[zharca]

Hi, I think a big lens-shaped body would work if it had a *LOT* of spin. Lenticular vortices in gas or liquid are stable and so are very, very big ones (galaxies). Solids, even rock, eventually behave like fluids if you have planet-sizes chunks.

But I dunno if you could make it work as an orbiting planet because of the way spins and orbits are coupled (the Hamilton equations?) - this would be right off the scale! There might be somebody on the list who can do the math, it's beyond me.