Sporadic Dobstronomer
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Here is a picture of ganymede seen through a 10" scope
in Jupiters moons
A blog by Astrodob in General
Posted
I compared it with what appears in Celestia and the features match.
A rough calculation suggests a telescope that size puts 50% of the light into a spot 0.5" across. This image shows details down to about 0.2"
Amazing, but just about possible!