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Microscopium
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==Characteristics== Microscopium is a small constellation bordered by [[Capricornus]] to the north, [[Piscis Austrinus]] and [[Grus (constellation)|Grus]] to the east, [[Sagittarius (constellation)|Sagittarius]] to the west, and [[Indus (constellation)|Indus]] to the south, touching on [[Telescopium]] to the southwest. The recommended three-letter abbreviation for the constellation, as adopted by the [[International Astronomical Union]] in 1922, is "Mic".<ref name=pa30_469>{{cite magazine | last=Russell | first=Henry Norris |author-link=Henry Norris Russell | title=The new international symbols for the constellations | magazine=[[Popular Astronomy (US magazine)|Popular Astronomy]] | volume=30 | page=469 | bibcode=1922PA.....30..469R | date=1922 }}</ref> The official constellation boundaries, as set by Belgian astronomer [[Eugène Joseph Delporte|Eugène Delporte]] in 1930, are defined by a polygon of four segments (''illustrated in infobox''). In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|20|27.3}} and {{RA|21|28.4}}, while the [[declination]] coordinates are between −27.45° and −45.09°.<ref name=boundary>{{Cite journal | title=Microscopium, constellation boundary | journal=The Constellations| url=https://www.iau.org/public/themes/constellations/#mic | access-date=13 July 2012 }}</ref> The whole constellation is visible to observers south of latitude [[45th parallel north|45°N]].<ref name=tirionconst>{{cite web| url=http://www.ianridpath.com/constellations2.html | title=Constellations: Lacerta–Vulpecula | work= Star Tales |author=Ian Ridpath|publisher=Self-published | access-date= 29 November 2014| author-link=Ian Ridpath }}</ref>{{efn|1=While parts of the constellation technically rise above the horizon to observers between 45°N and [[62nd parallel north|62°N]], stars within a few degrees of the horizon are to all intents and purposes unobservable.<ref name=tirionconst/>}} Given that its brightest stars are of fifth magnitude, the constellation is invisible to the naked eye in areas with light polluted skies.<ref>{{cite book |last=Kambič |first=Bojan |title=Viewing the Constellations with Binoculars |publisher=Springer |date=2009 |page=341 |isbn=978-0-387-85354-3 |url=https://books.google.com/books?id=3vxLNPNHOcwC&pg=PA340}}</ref>{{efn|1=Objects of magnitude 5.0 are barely visible to the unaided eye in the night skies of city-suburban transition areas.<ref name=bortle/>}}
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