title: Modeling the nucleus and jets of comet 81P/Wild 2 based on the Stardust encounter data.
abstract: 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.
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA. zs@sek.jpl.nasa.gov
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Sekanina
authors.forename: Donald E
authors.initials: DE
authors.lastname: Brownlee
authors.forename: Thanasis E
authors.initials: TE
authors.lastname: Economou
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Tuzzolino
authors.forename: Simon F
authors.initials: SF
authors.lastname: Green
mesh_terms: D000465:Algorithms; D019443:Cosmic Dust; D019110:Meteoroids; D008962:Models, Theoretical; D012984:Software; D018531:Spacecraft
chemical_list: D019443:Cosmic Dust