Keith Weisz will show the PBS Nova Video "Pluto and Beyond." It was first broadcast in Jan of 2019. One segment of the video shows exactly how they derived the orbit and the shape of486958 Arrokoth (Ultima Thule) using the same occultation techniques that Carol Evans and CLAS used.

When the New Horizons spacecraft whizzed by Pluto in 2015, we Earthlings were dazzled by the breathtaking images it beamed home. They revealed a never-before-seen alien landscape — a world of mountains made of ice mixed with plains of frozen-solid methane and nitrogen. After more than two years of poring over the data, NASA has made remarkable new discoveries about every-one's favorite dwarf planet.