Non-periodic comets are seen only once. They are usually on near-parabolic orbits that will not return to the vicinity of the Sun for thousands of years, if ever.
Periodic comets usually have elongated elliptical orbits, and usually return to the vicinity of the Sun after a number of decades.
The official names of non-periodic comets begin with a "C"; the names of periodic comets begin with "P" or a number followed by "P". Comets that have been lost or disappeared have names with a "D".
- List of non-periodic comets
- List of periodic comets
Famous quotes containing the words lists of, lists and/or comets:
“Behold then Septimus Dodge returning to Dodge-town victorious. Not crowned with laurel, it is true, but wreathed in lists of things he has seen and sucked dry. Seen and sucked dry, you know: Venus de Milo, the Rhine or the Coloseum: swallowed like so many clams, and left the shells.”
—D.H. (David Herbert)
“Behold then Septimus Dodge returning to Dodge-town victorious. Not crowned with laurel, it is true, but wreathed in lists of things he has seen and sucked dry. Seen and sucked dry, you know: Venus de Milo, the Rhine or the Coloseum: swallowed like so many clams, and left the shells.”
—D.H. (David Herbert)
“The novel is not “a crazy quilt of bits”; it is a logical sequence of psychological events: the movements of stars may seem crazy to the simpleton, but wise men know the comets come back.”
—Vladimir Nabokov (1899–1977)