Other Kuiper belt objects

Since the 1980s, hundreds of icy bodies have been detected in the Kuiper belt. Most of these objects are much smaller than Pluto. Once the orbit of a KBO is determined, it is given an official number by the Minor Planet Centre of the IAU. As of early 2008, at least 84 objects have numbers and many of those have names, including: Asbolus, Bienor, Chaos, Chariklo,

Figure 13.7 Pluto (centre of diffraction lines) and its three moons, Charon, Nix and Hydra. (Photo: NASA)

Table 13.4 Main Kuiper belt objects (as of 2008)


Diameter (km)

Orbital radius (AU)

Orbital period (years)

Orbital eccentricity

Number of moons


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