Phase-space portrait of 1/−1 mean motion resonance with Jupiter associated with orbital elements of asteroid 2015 BZ509, presented in e−ϕ polar space. The variance of color and contours represent level curves of the ℋ_planar (Eq. 9). The red scatter diagram presents the results of the numerical integration in the N-body numerical model, while the yellow dashed line denotes the collision curve with the perturber.