Editing Comet (section)

=== Departure (ejection) from Solar System ===

If a comet is traveling fast enough, it may leave the Solar System. Such comets follow the open path of a hyperbola, and as such, they are called hyperbolic comets. Solar comets are only known to be ejected by [[Perturbation (astronomy)|interacting]] with another object in the Solar System, such as Jupiter.<ref>{{cite journal |bibcode=1991JBAA..101..119H |title=On hyperbolic comets |last1=Hughes |first1=D. W. |volume=101 |date=1991 |pages=119 |journal=Journal of the British Astronomical Association}}</ref> An example of this is Comet [[C/1980 E1]], which was shifted from an orbit of 7.1&nbsp;million years around the Sun, to a hyperbolic trajectory, after a 1980 close pass by the planet Jupiter.<ref name=barycenter>{{cite web |author=[[JPL Horizons On-Line Ephemeris System|Horizons]] output |url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=C/1980+E1 |title=Barycentric Osculating Orbital Elements for Comet C/1980 E1 |access-date=9 March 2011}} (Solution using the Solar System [[Center of mass#Barycenter in astrophysics and astronomy|Barycenter]] and [[Barycentric coordinates (astronomy)|barycentric coordinates]]. Select Ephemeris Type:Elements and Center:@0)</ref> Interstellar comets such as [['Oumuamua|1I/ʻOumuamua]] and [[2I/Borisov]] never orbited the Sun and therefore do not require a 3rd-body interaction to be ejected from the Solar System.