Pluto

Pluto is a (KBO), that is the subject of scientific study by the  from NASA. The New Horizons spacecraft performed a planetary flyby study of the in 2015, which includes a secondary mission to flyby and study one or more other Kuiper belt objects (KBOs) in the decade to follow.
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New Horizons
The to Pluto will measure the interaction between solar wind and ions created by atmospheric loss from Pluto. These measurements provide a characterization of the total loss rate and will allow examination of the complex plasma interactions at Pluto for the first time. Constrained to fit within minimal resources, is optimized to make plasma-ion measurements at all rotation angles as the New Horizons spacecraft scans to image Pluto and Charon during the flyby. In order to meet these unique requirements, a cylindrically symmetric (RPA) was combined with small deflectors, a top-hat analyzer, and a redundant/coincidence detection scheme. This configuration will allow for highly sensitive measurements and a controllable energy passband at all scan angles of the spacecraft.