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On 1 February 2011 the Kepler Mission released data for 156,453 starsobserved from the beginning of the science observations on 2 May through 16September 2009. There are 1235 planetary candidates with transit likesignatures detected in this period. These are associated with 997 host stars.Distributions of the characteristics of the planetary candidates are separatedinto five class-sizes; 68 candidates of approximately Earth-size (radius < 1.25Earth radii), 288 super-Earth size (1.25 Earth radii < radius < 2 Earth radii),662 Neptune-size (2 Earth radii < radius < 6 Earth radii), 165 Jupiter-size (6Earth radii < radius < 15 Earth radii), and 19 up to twice the size of Jupiter(15 Earth radii < radius < 22 Earth radii). In the temperature rangeappropriate for the habitable zone, 54 candidates are found with sizes rangingfrom Earth-size to larger than that of Jupiter. Five are less than twice thesize of the Earth. Over 74% of the planetary candidates are smaller thanNeptune. The observed number versus size distribution of planetary candidatesincreases to a peak at two to three times Earth-size and then declinesinversely proportional to area of the candidate. Our current best estimates ofthe intrinsic frequencies of planetary candidates, after correcting forgeometric and sensitivity biases, are 6% for Earth-size candidates, 7% forsuper-Earth size candidates, 17% for Neptune-size candidates, and 4% forJupiter-size candidates. Multi-candidate, transiting systems are frequent; 17%of the host stars have multi-candidate systems, and 33.9% of all the candidatesare part of multi-candidate systems.

Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data