SOHO/SWAN H Lyman-alpha Observations Of Comets C/2002 X5 Kudo-Fujikawa, C/2002 V1 NEAT, C/2002 Q2 Machholz And 21P/Giacobini- Zinner

Details SOHO/SWAN H Lyman-alpha Observations Of Comets C/2002 X5 Kudo-Fujikawa, C/2002 V1 NEAT, C/2002 Q2 Machholz And 21P/Giacobini- Zinner SOHO/SWAN H Lyman-alpha Observations Of Comets C/2002 X5 Kudo-Fujikawa, C/2002 V1 NEAT, C/2002 Q2 Machholz And 21P/Giacobini- Zinner

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.1608c&link_type=abstract

American Astronomical Society, DPS meeting #40, #16.08; Bulletin of the American Astronomical Society, Vol. 40, p.412

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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 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 our results of observations of some interesting target comets picked from the extensive SWAN archive. These include three Oort cloud comets C/2002 X5 Kudo-Fujikawa, C/2002 V1 NEAT and C/2002 Q2 Machholz and the 2005 apparition of periodic comet 21P/Giacobini-Zinner. For their water production rates and heliocentric distance (r) variation the results are as follows: 5.6x1028 r-2.0 s-1 for X5 Kudo-Fujikawa, 9.4x1028 r-2.1 s-1 for V1 NEAT, and 4.8x1029 r-1.9 s-1 for Q2 Machholz. For 21P/G-Z we find for the covered pre-perihelion period 7.8x1028 r-2.1 s-1 was consistent with past apparitions from H and OH observations. 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 grant 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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