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 comets whose orbit has not been determined are designated with a x prefix lists. Halleys comet is the most famous of all comets british astronomer edmund halley was the first to realise that comets are periodic after observing it in 1682 and tallying it to records of two . The following is a collection of lists of exceptional asteroids in the solar systemfor the purposes of this article asteroid means minor planet up to the orbit of jupiter which includes the dwarf planet ceresfor a complete list of minor planets in numerical order see list of minor planets asteroids are given minor planet numbers but not all minor planets are asteroids. A newly discovered comet is assigned a name by the international astronomical union for example comet ison was named c 2012 s1 after its discovery on september 24 2012 our list of non perioidc comets is sortable by name discovery date and next perihelion
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