Interplanetary mission operations may be considered in four phases: the Launch Phase, the Cruise Phase, the Encounter Phase, and, depending on the state of spacecraft health and mission funding, the Extended Operations Phase. These "phases" are actually subcategories of a Flight Project's
Phase E, Mission Operations and Data Analysis, as discussed in
Chapter 7. Each of these mission operations phases, and subjects pertinent to them, are covered starting in this Chapter, and continuing in the next three Chapters.