Satellite Eris (dwarf planet)
in 2005, adaptive optics team @ keck telescopes in hawaii carried out observations of 4 brightest tnos (pluto, makemake, haumea, , eris), using newly commissioned laser guide star adaptive optics system. images taken on september 10 revealed moon in orbit around eris. in keeping xena nickname in use eris, brown s team nicknamed moon gabrielle , after television warrior princess sidekick. when eris received official name iau, moon received name dysnomia, after greek goddess of lawlessness eris s daughter. brown says picked similarity wife s name, diane. name retains oblique reference eris s old informal name xena, portrayed on tv lucy lawless.
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