The Charon-to-Pluto mass ratio of 0.117 (≈ ​2⁄17) is close enough to 1 that Pluto and Charon have frequently been described by many scientists as "double dwarf planets" ("double planets" prior to the 2006 definition of "planet").
Rasio massa Charon-to-Pluto sebesar 0.117 (≈ 2/17) cukup dekat dengan 1 bahwa Pluto dan Charon sering digambarkan oleh banyak ilmuwan sebagai "planet kerdil ganda" ("planet ganda" sebelum definisi 2006 tentang " Planet ").