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Article Dans Une Revue The Astrophysical journal letters Année : 2011

Water Production by Comet 103P/Hartley 2 Observed with the SWAN Instrument on the SOHO Spacecraft

Résumé

Global water production rates were determined from the Lyα emission of hydrogen around comet 103P/Hartley 2, observed with the SWAN (Solar Wind Anisotropies) all-sky camera on the SOHO spacecraft from 2010 September 14 through December 12. This time period included the November 4 flyby by the EPOXI spacecraft. Water production was three times lower than during the 1997 apparition also measured by SWAN. In 2010, 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 within ±20 days of perihelion was ~0.5 km2, about half of the mean cross section of the nucleus. Outside this period it was ~0.2 km2. The peak value was 90%, implying a significant water production by released nucleus icy fragments.
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Dates et versions

hal-00597441 , version 1 (18-07-2020)

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M. R. Combi, Jean-Loup Bertaux, Eric Quémerais, Stéphane Ferron, J. T. T. Mäkinen. Water Production by Comet 103P/Hartley 2 Observed with the SWAN Instrument on the SOHO Spacecraft. The Astrophysical journal letters, 2011, 734 (1), pp.L6. ⟨10.1088/2041-8205/734/1/L6⟩. ⟨hal-00597441⟩
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