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The NASA Discovery mission EPOXI, utilizing the Deep Impact flyby spacecraft,comprises two phases: EPOCh (Extrasolar Planet Observation andCharacterization) and DIXI (Deep Impact eXtended Investigation). With EPOCh, weuse the 30-cm high resolution visible imager to obtain ultraprecise photometriclight curves of known transiting planet systems. We will analyze these data forevidence of additional planets, via transit timing variations or transits; forplanetary moons or rings; for detection of secondary eclipses and theconstraint of geometric planetary albedos; and for refinement of the systemparameters. Over a period of four months, EPOCh observed four known transitingplanet systems, with each system observed continuously for several weeks. Herewe present an overview of EPOCh, including the spacecraft and science goals,and preliminary photometry results.

The NASA EPOXI mission of opportunity to gather ultraprecise photometry of known transiting exoplanets