The Conjunction Assessment task at NASA Goddard Space Flight Center providesconjunction risk assessment for many NASA robotic missions. These riskassessments are based on several figures of merit, such as miss distance, Probabilityof Collision (Pc), and orbit determination solution quality. However,these individual metrics do not singly capture the overall risk associated with aconjunction, making it difficult for someone without this complete understandingto take action, such as an avoidance maneuver. The goal of this analysis isto introduce a single risk index metric that can easily convey the level of riskwithout all the technical details. The proposed index is called the conjunction“F-value.” This paper presents the concept of the F-value and the tuning of themetric for use in routine Conjunction Assessment operations.
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