Hydrocode Modeling of Crater Excavation

Once the kinetic energy of the projectile has coupled into the target, the ensuing shock wave spreads out and initiates the excavation stage of cratering (e.g. Melosh, 1989). The shock wave first compresses, then releases the engulfed material to low pressure. In the process, this material is accelerated away from the impact site and eventually opens a crater as comet surface materials are both displaced further downward into the comet or ejected from the surface. The most visible part of this...

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The 1a Impactor targeting error that results from maneuver execution errors over the range of expected AY values. One could break down the Flyby spacecraft's encounter goals into two main categories 1) establish an accurate trajectory relative to the center of the nucleus and 2) point the instruments at the impact site and continue tracking the crater during formation and for as long as possible to the end of the post-impact Science observations. Compared to the Impactor, the Flyby s...

Data Processing Pipeline

Each raw DI instrument frame is initially stored on the spacecraft as a single data file. The data files are broken up into data packets, which are downlinked via the DSN to the Jet Propulsion Laboratory Advanced Multimission Operations System (JPL AMMOS). AMMOS decommutates the packets to recreate the original raw observations. In data terms, the raw observations are simply a stream of data in a compact, mission-specific format unsuitable for scientific analysis. 6.2. Science Data Center...

Info

A subset of the impact data is selected for real-time downlink by not selecting every time sample. All the data are compressed to 8 bits except for HRI and MRI images at I+10 s and I+21 s. As the crater develops and ejecta continues to flow outward, we intend to monitor this continuing process (crater formation is nominally expected to be complete within about 4 min). Sampling with all the Flyby instruments continues however, the sampling rate gradually decreases and the FOVs are progressively...

Anticipated Properties of the Surface and Subsurface

An important issue for the Deep Impact mission is the identification of possible correlations between localized areas (active areas) and jet activity in the inner coma. As an example, the results of such a study for comet 81P Wild 2 have recently been reported by Sekanina et al. (2004). They find that cometary activity can flourish perhaps even in unilluminated regions - already an important result that needs confirmation. in the case of 9P Tempel 1 there are many pieces of evidence suggesting...

Formal Education Products and Programs

Jochen Kiesel

Educational units for school-aged children from elementary, middle and high school have been developed. Materials for grades K-4 are called activities. For middle school and high school, we developed educational modules that consist of guides for both students and teachers, and include alignment with science and or math educational standards. All materials can be used in both formal classrooms and informal settings such as community or after school programs. The modules were reviewed by...

Surface Morphology of Comets

Spacecraft imaging during the past decade has documented a wide variety of processes that determine the evolution of asteroid surfaces. As noted by Malin 1985 , comets, thanks to their activity, hold the potential for even greater diversity in terms of surface processes and morphological forms. Although considerable effort has been devoted to modeling the activity of comets, most such models do not address surface processes in a comprehensive manner, nor make specific predictions of surface...