FM9p.18 — Rotational Variation of Outgassing Morphology in 67P/Churyumov-Gerasimenko

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Aug 10th at 6:00 PM until 6:00 PM

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Author(s): Michael F. A'Hearn10, Dennis Bodewits10, Fiorangela La Forgia11, Luisa M. Lara2, Jessica Agarwal5, Jean-Loup Bertaux3, Gabriele Cremonese7, Björn Davidsson12, Sonia Fornasier4, Carsten Güttler5, Jorg Knollenberg1, Monica Lazzarin11, Cedric Leyrat4, Zhong-Yi Lin6, Sara Magrin11, Giampiero Naletto11, Holger Sierks5, Colin Snodgrass8, Nicolas Thomas9, Cecilia Tubiana5, Jean-Baptiste Vincent5

Institution(s): 1. Deutsches Zentrum für Luft- und Raumfahrt, 2. Instituto Astrofisica de Andalucia, 3. LATMOS, 4. LESIA - Observatoire de Paris, 5. MPS Sonnensystemforschung, 6. National Central University, 7. Osservatorio Astronomico di Padova, 8. The Open University, 9. Uiversität Bern, 10. University of Maryland, 11. University of Padova, 12. Uppsala University

Images of the innermost coma of comet 67P/Churyumov-Gerasimenko taken in various gaseous species with the OSIRIS camera on Rosetta show localized sources that expand hemispherically, contrary to the narrow jets seen in broad band images, which are domnated by continuum radiation reflected by the grains. The gaseous images have the continuum removed, but we have not derived column densities because of uncertainty about physical processes. Thus the morphology is the most reliable aspect of the data. We will compare the morphology in various species and attempt to estimate the decoupling distance of the grains from the gas. We will also attempt to relate these features to the point of origin on the nucleus.