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Triangulum
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{{Short description|Constellation in the northern celestial hemisphere}} {{Other uses}} {{Featured article}} {{Infobox constellation | name = Triangulum | abbreviation = Tri | genitive = Trianguli | pronounce = {{IPAc-en|t|r|aɪ|ˈ|æ|ŋ|ɡ|j|ʊ|l|ə|m}},<br />genitive {{IPAc-en|t|r|aɪ|ˈ|æ|ŋ|ɡ|j|ʊ|l|aɪ}} | symbolism = The [[Triangle]] | RA = {{RA|01|31.3}} to {{RA|02|50.4}}<ref name=boundary/> | dec= 25.60° to 37.35°<ref name=boundary/> | family = [[Perseus Family|Perseus]] | quadrant = NQ1 | areatotal = 132 | arearank = 78th | numbermainstars = 3 | numberbfstars = 14 | numberstarsplanets = 3 | numberbrightstars = 0 | numbernearbystars = 0 | brighteststarname = [[Beta Trianguli|β Tri]] | starmagnitude = 3.00 | neareststarname = [[Delta Trianguli|δ Tri]] | stardistancely = 35.29 | stardistancepc = 10.82 | numbermessierobjects = 1 | bordering = [[Andromeda (constellation)|Andromeda]]<br />[[Pisces (constellation)|Pisces]]<br />[[Aries (constellation)|Aries]]<br />[[Perseus (constellation)|Perseus]] | latmax = [[North Pole|90]] | latmin = [[60th parallel south|60]] | month = December | notes= }} {{Contains special characters|cuneiform}} '''Triangulum''' is a small [[constellation]] in the northern sky. Its name is [[Latin]] for "[[triangle]]", derived from its three brightest stars, which form a long and narrow triangle. Known to the ancient Babylonians and Greeks, Triangulum was one of the 48 constellations listed by the 2nd century astronomer [[Ptolemy]]. The celestial cartographers [[Johann Bayer]] and [[John Flamsteed]] catalogued the constellation's stars, giving six of them [[Bayer designation]]s. The white stars [[Beta Trianguli|Beta]] and [[Gamma Trianguli]], of [[apparent magnitude]]s 3.00 and 4.00, respectively, form the base of the triangle and the yellow-white [[Alpha Trianguli]], of magnitude 3.41, the apex. [[Iota Trianguli]] is a notable double star system, and there are three [[star system]]s with known [[exoplanet|planets]] located in Triangulum. The constellation contains several galaxies, the brightest and nearest of which is the [[Triangulum Galaxy]] or Messier 33—a member of the [[Local Group]]. The first [[quasar]] ever observed, [[3C 48]], also lies within the boundaries of Triangulum.
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