4th Philae Science Workshop, Venice 2009 1 4th Philae Science Workshop Venice, 30 March – 1 April...

4th Philae Science Workshop, Venice 2009

1

4th Philae Science Workshop

Venice, 30 March – 1 April

ROMAPROMAP Status Status

I. Apáthy, U. Auster, G. Berghofer, A.P. Remizov

and the ROMAP team


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OutlineOutline

ROMAP Status / Data received in 2008-2009 General status / Checkouts Steins Flyby data

Operation during Cruise SPM checkout Interference tests Asteroid flyby

On Comet Operation Operation during descent Operation during scientific sequences

Question List List of CoI’s


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AFT finger printsAFT finger prints

During AFTs the variable magnetic field characteristics

represent the power consumption of the Lander

The field is generated by a current loop caused by a

electrical contact between Lander and Spacecraft

structure

1nT corresponds approximately to 1mA


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PC8: 2008-07-10


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PC8: ROMAP ROLIS Mini Test 2008-07-10

Nearly undisturbed magnetic field data during the MINI test


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PC9: 2009-02-01


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SPMSPM Checkout Checkout

PC8: 2008-08-01

HV housekeeping channel:

• blue line: Romap has been switched on a second time,

• went successfully after 18min into the surface mode level 0,

• after further 33min into level 1 and

• after further 66min into level 2


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SteinSteins Flybys Flyby

Steins FlyBy results analysis

Magnetic field data are disturbed by both,

magnetic field generated by lander supply current

and by spacecraft interferences.

Main disturbance source is the alternating

heating of the MUPUS pen. Figures show the

disturbance at CA +/-30min and zoomed out for

25sec.


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Fast mode data, offset corrected, +/-30min around CA

Data are disturbed by about 100nT field jumps generated by the supply of the MUPUS pen heating


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Fast mode data, offset corrected, 25sec zoomed out, 10min before CA

MUPUS disturbances can be characterized as two kind of pulses with a repetition rate of about 5sec.


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Spectrogram of the high frequency disturbances. The influence of the reaction wheels is clearly visible.


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Results summary

Magnetic field measurement was disturbed by the MUPUS supply current. This interference occurs unexpected.

In the flyby SCrOP no pulsed heating was mentioned. Consultation for mission planning could be better. For future scientific relevant mission phases, ROMAP request for power profiles of other active instruments.

For the first time both magnetometers (on Lander and Orbiter) worked in parallel at full s/c activity. A true interference test! ROMAP data can be used by the RPC-MAG team for further investigation of potential s/c disturbance sources.

The magnetic field measurement shows that Steins doesn’t interacts significantly (>1nT) with the solar wind. The global magnetization of Steins has to be therefore less than 1mAm²/kg.


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CruiseCruise Operation Operation

RMP_1: Regular Switch-ON of ROMAP (Must) MAG during ExtAFT, SPM during active checkouts

RMP_2: Check SPM high voltage (Desirable)

SPM high voltage level 0-2, level 3-4 optional

RMP_3: Activation of Penning HV (Optional) Risk assessment is necessary before execution.

RMP_4: Common RPC and ROMAP measurements (Desirable)

During asteroids Fly-bys and solar wind passages

RMP_5: Support to Orbiter Interference Tests (Optional) On request of RPC-MAG

RMP_6: New Philae internal interference tests (Must) The Lander shall run on Secondary Battery only


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Descent OperationDescent Operation

Measurement Scenario switching on time: preferred 2-5 hours before release switching off time: tbd. after landing no command, ROMAP in Slow Mode

Expected observations Lander Release Landing gear & Romap boom deployment Cometary Magnetism

Resources Operation time: 6 hours (Mag) Power consumption: 6Wh Data volume: 0.22Mbyte


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Cometary OperationCometary Operation

Measurement Intervals & Resources Operation time: 4 hour intervals - day (Mag+SPM)

8 hour intervals - day and night (Mag +SPM)

Power consumption: 1 Watt continuously Data volume: 60 kbyte/hour Repetition necessary - long term lander

Constrains 4h surface mode noon centered RPC on

Preferred Partners Concert, Civa, Rolis, Sesame, Mupus ?


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List of CoI’sList of CoI’s

H.U. Auster1, I. Apathy2, G. Berghofer3, A. Remizov4,7, R. Roll4, K.H. Fornacon1,

K.H. Glassmeier1, G. Haerendel6, I. Hejja2, E. Kührt9, W. Magnes3,D. Moehlmann9,

U. Motschmann5, I. Richter1, H. Rosenbauer4, C.T. Russell8, J. Rustenbach4,6, K. Sauer4,

K. Schwingenschuh3, I. Szemerey4 and R. Waesch9,

1 Institut für Geophysik und extraterrestrische Physik der TU Braunschweig, Germany

2 KFKI Budapest, AEKI, P.O. Box 49, H-1525 Budapest, Hungary

3 Space Research Institute Graz, Schmiedlstrasse 6, A-8042 Graz, Austria

4 MPS Lindau, P.O. Box 20, D-37189 Katlenburg-Lindau, Germany

5 Institut für TheoretischePhysik der Technischen Universität Braunschweig

6 MPE Garching Giessenbachstrasse, Postfach 1603, D-85740 Garching, Germany

7IKI Moscow, Profsoyuznaja Street 84/32, 117810 Moscow, Russia

8 IGPP at UCLA Los Angeles, California 90095-1567, USA

9 DLR, Institut für Planetenforschung, Rutherfordstrasse 2 , D-12489 Berlin, Germany


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FinitoFinito

Thank you for your attention!Thank you for your attention!


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Question ListQuestion List

(1) Which major open issues need to be performed with your Philae experiment during cruise and when?

(2) Is the instrument fully commissioned and ready for the on-comet science during the 1st 5 days after landing and is it expected to work according to specifications?

(3) If your answer to question (2) is not a clear "yes", please provide explanations on to what is missing, when it should be done and whether full performance is likely to be recovered?

(4) Is the instrument fully commissioned and ready for the on-comet science of the long-term mission and is it expected to work according to specifications?

(5) If your answer to question (4) is not a clear "yes", please provide explanations on to what is missing, when it should be done and whether full performance is likely to be recovered?

(6) What are the science goals for the long-term mission and which specific modes of the experiment are to be used, what are the relevant requirements and constraints?

(7) What are the actual values for the power, energy, data volume and rate as well as any other parameter constraining the instrument modes?

Penning see report

See report

See report

See SSR

Yes (no)

Yes (no)

Penning see report

4th Philae Science Workshop, Venice 2009 1 4th Philae Science Workshop Venice, 30 March – 1 April...

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