Editing Telescopium (section)

==History==
[[File:Sidney Hall - Urania's Mirror - Sagittarius and Corona Australis, Microscopium, and Telescopium.png|left|thumb|upright=1.15|Seen in the 1824 star chart set ''[[Urania's Mirror]]'' (in the lower right)]]
Telescopium was introduced in 1751–52 by [[Nicolas-Louis de Lacaille]] with the French name ''le Telescope'',{{sfn|Ridpath, ''Star Tales'' Lacaille}} depicting an [[aerial telescope]],{{sfn|Wagman|2003|p=299}} after he had observed and catalogued 10,000 southern stars during a two-year stay at the [[Cape of Good Hope]]. He devised 14 new constellations in uncharted regions of the [[Southern Celestial Hemisphere]] not visible from Europe. All but one honored instruments that symbolised the [[Age of Enlightenment]].{{sfn|Wagman|2003|pp=6–7}} Covering 40 degrees of the night sky,{{sfn|Wagman|2003|p=299}} the telescope stretched out northwards between Sagittarius and Scorpius.{{sfn|Ridpath, ''Star Tales'' Telescopium}} Lacaille had Latinised its name to ''Telescopium'' by 1763.{{sfn|Ridpath, ''Star Tales'' Lacaille}}

The constellation was known by other names. It was called ''Tubus Astronomicus'' in the eighteenth century, during which time three constellations depicting telescopes were recognised—[[Telescopium Herschelii|Tubus Herschelii Major]] between Gemini and Auriga and [[Tubus Herschelii Minor]] between Taurus and Orion, both of which had fallen out of use by the nineteenth century.{{sfn|Ellis|1997}} [[Johann Elert Bode|Johann Bode]] called it the ''Astronomische Fernrohr'' in his 1805 ''Gestirne'' and kept its size, but later astronomers [[Francis Baily]] and [[Benjamin Apthorp Gould|Benjamin Gould]] subsequently shrank its boundaries.{{sfn|Allen|1963|p=414}} The much-reduced constellation lost several brighter stars to neighbouring constellations: Beta Telescopii became [[Eta Sagittarii]], which it had been before Lacaille placed it in Telescopium,{{sfn|Wagman|2003|p=300}} Gamma was placed in Scorpius and renamed [[G Scorpii]] by Gould,{{sfn|Wagman|2003|p=300}} Theta Telescopii reverted to its old appellation of [[45 Ophiuchi|d Ophiuchi]],{{sfn|Wagman|2003|p=300}} and Sigma Telescopii was placed in Corona Australis. Initially uncatalogued, the latter is now known as [[HR 6875]].{{sfn|Wagman|2003|p=300}} The original object Lacaille had named Eta Telescopii—the open cluster [[Messier 7]]—was in what is now Scorpius, and Gould used the Bayer designation for a magnitude 5 star, which he felt warranted a letter.{{sfn|Wagman|2003|p=300}}