Water production rates of recent comets (2015) by SOHO/SWAN and the SOHO/SWAN survey

Abstract : The all-sky hydrogen Lyman-alpha camera, SWAN (Solar Wind Anisotropies), on the SOlar and Heliospheric Observatory (SOHO) satellite makes observations of the hydrogen coma of comets. Most water molecules produced by comets are ultimately photodissociated into two H atoms and one O atom producing a huge atomic hydrogen coma that is routinely observed in the daily full-sky SWAN images in comets of sufficient brightness. Water production rates are calculated using our time-resolved model (Mäkinen & Combi, 2005, Icarus 177, 217), typically yielding about 1 observation every 2 days on the average for each comet. Here we describe the progress in analysis of observations of comets observed in 2015 and those selected from the archive for analysis. These include comets C/2013 US10 (Catalina), C/2014 Q1 (PanSTARRS), and possibly 67P/Churyumov-Gerasimenko. A status update on the entire SOHO/SWAN archive of water production rates in comets will also be given. SOHO is an international cooperative mission between ESA and NASA. Support from grants NNX11AH50G from the NASA Planetary Astronomy Program and NNX13AQ66G from the NASA Planetary Mission Data Analysis Program are gratefully acknowledged, as is support from CNRS, CNES, and the Finnish Meteorological Institute (FMI).
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Submitted on : Thursday, November 12, 2015 - 5:12:51 PM
Last modification on : Wednesday, August 7, 2019 - 2:34:16 PM

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Michael R. Combi, J. Teemu T. Mäkinen, Jean-Loup Bertaux, Eric Quémerais, Stéphane Ferron. Water production rates of recent comets (2015) by SOHO/SWAN and the SOHO/SWAN survey. 47th DPS Annual Meeting, Nov 2015, Washington, United States. pp.413.14. ⟨insu-01228142⟩

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