Bonn 2010 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 3: Poster
EP 3.10: Poster
Montag, 15. März 2010, 17:45–19:00, AKM Foyer
The APXS (Alpha Particle X-Ray Spectrometer) within the Rosetta mission: Preliminary tests and preparations for landing on a comet — •Dirk Schmanke1, Jordi Girones Lopez1, Göstar Klingelhöfer1, Jasmin Maul1, Johannes Brückner2, Ralf Gellert3, and Claude d'Uston4 — 1Inst. für anorg. u. analyt. Chemie, JoGu-Universität, Staudinger Weg 9, Mainz — 2Max-Planck-Institut für Chemie, Mainz — 3Department of Physics, University of Guelph, Canada — 4CESR, Toulouse, France
The Rosetta Mission was launched in 2004 with the main objectives to gain a better understanding of the origin and formation of comets. After 10 years the comet 67P/Churyumov-Gerasimenko will be reached and the probe will split into an orbiter and a lander. As a part of the lander payload APXS will measure in situ the chemical composition of the comet's surface and it's alteration during the trajectory of the comet around the sun. APXS combines an alpha mode for alpha spectroscopy and a x-ray mode for alpha particle/x-ray induced x-ray spectroscopy in one single instrument, being low in mass and power consumption. The cometary surface will be irradiated by a Curium 244 source, which will excite characteristic x-rays of the present elements. The alpha detectors will allow detection of elements like C and O and groups of elements with a higher Z. The x-ray-SD-detector will allow to detect most of the elements from Na to Ni. During the journey to the comet preliminary tests of the Rosetta probe and its payload at regular intervals are performed. They are used to optimize and improve the quality of the x-ray spectra of the APXS.