1. An orbital trajectory that is not closed or periodic, where an object escapes to infinity rather than returning to its starting point
A hyperbolic trajectory is an example of an open orbit.
Uma trajetória hiperbólica é um exemplo de órbita aberta.
2. In astronomy and space mechanics, a trajectory where the total orbital energy is positive, causing the orbiting body to eventually escape the gravitational influence of the central body
The comet followed an open orbit and will never return to the solar system.
O cometa seguiu uma órbita aberta e nunca retornará ao sistema solar.