Objects (such as
C/1980 E1) on an outbound
ejection trajectory will show an
eccentricity greater than 1, an
apoapsis distance of AD= 9.99E+99 and an
orbit period of PR= 9.99E+99. For objects orbiting the Sun, this is best computed at an
epoch (date) when the object is outside of the planetary region of the Solar System and no longer subject to notable planetary
perturbation. Due to the
galactic tide and
passing stars it is impossible to know if an object with a weak hyperbolic trajectory will truly be ejected or gently nudged back inward. The galactic tide and passing stars can also cause objects inbound from the Oort cloud to have a weakly hyperbolic trajectory. == Overview of usage==