In July of 2011 the Dawn spacecraft is scheduled to begin orbital operations at Vesta, a large main-belt asteroid. Dawn is a NASA Discovery mission that uses solar-electric low-thrust ion propulsion for both interplanetary cruise and orbital operations. Navigating between the Dawn project's four targeted science orbits at Vesta requires a plan that accounts for uncertainties not only in thrust execution, orbit determination, and other spacecraft forces, but also large uncertainties in characteristics of Vesta - such as the asteroid's gravity field and pole orientation. Accommodating these uncertainties requires strategic use of low-thrust maneuvers reserved for statistical trajectory corrections. This paper describes the placement and evaluation of low-thrust statistical maneuvers during two key phases of the Vesta mission along with a discussion of the tools, constraints, and methods used to plan those maneuvers.


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    Title :

    Dawn Statistical Maneuver Design for Vesta Operations


    Contributors:

    Conference:

    21st AAS/AIAA Space Flight Mechanics Meeting ; 2011 ; New Orlean, LA, United States


    Publication date :

    2011-02-13


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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