To make meaningful observations of Jupiter, you will need access to an adequate telescope. There's the big question! What is an adequate telescope? What type of telescope is best? What is the minimum size telescope required? Many observers prefer refractors, others prefer Newtonian reflectors, many astronomers make meaningful observations with Schmidt-cassegrains, and some with exotic types. It is easy to understand why the beginner could be easily confused.
I believe that a refractor of at least 4-in. aperture or a reflector of at least 6-in. aperture is the minimum size needed to engage in serious observations of Jupiter. Telescopes of smaller size will not provide enough resolution. The term resolution refers to the ability of a telescope to resolve small details. In no other activity is it more important, that a good big one is better than a good little one. In planetary observing, size can give you an advantage. Normally, the larger the aperture of the telescope lens, the better its resolving power. The resolving power of a telescope can be stated in terms of the Dawes limit. The Dawes limit is expressed by the formula:
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