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Delphinus
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{{Short description|Constellation in the northern celestial hemisphere}} {{About|the constellation}} {{Infobox constellation | name = Delphinus | abbreviation = Del | genitive = Delphini | pronounce = {{IPAc-en|d|ɛ|l|ˈ|f|aɪ|n|ə|s}} ''Delfínus'', genitive {{IPAc-en|d|ɛ|l|ˈ|f|aɪ|n|aɪ}} | symbolism = dolphin | RA = {{RA|20|14|14.1594}} to {{RA|21|08|59.6073}}<ref name="boundary">{{Cite journal | title=Delphinus, Constellation Boundary | journal=The Constellations | publisher=International Astronomical Union | url=https://www.iau.org/public/themes/constellations/#del | access-date=15 July 2020 }}</ref> | dec= {{DEC|+2.4021468}} to {{DEC|+20.9399471}}<ref name="boundary" /> | family = [[Heavenly Waters (astronomy)|Heavenly Waters]] | quadrant = NQ4 | areatotal = 189 | arearank = 69th | numbermainstars = 5 | numberbfstars = 19 | numberstarsplanets = 6 | numberbrightstars = 0 | numbernearbystars = 2 | brighteststarname = [[Rotanev]] (β Del) | starmagnitude = 3.63 | neareststarname = [[HU Delphini|HU Del]] | stardistancely = 29.01 | stardistancepc = 8.89 | numbermessierobjects = 0 | meteorshowers = None | bordering = [[Vulpecula]]<br />[[Sagitta]]<br />[[Aquila (constellation)|Aquila]]<br />[[Aquarius (constellation)|Aquarius]]<br />[[Equuleus]]<br />[[Pegasus (constellation)|Pegasus]] | latmax = [[North Pole|90]] | latmin = [[69th parallel south|69]] | month = September | notes=}} '''Delphinus''' is a small [[constellation]] in the [[Northern Celestial Hemisphere]], close to the [[celestial equator]]. Its name is the [[Latin]] version for the [[Greek language|Greek]] word for [[dolphin]] ({{lang|el|δελφίς}}). It is one of the 48 constellations listed by the 2nd-century astronomer [[Ptolemy]], and remains one of the 88 modern constellations recognized by the [[International Astronomical Union]]. It is one of the smaller constellations, ranked 69th in size. Delphinus' five brightest stars form a distinctive [[Asterism (astronomy)|asterism]] symbolizing a dolphin with four stars representing the body and one the tail. It is bordered (clockwise from north) by [[Vulpecula]], [[Sagitta]], [[Aquila (constellation)|Aquila]], [[Aquarius (constellation)|Aquarius]], [[Equuleus]] and [[Pegasus (constellation)|Pegasus]]. Delphinus is a faint constellation with only two stars brighter than an [[apparent magnitude]] of 4, [[Beta Delphini]] (Rotanev) at magnitude 3.6 and [[Alpha Delphini]] (Sualocin) at magnitude 3.8.
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