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EP: Fachverband Extraterrestrische Physik

EP 5: Postersitzung

EP 5.20: Poster

Dienstag, 18. März 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.