In
celestial mechanics, a
Kepler orbit (or
Keplerian orbit) describes the motion of an orbiting body as an
ellipse,
parabola, or
hyperbola, which forms a two-dimensional
orbital plane in three-dimensional space. (A Kepler orbit can also form a
straight line.) It considers only the point-like gravitational attraction of two bodies, neglecting
perturbations due to gravitational interactions with other objects,
atmospheric drag,
solar radiation pressure, a non-
spherical central body, and so on. It is thus said to be a solution of a special case of the
two-body problem, known as the
Kepler problem. As a theory in
classical mechanics, it also does not take into account the effects of
general relativity. Keplerian orbits can be
parametrized into six
orbital elements in various ways.