What would happen if a planet was surrounded by an unusually large amount of dark matter/energy?

Let's say we have a planetary system that has somehow attracted an unusually high amount of dark matter and dark energy. We can hand-wave the physics and any impossibilities behind the method of that attraction and assume that this amount, while significant, remains essentially constant. There's just a planet with a lot of dark matter and energy around it.

As for just how much there is of this "unusually high amount", let's just say there's enough to have observable effects, however much that may be.

What are those noticeable effects? What could we see in local celestial mechanics? Would the planet rotate faster? Would surface gravity be greater? That sort of thing.

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What would happen if a planet was surrounded by an unusually large amount of dark matter/energy?

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