Right: - "Since we saw it so briefly, our knowledge of its orbit is not that great" - "[for example, in 2016 the data shows] a large chunk of sky where it cou

Right: - "Since we saw it so briefly, our knowledge of its orbit is not that great" - "[for example, in 2016 the data shows] a large chunk of sky where it could have been, and [the object is quite small." - "Our knowledge of the diameter of this object is a bit fuzzy, because of surface reflectivity,"