Serpens is a constellation in the northern sky. The 88 modern constellations Andromeda Antlia Apus Aquarius Aquila Ara Aries Auriga Boötes Caelum Camelopardalis Cancer Canes Venatici Canis Major Canis Minor Capricornus Carina Cassiopeia Centaurus Cepheus Cetus Chamaeleon Circinus Columba Coma Berenices Corona Australis Corona Borealis Corvus Crater Crux Cygnus Delphinus Dorado Draco Equuleus Eridanus Fornax Gemini Grus Hercules Horologium Hydra Hydrus Indus Lacerta Leo Leo Minor Lepus Libra Lupus Lynx Lyra Mensa Microscopium Monoceros Musca Norma Octans Ophiuchus Orion Pavo Pegasus Perseus Phoenix Pictor Pisces Piscis Austrinus Puppis Pyxis Reticulum Sagitta Sagittarius Scorpius Sculptor Scutum Serpens Sextans Taurus Telescopium Triangulum Triangulum Australe Tucana Ursa Major Ursa Minor Vela Virgo Volans Vulpecula Constellation historyThe 48 constellations listed by Ptolemy after 150 ADAndromeda · Aquarius · Aquila · Ara · Argo Navis · Aries · Auriga · Boötes · Cancer · Canis Major · Canis Minor · Capricornus · Cassiopeia · Centaurus · Cepheus · Cetus · Corona Australis · Corona Borealis · Corvus · Crater · Cygnus · Delphinus · Draco · Equuleus · Eridanus · Gemini · Hercules · Hydra · Leo · Lepus · Libra · Lupus · Lyra · Ophiuchus · Orion · Pegasus · Perseus · Pisces · Piscis Austrinus · Sagitta · Sagittarius · Scorpius · Serpens · Taurus · Triangulum · Ursa Major · Ursa Minor · VirgoThe 41 additional constellations added in the 16th and 17th centuries Vespucci or Corsalius early 16c: Crux Triangulum Australe Vopel 1536: Coma Berenices Keyser & de Houtman 1596: Apus Chamaeleon Dorado Grus Hydrus Indus Musca Pavo Phoenix Tucana Volans Plancius 1613: Camelopardalis Columba Monoceros Habrecht 1621: Reticulum Hevelius 1683: Canes Venatici Lacerta Leo Minor Lynx Scutum Sextans Vulpecula de Lacaille 1763: Antlia Caelum Carina Circinus Fornax Horologium Mensa Microscopium Norma Octans Pictor Puppis Pyxis Sculptor Telescopium Vela Obsolete constellations (including Ptolemy's Argo Navis) Anser Antinous Apes Argo Navis Asterion Cancer Minor Cerberus Chara Custos Messium Felis Frederici Honores/Gloria Frederici Gallus Globus Aerostaticus Jordanus Lilium Lochium Funis Machina Electrica Malus Mons Maenalus Musca Borealis Noctua Officina Typographica Polophylax Psalterium Georgianum/Harpa Georgii Quadrans Muralis Ramus Pomifer Robur Carolinum Sceptrum Brandenburgicum Sceptrum et Manus Iustitiae Solarium Rangifer/Tarandus Taurus Poniatovii Telescopium Herschelii Testudo Tigris Triangulum Minus Turdus Solitarius Vespa Vultur cadens Vultur volans obsolete constellation names Apis Phoenicopterus Serpentarius Xiphias