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Deep-sky object
Deep-sky objects are astronomical objects other than individual stars and Solar System objects (such as Sun, Moon, planets, comets, etc.).〔(Fred Schaaf, 40 nights to knowing the sky: a night-by-night skywatching primer, page 113 )〕〔(Ian Ridpath, The illustrated encyclopedia of the universe, page 273 )〕 The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters, nebulae and galaxies.
==Origins and classification==
Classifying non-stellar astronomical objects began soon after the invention of the telescope.〔(Rocky Kolb, Blind watchers of the sky, page 174 )〕 One of the earliest comprehensive lists was Charles Messier's 1774 Messier catalog, which included 103 "''nebulae''" and other faint fuzzy objects he considered a nuisance since they could be mistaken for comets, the objects he was actually searching for.〔(Rocky Kolb, Blind watchers of the sky, page 174 )〕 As telescopes improved these faint nebulae would be broken into more descriptive scientific classifications such as interstellar clouds, star clusters, and galaxies.
"''Deep-sky object''", as an astronomical classification for these objects, has its origins in the modern field of amateur astronomy. The origin of the term is unknown but it was popularized by ''Sky & Telescope'' magazine's "Deep-Sky Wonders" column, which premiered in their first edition in 1941,〔(Sky and telescope, Volumes 1-2 )〕 created by Leland S. Copeland, written for the majority of its run by Walter Scott Houston, and currently penned by Sue French. Houston's columns, and later book compilations of those columns, helped popularize the term,〔(Fred Schaaf, 40 nights to knowing the sky: a night-by-night skywatching primer, page 13 )〕 each month giving the reader a guided tour of a small part of the sky highlighting well known and lesser known objects for binoculars and small telescopes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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