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The fifth largest moon Amalthea was discovered by Barnard in 1896 using the 36" Lick refractor and was the last natural satellite in the solar system to be discovered by visual means and the first Jovian moon discovered since Galileo
Theoretically a very large amateur scope could pick it up as it has an apparent magnitude of 14.1, but it orbits very close to Jupiter itself making it very hard to pick out.
Malcolm
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