Choosing axial tilt for human habitable planet for largest temperature variations

I have planet with twice the radius of Earth, with its core being the same absolute size as Earth's in order to provide magnetosphere, and the rest of the planet made of silicates like Earth's mantle. There are oceans on the surface with similar depths to Earth's, covering 2/3 of the surface.

I chose those numbers in order to have the largest terrestrial planet, while keeping the mass below 10 Earth masses in order to not keep the hydrogen. With twice the radius and planet mostly made of silicates, I expect the density to be about 4.4g/cm$^3$ which would give me around 1.6g surface gravity. I don't know how to calculate the compression effect on the silicates.

The planet has a satellite similar in size to Mars, and it's placed in the middle of the habitable zone of an Orange dwarf in near circular orbit.

I want the planet to have the largest temperature variations (very hot summers, very cold winters) throughout most of the planet, not just in poles or just in the equator thus axial tilt of 90% doesn't work for me. I don't want people to live just near the poles, or just near the equator. I want to achieve large seasonal variations on as large area of the planet as possible.

What kind of axial tilt would you recommend choose, 45°, 60°?

posted about 8 years ago

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