non-periodic comets
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Difino
Non-periodic comets are seen on only one occasion. They are usually on near-parabolic orbits that will not return to the vicinity of the Sun for thousands of years, if ever.
The official names of non-periodic comets begin with a "C"; comets that have been lost or disappeared have names that begin with a "D". An example of the latter is Comet Lexell (D/1770 L1), which is known to have been ejected from the solar system by Jupiter.
The following is a partial list of non-periodic comets that have appeared in the solar system:
Source: [wikipedia: list of non-periodic comets]






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