Adjective
long-period (not comparable)
(astronomy) Synonym of non-periodic
long period
All long-period comets have very large orbits, on the order of thousands of AU, and appear from every direction in the sky. Source: Internet
Although no confirmed direct observations of the Oort cloud have been made, it may be the source of all long-period and Halley-type comets entering the inner Solar System, and many of the centaurs and Jupiter -family comets as well. Source: Internet
Based on their orbits, it is suggested they were long-period comets that were captured by the gravity of the giant planets and sent into the inner Solar System. Source: Internet
By definition long-period comets remain gravitationally bound to the Sun; those comets that are ejected from the Solar System due to close passes by major planets are no longer properly considered as having "periods". Source: Internet
Strömgren took the well-determined orbits of long-period comets and projected them backward in time to before the comets had entered the planetary region. Source: Internet
Oort became interested in the problem of where the long-period comets came from. Source: Internet