Berlin 2014 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 5: Postersitzung
EP 5.20: Poster
Tuesday, March 18, 2014, 16:30–18:30, DO24 Foyer
Comet ISON - from cradle to grave: The approach phase — •Jessica Agarwal1, Hermann Boehnhardt1, Dietmar Germerott1, Ulrich Hopp2, Bernd Inhester1, Luisa Lara3, Nilda Oklay1, Borut Podlipnik1, Christoph Ries2, Michael Schmidt2, Udo Schühle1, Colin Snodgrass1, Sami Solanki1, Bringfried Stecklum4, Luca Teriaca1, Cecilia Tubiana1, and Jean-Baptiste Vincent1 — 1Max-Planck Institut für Sonnensystemforschung — 2Universitätssternwarte München — 3Instituto de Astrofísica de Andalucía — 4Thüringer Landessternwarte Tautenburg
Comet ISON came from the Oort Cloud (10000 - 100000 AU), the outermost region of the Solar System, where the debris from the formation of giant planets and possible extra-solar comets are stored since the early days of the Sun's existence. The overall chemistry of the comet appears to be normal suggesting a solar origin. During approach to the Sun it was active at least since it passed 9.4AU displaying enhanced activity most likely driven by CO2 and CO ice sublimation. From about 2.5 AU inwards water ice sublimation dominated the activity of the km size nucleus producing a gas and dust coma of 100000 km extension and a several Million km long plasma and dust tails most of which were seen overlapping from Earth.