Modeling the nucleus and jets of comet 81 P/Wild 2 based on the Stardust encounter data

被引:92
作者
Sekanina, Z
Brownlee, DE
Economou, TE
Tuzzolino, AJ
Green, SF
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] Univ Washington, Dept Astron, Seattle, WA 98195 USA
[3] Univ Chicago, Enrico Fermi Inst, Lab Astrophys & Space Res, Chicago, IL 60637 USA
[4] Open Univ, Planetary & Space Sci Res Inst, Milton Keynes MK7 6AA, Bucks, England
关键词
D O I
10.1126/science.1098388
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We interpret the nucleus properties and jet activity from the Stardust spacecraft imaging and the onboard dust monitoring system data. Triangulation of 20 jets shows that 2 emanate from the nucleus dark side and 16 emanate from sources that are on slopes where the Sun's elevation is greater than predicted from the fitted triaxial ellipsoid. Seven sources, including five in the Mayo depression, coincide with relatively bright surface spots. Fitting the imaged jets, the spikelike temporal distribution of dust impacts indicates that the spacecraft crossed thin, densely populated sheets of particulate ejecta extending from small sources on the rotating nucleus, consistent with an emission cone model.
引用
收藏
页码:1769 / 1774
页数:6
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