By Xu H.

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ENCOUNTER PHASE The encounter phase begins 5 days before and ends 1 day after the impact with Comet Tempel 1. This period includes the two final targeting maneuvers before release of the impactor, the 24-h impactor mission after release to achieve an impact on the lighted side of the comet nucleus, the deflection maneuver and subsequent imaging sequence for the flyby spacecraft during its close flyby of the nucleus with observations of the impact event and the resulting crater, and the playback of all the collected data.

Some events early in the cruise phase, such as the end of the HRI bakeout, still vary with the actual launch date. 38 W. H. 4. APPROACH P HASE The approach phase extends from 60 days before encounter until 5 days before encounter (E−60 days to E−5 days, 5 May to 29 June 2005). This is the period of intensive observations to detect the nucleus of Comet Tempel 1 using the HRI and then refine the spacecraft and comet ephemerides. It also includes regular science observations of the comet, payload testing, and two maneuvers (TCM-3A and 3B) to target the exact encounter time.

89 AU, Sun-Earth-Comet angle 76◦ ). Possible extended missions to these two targets are under study, but will depend on favorable interest from NASA, accurate launch conditions that conserve the propellant reserves, and the survival of the flyby spacecraft and payload during the passage through the inner coma at Tempel 1. Acknowledgments This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

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