Dysnomia

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Dysnomia
Dysnomia —is the only known moon of the dwarf planet Eris. Assuming its albedo is five times lower than Eris's, its diameter would be 685±50 km, meaning that Dysnomia is itself likely a rather large Trans-Neptunian object. Of the Solar System's dwarf planet and minor planet moons, only Charon is definitely larger than Dysnomia. Dysnomia (moon) - Wikipedia, the free encyclopedia
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Short Description Dysnomia —is the only known moon of the dwarf planet Eris. Assuming its albedo is five times lower than Eris's, its diameter would be 685±50 km, meaning that Dysnomia is itself likely a rather large Trans-Neptunian object. Of the Solar System's dwarf planet and minor planet moons, only Charon is definitely larger than Dysnomia. Dysnomia (moon) - Wikipedia, the free encyclopedia
Discovered by Michael E. Brown
Discovery date September 10, 2005
Type Moon
AddInfo Eris I
Satellite of Eris
Minor planet number 136199 Eris I
Orbit Prograde
Rotation Direct
Apoapsis 05 38 000 km
Periapsis 05 37 000 km
Semi-major axis 05 37 350 km
Distance from Sun 02 67.781 au /1
Eccentricity 0.013
Orbital period 15.774 days
Orbital speed  0.172 km/s
Inclination to the equator 142°
Diameter/Size 03 684 ± 50 km
Mass 1019×1 kg
Apparent magnitude 23.1
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