  Most future surveys designed to discover transiting exoplanets, including
TESS and PLATO, will target bright (V<13) and nearby solar-type stars having a
spectral type later than F5. In order to enhance the probability of identifying
transits, these surveys must cover a very large area on the sky, because of the
intrinsically low areal density of bright targets. Unfortunately, no existing
catalog of stellar parameters is both deep and wide enough to provide a
homogeneous input list. As the first Gaia data release exploitable for this
purpose is expected to be released not earlier than late 2017, we have devised
an improved reduced-proper-motion method to discriminate late field dwarfs and
giants by combining UCAC4 proper motions with APASS DR6 photometry, and relying
on RAVE DR4 as an external calibrator. The output, named UCAC4-RPM, is a
publicly-available, complete all-sky catalog of solar-type dwarfs down to
V<13.5, plus an extension to logg>3.0 subgiants. The relatively low amount of
contamination (defined as the fraction of false positives; <30%) also makes
UCAC4-RPM a useful tool for the past and ongoing ground-based transit surveys,
which need to discard candidate signals originating from early-type or giant
stars. As an application, we show how UCAC4-RPM may support the preparation of
the TESS (that will map almost the entire sky) input catalog and the input
catalog of PLATO, planned to survey more than half of the whole sky with
exquisite photometric precision.
