyer 2 , K. Thiel 3 ,

SESAME Status K. Seidensticker 1 , H.-H. Fischer 1 , M. Knapmeyer 2 , K. Thiel 3 , I. Apathy 4 , W. Schmidt 5 and the SESAME team 1 DLR (Köln) , 2 DLR (Berlin), 3 University of Köln, 4 KFKI (Budapest), 5 FMI (Helsinki). Outline of Talk. Recent flight operations

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SESAME Status K. Seidensticker 1 , H.-H. Fischer 1 , M. Knapmeyer 2 , K. Thiel 3 ,

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  1. SESAME Status K. Seidensticker1, H.-H. Fischer1, M. Knapmeyer2, K. Thiel3, I. Apathy4, W. Schmidt5 and the SESAME team 1DLR (Köln) , 2DLR (Berlin), 3University of Köln, 4KFKI (Budapest), 5FMI (Helsinki)

  2. Outline of Talk • Recent flight operations • PC8, Steins Flyby and Thermal Characterization 2 • Flight Software FM-3 • CASSE lab experiments • Operation planning until Hibernation • Preview on comet operations • Funding and personnel • Conclusions 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  3. Recent Flight Operations: PC8 Fit of Flywheel vibration spectrum (Speed 10 = 9923 rpm) 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  4. Recent Flight Operations: THC2 +Z Orbiter +Z Lander +X Orbiter +X Lander 192 ° 175 ° Sun illumination during THC2 Sole temperature profiles during third run of procedure LSE_TCHAR obtained with a preliminary calibration derived from Steins Flyby data. The Orbiter slew maneuver to position 192° started at 14:00 SCET. 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  5. Operation Summary • Flywheel Listening • CASSE: Strong vibration (≥ factor 30 above RW background), mainly at fundamental frequency and harmonics; CASSE data used for new calibration of FW rotation rate. • DIM: No interference observed • PP: Broad electrical noise; lines at FW speed and higher frequencies; PP operation is corrupted above 8000 rpm (> speed 00). • Temperature Calibration • Preliminary calibration achieved; data base complete after THC2; final evaluation pending • CDMS and Telemetry • Large improvement compared to PC6 (no data corruption; only one science packet lost during PC8) 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  6. Flight Software FM-3 • Major upgrades implemented / planned for SW FM-3 • CASSE: Fixing of wrong channel assignment (due to FPGA program flaw: missing reset) • CASSE: Automatic adjustment of gain and trigger levels • CASSE: Stacking of sounding measurements for improved S/N ratio • CASSE: Improved synchronization means for Listening of MUPUS-Pen insertion (better time resolution, evaluation of MUPUS-PEN depth information) • DIM: Autonomous measuring depending on dust flux and sensor status • General: Temperature measurements with extended range (<= -105 °C) • FM-3 shall be uploaded during PC #10 (September 2009) 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  7. CASSE Lab Experiments: August 2008 MUPUS-Pen Simulator Source General Setup CASSE Piezo Source & Receiver 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  8. CASSE Lab Experiments: Analysis Spectrograms Seismic Section Visualization Bootstrap Error Estimators Poisson Numberfrom Wadati Diagrams Trace Synchronization (synthetic example) Trace Stacking Particle Motion Visualization • New software tools developed for evaluation 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  9. CASSE Lab Experiments: Results Air Wave Velocities T [K] v [ms-1] 253 319 263 325.3 273 330.9 Shielding the air wave from the MUPUS-Pen simulator was not possible. We could demonstrate that the main recorded signal traveled at air sound velocity. • Future Experiments will need: • Improved mounting of MUPUS Simulator • Air wave shielding • Infinite medium (no box walls!) • Testing the influence of ground contact variation • Improved software, e.g. for synchronization Distance from source vs. sound arrival times 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  10. SESAME Cruise Phase Operations PC6: FM-2 upload PC8: 1. Flywheel test, thermal calibration 1 Steins flyby: Thermal calibration THC2: Thermal calibration 2 PC10: FM-3 upload, tests, CASSE calibration PC12: Flywheel test, interference tests Lutetia flyby: Search for IDPs 2014: Checkout, FM-4 upload? 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  11. Operation Planning until Hibernation I • PC10 Operations • Upload flight software FM-3 (SCrOP requirement SES_4) • CFT-4 (also test of FM-3) (SES_16) • CASSE Calibration 2 (also test of FM-3) (SES_14) • WOL Measurement 3 (also test of FM-3) (SES_9) • ESB3 Operations replaced by Thermal Characterization 2 (SES_10) 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  12. Operation Planning until Hibernation II • PC12 Operations • Repeat of Flywheel Test with automatic gain setting. Flywheel in descent mode? (SES_7) Touchdown detection possible? • Interference Tests (SES_5) • CASSE Calibration 3 (SES_14) • WOL Measurement 3 (SES_9) • Lutetia Operations • Search for IDPs (SES_11) (Flight through Hill sphere) • Thermal Calibration 3 (SES_10) 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  13. Preview on Comet Operations: In Orbit • CASSE: Detect cometary ice-dust particles • DIM: Determine particle flow rate and direction • DIM: Determine particle properties (velocity, radius, elastic parameters etc.) • PP: Monitor outgassing activity 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  14. Preview on Comet Operations: SDL • CASSE: Register landing impact => elastic / inelastic parameters • CASSE: Calibrate sound transfer via unfolded landing gear • DIM: Determine particle flow rate and direction vs. height • DIM: Determine particle properties vs. height • PP: Monitor outgassing activity • PP: Calibrate sensor properties with unfolded landing gear 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  15. PP Calibration during Descent Measurements of stray capacitances between cables / sensors and structure in vacuum and with the unfolded landing gear PC8 current measurements Parameters to be characterized during descent while still under near vaccuum conditions Induced potential variations 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  16. Preview on Comet Operations: FSS (+ LTS) • CASSE: Determine elastic properties of landing site • CASSE: Determine sub-surface structure with MUPUS-Pen • CASSE: Detect and locate micro-seismic events • DIM: Study the near-surface cometary particle flow • DIM: Determine particle properties • PP: Determine electrical properties of the surface material • PP: Monitor outgassing activity 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  17. Funding and Personnel • CASSE / SESAME • Organizational changes at DLR; thermal-vacuum chambers now at DLR, Bremen • Personnel: • DLR, PF: K. Seidensticker (PI), M. Knapmeyer (Co-I, part-time, lab and analysis),DLR, RB-MUSC: H.-H. Fischer (Co-I, part-time, flight S/W, operation) • Univ. Köln: K. Thiel (Co-I, retired) • DIM • Funding by the Hungarian Space Office through ESA/PECS guaranteed until mid 2013 on a yearly 9-13 k€ level; additional money requested by MPS (Lindau) from the DLR (Bonn) • Personnel: • KFKI, AEKI: I. Apáthy (PI), A. Péter (Co-I, engineering) (both retired);A. Péter will be followed by Attila Hirn soon. • MPS: H. Krüger (Co-I, managing scientist); will follow I. Apathy as DIM-PI • Supporting scientists: A. Juhász (Co-I, KFKI, RMKI), M. Podolak (Co-I, TAU) • PP • In-house funding for Rosetta support, external funding for special activities on application. • Personnel (no changes): • FMI: W. Schmidt (PI)Co-Is: ESTEC: H. Laakso, R. Trautner; CETP: M. Hamelin 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

  18. On the way to 67P/C-G: Conclusions • Upgrades of flight and ground software needed for more efficient use of hardware and telemetry • Improving analysis methods, e.g.: • CASSE: Further Lab experiments planned; analysis of seismograms • DIM: More precise impact model; calibrations • PP: More calibration work • Low resources and personnel changes lengthen most activities • Delivery of drafts of the SESAME Flight Operation Plan (FOP) and EAICD planned for the first half of 2009 4th Philae Science WorkshopVenice, 30 March - 1 April 2009

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