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< MUPUS> Status

Philae STW 2009. < MUPUS> Status. Venice, 30-Mar-1-Apr 2009. Main Events with MUPUS participation (since last Philae STW). PC#8 PC#9 Steins fly-by Thermal Characterization 2. PC8 Summary. Software Patch V7.2 successfully uploaded Burned to EEPROM x0000 after verification during PC8

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< MUPUS> Status

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  1. Philae STW 2009 <MUPUS> Status Venice, 30-Mar-1-Apr 2009

  2. Main Events with MUPUS participation (since last Philae STW) • PC#8 • PC#9 • Steins fly-by • Thermal Characterization 2

  3. PC8 Summary • Software Patch V7.2 successfully uploaded • Burned to EEPROM x0000 after verification during PC8 • MUPUS worked flawlessly during PC8 • 3 procedures executed • Active Checkout 1 (basic tests, repetition of PC4) • Active Checkout 2 (performance , revised version of PC4 test) • Inflight calibration (standard checkout procedure) • 164 TC‘s send and executed without error • Detailed testing of nearly all MUPUS modes in different configurations • 5610 science data packets produced without problems • Active thermal conductivity measurement mode tested first time in flight • Performance improved • ANC-M sampling frequency 47.8 kHz (from 33 kHz) • ANC-T measurements added to ANC mode • PEN and TM calibration (sensitivity loss confirmed) improved

  4. PC8 THC Mode PEN12 heated with 150 mW for 20 minutes

  5. MUPUS PEN calibration PENEL, T=-50°C • PEN sensors calibrated on ground between -40°C and +50°C • Data of limited quality • Inflight calibration needed to cover low T expected for the comet • Method: • Use Pt-100 in the holder as reference • Assume that PEN tube and holder at the same temperature in equilibrium (before PENEL switched on, justified by TV test with PEN FS) • Interpolate resistance backward in time to start of PENEL preheating (equilibrium) • => Ri=Ri(Tref), i=1,2,…,16 • 5 inflight calibration points between -107°C and -96°C points acquired since PC#6 Pt-100 PEN1 PEN16 TCU-MUPUS-DD

  6. Steins Flyby Results • MUPUS worked flawlessly during Steins flyby • 4607 science data packets produced during continous MUPUS TEM mode operations for 17 h around CA • No communication problems • Magnetometer measurements disturbed • Temperature rise of PHILAE balcony detected with all MUPUS sensors • Strong gradient after spacecraft flip (especially for ANC-T) • MUPUS inflight calibration data gives consistent PEN temperature readings

  7. THC2 Results 1, PEN temperatures Using only inflight calibration points (linear extrapolation) !

  8. THC2 Results 2 (Calibration comparison) • Most PEN sensors stable since ground calibration in 2001 • 5 PEN sensors have changed R(T) characteristics

  9. THC2 Results 5 (ANC-T temperatures) • ANC-T temperatures not strongly dependent on E-Box temperature • Differences between ANC-T and TCU-Anchor sensors probably real

  10. THC2 Summary • MUPUS worked flawlessly during THC2 • 7907 science data packets produced during continous MUPUS TEM mode operations for 75 hours • Strong temperature rise of PHILAE balcony detected with all MUPUS sensors • Highest balcony temperature recorded in flight • MUPUS inflight calibration gives consistent PEN temperature readings • 5 PEN sensors changed R(T) characteristics since ground calibration • ANC-T temperatures consistent with TCU anchor sensors • Very useful for improvement of MUPUS calibration ! Thanks to LCC, SONC, and ESA !

  11. Experiment Status for Cruise • ScROP Requests closed • R_LZ021: MUP_8 Repetition of MUPUS PC4 Tests with revised MUPUS SW • R_ LZ023: MUP_13 MUPUS Software patch V7.2 • R_LZ095: MUP_12 MUPUS Participation in PHILAE Thermal Characterization tests • Open ScROP Requests • R_LZ022: MUP_10 EEPROM refresh procedure • R_LZ070: MUP_11 MUPUS Participation in PHILAE interference tests • R_LZ071: MUP_15 Test of the MUPUS on-comet first science sequence procedure • R_LZ107: MUP_16 Test of the MUPUS on-comet monitoring procedure • NCR Status • All MUPUS NCR’s closed

  12. Remaining Cruise Activities • PC10 Operations • R_LZ017:MUP_4 MUPUS In-Flight Calibration • R_LZ070: MUP_11 MUPUS Participation in PHILAE interference tests • PC12 Operations • R_LZ017:MUP_4 MUPUS In-Flight Calibration • R_LZ022: MUP_10 EEPROM refresh procedure • R_LZ071: MUP_15 Test of the MUPUS on-comet first science sequence procedure (joint PHILAE test) • R_LZ107: MUP_16 Test of the MUPUS on-comet monitoring procedure (joint PHILAE test) • Lutetia Operations • Preferably as during Steins/THC2 (tbc, ROMAP ?) • PC13 Operations • R_LZ017:MUP_4 MUPUS In-Flight Calibration

  13. MUPUS during SDL • TM calibration during descent (R-SDL-1, MUPUS FOP) • TM has lost sensitivity • Unique opportunity for inflight calibration with undisturbed known background • ANC-M acceleration measurements at touchdown (R-SDL-4) • Starts with pre-trigger (ringbuffer) mode (Interrupts enabled, SST evaluated) • Information from CDMS by SST about selected anchor for firing required at least 100 ms before firing (R-SDL-5) • ECR By MUPUS on CDMS raised 2006, CDMS fulfilled (A. Balasz) • INT4 (hardware) trigger starts sampling with 48 kHz for about 650 ms (1 RAM page, 64 kByte !), Interrupts disabled ! • Pre-trigger mode, software checks SST again for either: • safe anchoring => finish ANC mode, start data transmission to CDMS • firing of next anchor, then data transmission to CDMS Read the FOP ! Minimum time (> 0.65 s) needed between two anchor shots to be analyzed !

  14. SDL cont., ANC-T Thermal diffusivity • Extension of MUPUS operation during SDL until at least 1 h after touchdown for ANC-T thermal diffusivity measurement (R-SDL-6) • Deepest thermal properties measurement of a comet ! • Combine with Thermal Inertia measurements (one full rotation ~ 12-13 h) during FSS (keep MUPUS ON for a full rotation of the comet) to save ressources. Read the FOP !

  15. MUPUS during LTS • MUPUS is a longterm experiment aimed at detecting changes in subsurface structure caused by increasing activity • => Landing in an „active region“ (R-LT-2) • Activity is the KEY PROPERTY of a COMET ! • MUPUS should be operated whenever feasible during LTS (R-LT-1) • Operation at least once a week for a full rotation (R-LT-3/4)

  16. Scientific activities • MUPUS Team Meeting in May 2009 (Graz) • MUPUS Flight operations (update of FOP) • Thermal properties measurement method • Assessment of reference methods and materials • Definition/Characterization of MUPUS internal standards • Lab experiments + thermal modelling • Improvement of temperature calibration • Thermal modelling + Lab Experiments • Science Themes Inputs • Delivered to Lead Scientists in August 2008 • (Minor) update Feb. 2009 • New approach for thermal modelling of active regions • Moving boundaries, Stefan problem (E. Kührt, N. Gortzas)

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