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The Kepler Mission is searching for Earth-size planets orbiting solar-likestars by simultaneously observing >160,000 stars to detect sequences of transitevents in the photometric light curves. The Combined Differential PhotometricPrecision (CDPP) is the metric that defines the ease with which these weakterrestrial transit signatures can be detected. An understanding of CDPP isinvaluable for evaluating the completeness of the Kepler survey and inferringthe underlying planet population. This paper describes how the Kepler CDPP iscalculated, and introduces tables of rms CDPP on a per-target basis for 3-, 6-,and 12-hour transit durations, which are now available for all Keplerobservations. Quarter 3 is the first typical set of observations at the nominallength and completeness for a quarter, from 2009 September 18 to 2009 December16, and we examine the properties of the rms CDPP distribution for this dataset. Finally, we describe how to employ CDPP to calculate target completeness,an important use case.

The Derivation, Properties and Value of Kepler's Combined Differential Photometric Precision