Fig. 1
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Up–cos θp plane. The curve in the lower right corner is the condition Lz,p = 0, expressed by Eq. (11), which divides prograde orbits (upwards and to the left of the curve) from retrograde orbits. The other line is the parabolic condition, separating elliptical orbits (on the left of the line) from the hyperbolic ones (on the right). For the meaning of the red dots, see the text.
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