I have just found out that the Milankovitch Cycle, a machination responsible for the creation of the Pleistocene ice ages, has its part played partly by orbit from the entire solar system. As a result of the orbit we already have back home, the cycles--on average--work as follows:
- Eccentricity (orbital shape): Varying between 0.000055 and 0.0679 over the course of 100,000 years.
- Obliquity (axial tilt): Varying between 22.1 and 24.5 degrees over the course of 41,000 years.
- Axial precession (change in the orientation of the rotational axis on a rotating body): Polaris being the North Star for a total of 26,000 degrees.
In this alternate solar system, the changes are as follows:
- Mercury is twice as wide as Earth and eight times as massive, orbiting the sun from a distance of 5.5 million miles
- Venus is 175% the width of Earth and 5.5 times as massive, orbiting the sun from a distance of 65 million miles
- Earth stays right where it is, orbiting the sun from a distance of 93 million miles, but the moon is a different story. It is now 3200 miles in diameter, has only 14% of Earth's gravity and orbits Earth from a distance of 330,000 miles.
- Mars, now a waterworld, is 2.6 times as wide as Earth and seven times as massive. It orbits the sun from a distance of 141.6 million miles.
- Jupiter, Saturn and Uranus have each doubled in diameter. Their distances from the sun are 500 million, 900 million and two billion miles.
- Neptune and Pluto simply don't exist.
With this list, I was told that such changes wouldn't have any dramatic effects on gravitational pertubations.
With that in mind, how would these changes affect the durations and extent of Earth's Milankovitch cycles?