Solutions of the unstable regions of Didymos. The full color spectrum corresponds to the minimum to maximum values of l as defined in Eq. (1). The red color represents the unstable region l ⩽ 0, and the blue color indicates the stable regions l ⩾ 0. The solid curves indicate the contour lines of the value of l, and the dashed curves indicate that the value of l = 0, which corresponds to balanced, normal components of the gravitational and centrifugal forces.