WATER PRODUCTION BY COMET 103P/HARTLEY 2 OBSERVED WITH THE SWAN INSTRUMENT ON THE SOHO SPACECRAFT

被引：44

作者：

Combi, M. R. ^{[1
]}

Bertaux, J-L ^{[2
]}

Quemerais, E. ^{[2
]}

Ferron, S. ^{[3
]}

Makinen, J. T. T. ^{[4
]}

机构：

[1] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA

[2] Univ Versailles St Quentin, CNRS INSU, LATMOS, F-78280 Guyancourt, France

[3] ACRI St, Sophia Antipolis, France

[4] Finnish Meteorol Inst, SF-00101 Helsinki, Finland

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 734卷 / 01期

关键词：

comets: general; comets: individual (103P/Hartley 2); molecular processes; TEMPORAL DECONVOLUTION; NUCLEUS; MODELS; BELT;

D O I：

10.1088/2041-8205/734/1/L6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Global water production rates were determined from the Ly alpha 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 similar to 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 similar to 0.5 km(2), about half of the mean cross section of the nucleus. Outside this period it was similar to 0.2 km(2). The peak value was 90%, implying a significant water production by released nucleus icy fragments.

引用

页数：5

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