Asking a physicist about the center of an object is like asking a Tumblr user about thr color of the sky. The only response will be "which one?" And a sigh of exhaustion

Center of volume ≠ center of mass ≠ center of systemic gravity ≠ center of lift…

but the density of an object is variable. i mean you can define the diffrence between an orbit and a co-spiral to be based on the physical size of the denser planetary body containing the orbit center point, though that seems arbitrary.

And Pluto knows that Pluto's
Hot shit
And you know Pluto knows it
"I won't ever be a planet
It don't matter 'cause I know that I'm still"
Hot shit
"And you're hot shit too, so get out of your brain And just do what you're supposed to do"

I've been told that certain peoples mothers happen to pull the earth with a bit more force than others.