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We present a new catalog of Kepler planet candidates that prioritizesaccuracy of planetary dispositions and properties over uniformity. This catalogcontains 4376 transiting planet candidates, including 1791 residing within 709multi-planet systems, and provides the best parameters available for a largesample of Kepler planet candidates. We also provide a second set of stellar andplanetary properties for transiting candidates that are uniformly-derived foruse in occurrence rates studies. Estimates of orbital periods have beenimproved, but as in previous catalogs, our tabulated values for perioduncertainties do not fully account for transit timing variations (TTVs). Weshow that many planets are likely to have TTVs with long periodicities causedby various processes, including orbital precession, and that such TTVs implythat ephemerides of Kepler planets are not as accurate on multi-decadaltimescales as predicted by the small formal errors (typically 1 part in $10^6$and rarely $ > 10^{-5}$) in the planets' measured mean orbital periods duringthe Kepler epoch. Analysis of normalized transit durations implies thateccentricities of planets are anti-correlated with the number of companiontransiting planets. Our primary catalog lists all known Kepler planetcandidates that orbit and transit only one star; for completeness, we alsoprovide an abbreviated listing of the properties of the two dozennon-transiting planets that have been identified around stars that hosttransiting planets discovered by Kepler.

Updated Catalog of Kepler Planet Candidates: Focus on Accuracy and Orbital Periods