SOHO/SWAN H Lyman-alpha Observations Of Comets C/2006 P1 McNaught, C/2006 M4 SWAN, C/2007 N1 Lulin And 67P/Churyumov-Gerasimenko

Details SOHO/SWAN H Lyman-alpha Observations Of Comets C/2006 P1 McNaught, C/2006 M4 SWAN, C/2007 N1 Lulin And 67P/Churyumov-Gerasimenko SOHO/SWAN H Lyman-alpha Observations Of Comets C/2006 P1 McNaught, C/2006 M4 SWAN, C/2007 N1 Lulin And 67P/Churyumov-Gerasimenko

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.1510c&link_type=abstract

American Astronomical Society, DPS meeting #41, #15.10

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SWAN, the all-sky hydrogen Lyman-alpha camera on the SOHO spacecraft, is designed primarily to image the interplanetary neutral hydrogen around the sun. SWAN has an ongoing campaign to observe comets in addition to making serendipitous observations of comets as part of the full-sky monitoring program. SWAN can therefore observe comets continuously over large portions of their apparitions to the north and south of the ecliptic and at reasonably small solar elongation angles. Because of SOHO's location at the L1 Lagrange point, SWAN provides excellent temporal coverage of water production. For comets that are bright enough we also use our time-resolved model (TRM) that deconvolves daily-average water production rates from an entire sequence of images over many days to several weeks and even months. We report here results of our analyses of some recently observed comets. These include 2006 P1 McNaught, 2006 M4 SWAN, 2007 N1 Lulin, and 67P/Churyumov-Gerasimenko. We also present the results of our growing survey of comets that is yielding some interesting comparisons of water production rate variations with heliocentric distance.
This work was partially supported by grants NNG08A044G from the NASA Planetary Astronomy Program and NNX06AB60G from the NASA Outer Planets Research Program. SOHO is a mission of international cooperation between ESA and NASA. SWAN was financed in France by CNES with support from CNRS and in Finland by TEKES and the Finnish Meteorological Institute.

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