Editing Triangulum (section)

==Characteristics==
A small constellation, Triangulum is bordered by Andromeda to the north and west, [[Pisces (constellation)|Pisces]] to the west and south, [[Aries (constellation)|Aries]] to the south, and [[Perseus (constellation)|Perseus]] to the east. The centre of the constellation lies halfway between Gamma Andromedae and [[Alpha Arietis]].<ref>{{cite book|last=Simpson|first=L. Phil|title=Guidebook to the Constellations: Telescopic Sights, Tales, and Myths|publisher=Springer|location=New York, New York|date=2012|page=417|isbn=978-1-4419-6941-5|url=https://books.google.com/books?id=7gde2t9ta4QC&q=delta+triangulum&pg=PA417}}</ref> The three-letter abbreviation for the constellation, as adopted by the IAU in 1922, is "Tri".<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 | pages=469–71 | 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 as a polygon of 14 segments. In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|01|31.3}} and {{RA|02|50.4}}, while the [[declination]] coordinates are between 25.60° and 37.35°.<ref name=boundary>{{Cite web | title=Triangulum, Constellation Boundary | work=The Constellations | publisher=International Astronomical Union | url=https://www.iau.org/public/themes/constellations/#tri | access-date=24 May 2013}}</ref>  Covering 132 square degrees and 0.320% of the night sky, Triangulum ranks 78th of the 88 constellations in size.<ref name=bagnall>{{cite book |last=Bagnall |first=Philip M. |title=The Star Atlas Companion: What You Need to Know about the Constellations |publisher=Springer  |location=New York, New York |date=2012 |isbn=978-1-4614-0830-7 |page=436 |url=https://books.google.com/books?id=KcIg02TKW6QC&pg=PA436}}</ref>