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Dysnomia (moon of Eris)

Dysnomia, is a moon of the dwarf planet Eris.

The satellite is about 60 times fainter than Eris, and its diameter is estimated to be approximately eight times smaller.

Astronomers now know that three of the four brightest Kuiper belt objects (KBOs) have satellites, while among the fainter members of the belt only about 10% are known to have satellites.

Note:   The above text is excerpted from the Wikipedia article "Dysnomia (moon of Eris)", which has been released under the GNU Free Documentation License.
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