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Recent transit surveys have discovered thousands of planetary candidates withdirectly measured radii, but only a small fraction have measured masses.Planetary mass is crucial in assessing the feasibility of numerousobservational signatures, such as radial velocities (RVs), atmospheres, moonsand rings. In the absence of a direct measurement, a data-driven, probabilisticforecast enables observational planning and so here we compute posteriordistributions for the forecasted mass of approximately seven thousand KeplerObjects of Interest (KOIs). Our forecasts reveal that the predicted RVamplitudes of Neptunian planets are relatively consistent, as a result oftransit survey detection bias, hovering around the few m/s level. We find thatmass forecasts are unlikely to improve through more precise planetary radii,with the error budget presently dominated by the intrinsic model uncertainty.Our forecasts identify a couple of dozen KOIs near the Terran-Neptunian dividewith particularly large RV semi-amplitudes which could be promising targets tofollow-up, particularly in the near-IR. With several more transit surveysplanned in the near-future, the need to quickly forecast observationalsignatures is likely to grow and the work here provides a template example ofsuch calculations.

Forecasted masses for seven thousand KOIs