Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p11a0346s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P11A-0346
Physics
6020 Ice, 6045 Physics And Chemistry Of Materials, 6055 Surfaces And Interiors, 6094 Instruments And Techniques
Scientific paper
In only a few weeks form now the Rosetta Spacecraft will begin its long voyage towards comet p/Wirtanen. One of the instruments (MUPUS) on the Rosetta Lander will measure the temperature profile and the thermal diffusivity of the uppermost 32 cm as a function of time. At the same time while we were designing and building our instrument, major progress was achieved in the field of thermophysical comet modelling: hosted by ISSI (Bern, Switzerland), a group of experienced modellers worked out a set of comet reference models (computer code and a set of physical input parameters). We employ results from one of the ISSI comet models (Benkhoff's model No. 4B) to assess the performance of our instrument, as it would see the ISSI comet. Based on test results and the calibration of the Flight Model, we process the data delivered by the model code, as if it would have been measured with the actual instrument (reduction of spacial and temporal resulution to a few cm and 5 minutes, reduction of rel. accuracy to 0.05 K, noise added). Simulated temperature, thermal diffusivity, heat flow and energy balance results will be presented. We conclude that the design requirements that have been set up well before the ISSI group started their work still hold, and the achieved performance of the instrument is well suited to meet the science goals on an ISSI-type target comet.
Benkhoff Johann
Seiferlin Karsten
Spohn Tilman
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