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<MUPUS> Status Venice, 30-Mar-1-Apr 2009
Philae STW 2009
2 LOWG#12, DLR Cologne 18-20th of November 2008
Main Events with MUPUS participation (since last Philae STW)
PC#8 PC#9 Steins fly-by Thermal Characterization 2
3 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
PC8 THC Mode
PEN12 heated with 150 mW for 20 minutes
5 LOWG#12, DLR Cologne 18-20th of November 2008
MUPUS PEN calibration 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
PEN1
PEN16
TCU-MUPUS-DD
Pt-100
PENEL, T=-50°C
6 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
THC2 Results 1, PEN temperatures
Using only inflight calibration points (linear extrapolation) !
8 LOWG#12, DLR Cologne 18-20th of November 2008
THC2 Results 2 (Calibration comparison)
- Most PEN sensors stable since ground calibration in 2001- 5 PEN sensors have changed R(T) characteristics
9 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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 LOWG#12, DLR Cologne 18-20th of November 2008
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)