Editing Corona Borealis (section)

== Characteristics ==
Covering 179 square degrees and hence 0.433% of the sky, Corona Borealis ranks 73rd of the [[IAU designated constellations]] by area.<ref name=tirionconst/> Its position in the [[Northern Celestial Hemisphere]] means that the whole [[constellation]] is visible to observers north of [[50th parallel south|50°S]].<ref name=tirionconst>{{cite web| url=http://www.ianridpath.com/constellations1.html | title=Constellations: Andromeda–Indus | work= Star Tales |author=Ridpath, Ian|publisher=self-published | access-date= 9 September 2014| author-link=Ian Ridpath }}</ref>{{efn|1=While parts of the constellation technically rise above the horizon to observers between the 50°S and [[64th parallel south|64°S]], stars within a few degrees of the horizon are to all intents and purposes unobservable.<ref name=tirionconst/>}} It is bordered by [[Boötes]] to the north and west, [[Serpens|Serpens Caput]] to the south, and [[Hercules (constellation)|Hercules]] to the east. The three-letter abbreviation for the constellation, as adopted by the [[International Astronomical Union]] in 1922, is "CrB".<ref name="pa30_469">{{cite journal | last=Russell | first=Henry Norris |author-link=Henry Norris Russell | title=The New International Symbols for the Constellations | journal=[[Popular Astronomy (US magazine)|Popular Astronomy]] | volume=30 | page=469 | bibcode=1922PA.....30..469R | year=1922 }}</ref> The official constellation boundaries, as set by Belgian astronomer [[Eugène Joseph Delporte|Eugène Delporte]] in 1930, are defined by a polygon of eight segments (''illustrated in infobox''). In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|15|16.0}} and {{RA|16|25.1}}, while the [[declination]] coordinates are between 39.71° and 25.54°.<ref name="boundary2">{{Cite journal | title=Corona Borealis, Constellation Boundary | journal=The Constellations | publisher=International Astronomical Union | url=https://www.iau.org/public/themes/constellations/#crb | access-date=12 October 2013 }}</ref> It has a counterpart—[[Corona Australis]]—in the [[Southern Celestial Hemisphere]].<ref>{{cite book|last=Cornelius|first=Geoffrey|title=Complete Guide to the Constellations: The Starwatcher's Essential Guide to the 88 Constellations, Their Myths and Symbols|publisher=Duncan Baird Publishers|location=London, United Kingdom|date=2005|pages=70–71|isbn=978-1-84483-103-6}}</ref>