These entities are the input to an inverse problem solved by Binet’s equation. Using Delaunay variables to parametrize these entities, one can show the conservation of Tisserand’s parameter. The shape of these entities may be described by the (10[1])Laplace–Runge–Lenz vector. (10[1])Bertrand’s theorem (10[1])states that these entities are only necessarily closed for two power-law potentials. The vis-viva equation describes bodies moving along these entities, which are classified as hyperbolic when the dimensionless (10[1])parameter epsilon is greater than one. An object’s period is proportional (10[1])to the three-halves power of these entities’ semimajor (10[1])axis by Kepler’s third law. For 10 points, name these trajectories (10[1])of objects experiencing an attractive central force. ■END■ (10[1])