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With a small telescope/binoculars, it will be difficult or impossible to resolve details on the scale of Io's disk (about 1 arcsecond). So you wouldn't be able to use shapes in the image to distinguish the two scenarios. If you can attach a color filter, you might be able to distinguish between transit and occultation. Both Io and Jupiter are yellowish, so a ...


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Can I use 75mm Plano convex lens with 1000mm focal length tl;dr: Go for it! First see this answer to Will these simple 2 convex lens arrangement telescope see the moon clearly? but your question is quite different, not a duplicate and I think you can have some success! You will have some chromatic aberration but at f/12.5 it won't be so strong, and you ...


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