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dc.contributor.authorKüppers, Michael-
dc.contributor.authorRengel, Miriam-
dc.contributor.authorKeller, H. U.-
dc.contributor.authorGutiérrez, Pedro J.-
dc.contributor.authorHviid, Stubbe F.-
dc.identifier.citation39th Annual Meeting of the Division for Planetary Sciences of the American Astronomical Association (DPS 2007)en_US
dc.descriptionContribution presented at the 39th Annual Meeting of the Division for Planetary Sciences of the American Astronomical Association (DPS 2007), October 7-12, 2007 Orlando, Florida.en_US
dc.description.abstractWhen Deep Impact fired its projectile into the nucleus of comet 9P/Tempel 1, a cloud made of dust and icy grains was ejected from the impact crater. The dust was subsequently accelerated by gas drag. About a week after the impact event, the dust cloud has dispersed due to its expansion and the force exerted by solar radiation pressure. The light curve of the dust cloud contains information about its formation and evolution: the time scale of the production of impact created material can be derived from the time scale of the brightness increase. The velocity distribution of the cloud is indicative of acceleration processes in the inner coma of the comet. Finally, the abundance of large dust particles created by the impact can be estimated from the brightness of the cloud several days after the impact when small particles have been pushed away by radiation pressure.en_US
dc.description.abstractHere we analyze data obtained by the Narrow Angle Camera (NAC) of OSIRIS onboard the ESA spacecraft Rosetta to derive the velocity distribution of the dust cloud from an inversion of its light curve. OSIRIS observed comet Tempel 1 near-continuously for more than two weeks around the impact. A model of the expansion of the ejecta is compared to the light curve seen by the NAC. We derive a broad velocity distribution of the dust particles, which peaks at around 225 m/s, in good agreement with published estimates. The velocity suggest that the impact ejecta were quickly accelerated by gas in the cometary coma. We will discuss implications of our results for the evolution of the dust cloud during the first hours after the impact and provide estimates of the released dust mass.en_US
dc.description.sponsorshipWe acknowledge the funding of the agencies ASI, CNES, DLR, the Spanish Space Program (Ministerio de Educación y Ciencia), SNSB and ESA.en_US
dc.format.extent25341052 bytes-
dc.publisherAAS Division of Planetary Sciencesen_US
dc.subjectComet 9P/Tempel 1en_US
dc.subjectDeep Impact spacecraften_US
dc.subjectProjectile impacten_US
dc.subjectDust clouden_US
dc.subjectLight curveen_US
dc.subjectVelocity distributionen_US
dc.subjectNarrow Angle Camera (NAC)en_US
dc.subjectRosetta spacecraften_US
dc.titleThe Light Curve Of The Dust Cloud Ejected By The Collision Between The Deep Impact Projectile And The Nucleus Of Comet 9P/Tempel 1en_US
dc.typepóster de congresoen_US
dc.description.peerreviewedPeer revieweden_US
Appears in Collections:(IAA) Comunicaciones congresos
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