 The objects' diameters were estimated to be in the 30–55 km range; too small to be seen by ground telescopes, at distances from the Sun of 43–44 AU, which would put the encounters in the 2018–2019 period.The initial estimated probabilities that these objects were reachable within "New Horizons" fuel budget were 100%, 7%, and 97%, respectively.All were members of the "cold" (low-inclination, low-eccentricity) classical Kuiper belt, and thus very different from Pluto.