Water Production Rate Variation of Comet 103P/Hartley 2

Details Water Production Rate Variation of Comet 103P/Hartley 2 Water Production Rate Variation of Comet 103P/Hartley 2

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1295c&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1295

Physics

Scientific paper

The SWAN all-sky Lyman-α camera on the Solar and Heliospheric Observatory (SOHO) satellite observed the EPOXI target comet throughout its 1997 and 2010 apparitions [1]. The water production rates, derived from the hydrogen coma distributions, were 3 times lower in 2010 than in 1997 [2]. There were very steep variations of production rate with heliocentric distance in both apparitions, typical of Jupiter Family Comets. It increased by a factor of ~2.5 within one day on September 30 with a similar corresponding drop between November 24 and 30. The total surface area of sublimating water required to explain the production rates within ±20 days of perihelion in 2010 was about half the mean cross section of the entire nucleus with a peak value of about 90%, implying that a significant fraction of the total water production had to come from the released icy fragments.

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