Berlin 2014 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 8: Sonne und Heliosphäre (II)
EP 8.9: Vortrag
Freitag, 21. März 2014, 12:45–13:00, DO24 1.103
The Dynamics of Comet ISON C/2012 S1 near Perihelion — •Adalbert Ding1,5, Shadia Rifai Habbal2, Miloslav Druckmüller3, and Peter Aniol4 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany — 2Institute for Astronomy, University of Hawaii, Honolulu, Hawaii, USA — 3Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic — 4ASTELCO, Martinsried, Germany — 5Institut für Technische Physik, Berlin, Germany
Comet ISON C/2012 S1, discovered in 2012, was predicted to have a sun grazing orbit approaching the sun as near as 0.7 solar radii above its surface on Nov 28 2013 at 18:45 UT. Direct white light images of the comet moving through the inner corona were obtained with a wide angle Lyot-type coronograph. The perfect match between the observed inner corona orbit and the trail captured by the LASCO/C2 coronograph was proven using a special correlation procedure. Furthermore emission spectra were obtained during perihelion using a high resolution (λ/Δλ=15000) imaging slit spectrometer operating simultaneously in 2 different bands. An external linear occulter was used to discriminate between the sun’s and the comet’s emission location. The observed line spectra display distinct features of diatomic molecular emission differing from the atomic and molecular absorption structures in the sun’s spectrum. In a preliminary analysis these were assigned to the C2 molecular emission features (Swan bands) and possibly CO+ emission. The molecular emission processes and the dynamic behavior of the comet in a hostile environment will be discussed.