  Oks proposes the existence of a new class of stable planetary orbits around
binary stars, in the shape of a helix on a conical surface whose axis of
symmetry coincides with the interstellar axis. We show that this claim relies
on the inappropriate use of an effective potential that is only applicable when
the stars are held motionless, and that the existence of the torques required
to maintain the proposed orbits would have been empirically detected in the
motion of artificial satellites in high-inclination orbits.
