A cleaner, narrower-focused improvement of How This Alternate Solar System Influences the Milankovitch Cycle, so not a duplicate.
For further clarification, eccentricity is the shape of a planet's orbit, with the value of 0 being a perfect circle and 1 or more being a parabolic or hyperbolic oval. Milutin Milankovitch used Earth's eccentricity as one of three major factors responsible for the creation of ice ages, because the shape of Earth's orbit determines the length of each season. The sun's gravitational influence plays a part in shaping Earth's orbit, but it's not alone. The two gas giants--Jupiter and Saturn--also exert their share of influence regarding Earth's orbit. And Earth is the biggest of the inner planets, so the other three don't affect it as much. End result--an eccentricity varying between 0.000055 and 0.0679, with a logarithmic mean of 0.0019.
But in an alternate solar system, Earth, its moon and its place in the solar system are the exact same, but the others aren't. Here are the different bodies listed below:
- A planet twice as wide and 8x as massive as Earth orbiting the sun from a distance of 1.13 million miles.
- A planet 175% the width and 5.5x the mass of Earth orbiting the sun from a distance of 48.26 million miles.
- A planet 2.7x as wide and 7x as massive as Earth orbiting the sun from a distance of 229 million miles.
- A brown dwarf star twice as wide and 11x as massive as Jupiter orbiting the sun from a distance of 30 AUs.
Would these specified differences affect Earth's eccentricity in any way?