Conics are plane sections of a right-circular cone. These sections give birth to four different curves: circle, ellipse, parabola and hyperbola.Conics are characterized by different values of the orbital parameters.
The major semiaxis, is easily defined for the ellipse and the circle. In the case of a parabola, it is considered infinite while for an hyperbola, it is considered negative.
The eccentricity, in the case of an ellipse, will assume values ranging from 0 (for the circle) to 1. While in the case of a parabola it will assume value =1 and will be superior to 1 in the case of an hyperbola.
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