Not necessarily, the apparent magnitude is the issue here, not resolving power. Located at a comparable distance, Deimos, the smaller moon of Mars, reaches at m

Not necessarily, the apparent magnitude is the issue here, not resolving power. Located at a comparable distance, Deimos, the smaller moon of Mars, reaches at most magnitude ~12.5, meaning that any telescopes smaller than 6" to 8" might not even be able to ever detect it's there. And we're talking about a 6.2Km sized moon, not an object with an overall visible area ~40000 times smaller - that would mean an apparent magnitude of ~23-24 as seen from Earth, meaning only the most powerful telescopes on Earth would be barely able to detect that "unresolved dot" - provided it had the same albedo of Deimos. https://en.wikipedia.org/wiki/Deimos_(moon) https://en.wikipedia.org/wiki/Deimos_(moon) https://en.wikipedia.org/wiki/Apparent_magnitude https://en.wikipedia.org/wiki/Apparent_magnitude Edit: corrected