The New Horizons team had spent three fruitless years using ground-based telescopes to find a Kuiper Belt Object that will be within range of New Horizons after its July 14, 2015, flyby of Pluto. Last month, scientists got two weeks of observing time on Hubble for initial scans.

The deal was that if they found at least two candidates, they could have another 160 orbits worth of telescope time to ferret out a second suitable target for New Horizons…
 
The Kuiper Belt is an area of icy bodies left over from the formation of the solar system…

Analysis of an initial 200 Hubble images, taken between June 16 and June 26, showed that at least two Kuiper Belt Objects might be within range of New Horizons…

A more detailed search is scheduled to begin this month and conclude in August.