Editing Lewis A. Swift (section)

==Discoveries==
Swift discovered or co-discovered a number of [[comet]]s, including periodic comets [[11P/Tempel-Swift-LINEAR]], [[64P/Swift-Gehrels]], and [[109P/Swift-Tuttle]] (parent body of the [[Perseids]] meteor shower). He also discovered comets [[C/1877 G2]], [[C/1878 N1]], [[C/1879 M1]], [[C/1881 J1]], [[C/1881 W1]], [[C/1892 E1]], [[D/1895 Q1]] (also known as D/Swift, whose debris stream [[Mariner 4]] probably encountered on September 15, 1967<ref>[https://science.nasa.gov/headlines/y2006/23aug_mariner4.htm NASA - Meteor Mystery, Solved?<!-- bot-generated title -->] {{webarchive|url=https://web.archive.org/web/20090406234926/http://science.nasa.gov/headlines/y2006/23aug_mariner4.htm |date=2009-04-06 }} at science.nasa.gov</ref>), [[C/1896 G1]] and [[C/1899 E1]], and co-discovered [[C/1883 D1]] (Brooks-Swift). Note, however, comet [[54P/de Vico-Swift-NEAT]] was discovered by his son [[Edward D. Swift]] rather than by him.

He discovered his last comet at the age of 79. He was one of the few people to see [[Comet Halley]] at two of its appearances, 76 years apart (see also: External Link).

In 1878 he believed he had observed two [[Vulcan (planet)|Vulcan]]-type [[planet]]s (planets within the orbit of [[Mercury (planet)|Mercury]]), but he was mistaken.

Apart from comets, he also discovered hundreds of [[nebulae]], such as [[IC 289]], and galaxies, such as [[NGC 6]], [[NGC 19]] and [[NGC 27]]. He independently observed [[NGC 17]], leading to its separate listing in the New General Catalogue as NGC 34.