In my fictional world I have selected all parameters to maximize the Hills Sphere of my planet. The planet has three times Earth's mass and it is located in 2 AU from its star that's 1.4 times more massive than our Sun.
I want to have three moons on a 1:2:4 resonance. I also want:
- the first one to be as large as our moon to the sky
- the second 1.5 times larger
- and the third, half our moon's size.
To achieve this I have assumed:
- the first moon having 1.1 lunar radius,
- the second 2.3
- and the third 1.1.
Their orbits are 18, 36, 72 days.
I don't really care about their density and I assumed that their masses are
- 1 lunar mass (probably rocky)
- 3 lunar mass (water or ice world)
- 0.3 lunar mass (probably ice world)
This is my effort to achieve the stability of the system, what parameters should I reconsider to make it more stable? I am willing to change almost everything even the resonance, but I want them to be visible from my planet in the way moon is to Earth.
So any ideas?