For purposes of realistic, but otherworldly visualisations of foreign worlds I'm wondering what the fastest speed is that a moon will track through the visible sky, as observed from the body of a planet (or other moon).
As in, the moon rises, the observer watches it move across the sky, and the moon sets on the opposite horizon.
My intuition says that there exist a bunch of limits here... Orbital (angular) velocities depend on orbital height, and there are limits to that depending on the masses of two bodies. Then the rotation of the observers planet/moon plays a role too, but I assume there are limits here as well in terms of what is realistic or physically stable for celestial bodies.
How quickly could a moon appear and disappear after tracking once through the sky overhead? Hours? Minutes? Less?
- The planet/moon the observer is standing on can support... well a human observer standing on it. At least in a spacesuit - so this gives certain upper/lower bounds in terms of g-force/size/mass.
- The orbital system is stable (more or less) - so no rogue moon flashing by.
- Assume the moons track in the sky traverses through the zenith (so not just shortly peeking over the horizon for a second, as the sun does in arctic fall/spring).