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C.Rupert A. C.CroftCruz-Gonzalez, IreneIreneCruz-GonzalezGarrido Cuadra, DanielDanielGarrido CuadraCunha, KatiaKatiaCunhaDamke, Guillermo J.Guillermo J.DamkeDarling, JeremyJeremyDarlingDavies, RogerRogerDaviesDawson, KyleKyleDawsonde la Macorra, AxelAxelde la MacorraDell'Agli, FlaviaFlaviaDell'AgliDe Lee, NathanNathanDe LeeDelubac, TimothéeTimothéeDelubacDi Mille, FrancescoFrancescoDi MilleDiamond-Stanic, AleksAleksDiamond-StanicCano-Díaz, MarianaMarianaCano-DíazDonor, JohnJohnDonorDownes, Juan JoséJuan JoséDownesDrory, NivNivDrorydu Mas des Bourboux, HélionHéliondu Mas des BourbouxDuckworth, Christopher J.Christopher J.DuckworthDwelly, TomTomDwellyDyer, JamieJamieDyerEbelke, GarrettGarrettEbelkeEigenbrot, Arthur D.Arthur D.EigenbrotEisenstein, Daniel J.Daniel J.EisensteinEmsellem, EricEricEmsellemEracleous, MikeMikeEracleousEscoffier, StephanieStephanieEscoffierEvans, Michael L.Michael L.EvansFan, XiaohuiXiaohuiFanFernández-Alvar, EmmaEmmaFernández-AlvarFernandez-Trincado, J. G.J. G.Fernandez-TrincadoFeuillet, Diane K.Diane K.FeuilletFinoguenov, AlexisAlexisFinoguenovFleming, Scott W.Scott W.FlemingFont-Ribera, AndreuAndreuFont-RiberaFredrickson, AlexanderAlexanderFredricksonFreischlad, GordonGordonFreischladFrinchaboy, Peter M.Peter M.FrinchaboyFuentes, Carla E.Carla E.FuentesGalbany, LluísLluísGalbanyGarcia-Dias, R.R.Garcia-DiasGarcía-Hernández, D. A.D. A.García-HernándezGaulme, PatrickPatrickGaulmeGeisler, DougDougGeislerGelfand, Joseph D.Joseph D.GelfandGil-Marín, HéctorHéctorGil-MarínGillespie, Bruce A.Bruce A.GillespieGoddard, DanielDanielGoddardGonzalez-Perez, VioletaVioletaGonzalez-PerezGrabowski, KathleenKathleenGrabowskiGreen, Paul J.Paul J.GreenGrier, Catherine J.Catherine J.GrierGunn, James E.James E.GunnGuo, HongHongGuoGuy, JulienJulienGuyHagen, AlexAlexHagenHahn, ChangHoonChangHoonHahnHall, MatthewMatthewHallHarding, PaulPaulHardingHasselquist, StenStenHasselquistHawley, Suzanne L.Suzanne L.HawleyHearty, FredFredHeartyGonzalez Hernández, Jonay I.Jonay I.Gonzalez HernándezHo, ShirleyShirleyHoHogg, David W.David W.HoggHolley-Bockelmann, KellyKellyHolley-BockelmannHoltzman, Jon A.Jon A.HoltzmanHolzer, Parker H.Parker H.HolzerHuehnerhoff, JosephJosephHuehnerhoffHutchinson, Timothy A.Timothy A.HutchinsonHwang, Ho SeongHo SeongHwangIbarra-Medel, Héctor J.Héctor J.Ibarra-Medelda Silva Ilha, GabrieleGabrieleda Silva IlhaIvans, Inese I.Inese I.IvansIvory, KeShawnKeShawnIvoryJackson, KellyKellyJacksonJensen, Trey W.Trey W.JensenJohnson, Jennifer A.Jennifer A.JohnsonJones, AmyAmyJonesJönsson, HenrikHenrikJönssonJullo, EricEricJulloKamble, VikrantVikrantKambleKinemuchi, KarenKarenKinemuchiKirkby, DavidDavidKirkbyKitaura, Francisco-ShuFrancisco-ShuKitauraKlaene, MarkMarkKlaeneKnapp, Gillian R.Gillian R.KnappKneib, Jean-PaulJean-PaulKneibKollmeier, Juna A.Juna A.KollmeierLacerna, IvanIvanLacernaLane, Richard R.Richard R.LaneLang, DustinDustinLangLaw, David R.David R.LawLazarz, DanielDanielLazarzLee, YoungbaeYoungbaeLeeLe Goff, Jean-MarcJean-MarcLe GoffLiang, Fu-HengFu-HengLiangLi, ChengChengLiLi, HongyuHongyuLiLian, JianhuiJianhuiLianLima, MarcosMarcosLimaLin, LihwaiLihwaiLinLin, Yen-TingYen-TingLinBertran de Lis, SaraSaraBertran de LisLiu, ChaoChaoLiude Icaza Lizaola, Miguel Angel C.Miguel Angel C.de Icaza LizaolaLong, DanDanLongLUCATELLO, SaraSaraLUCATELLOLundgren, BrittBrittLundgrenMacDonald, Nicholas K.Nicholas K.MacDonaldDeconto Machado, AliceAliceDeconto MachadoMacLeod, Chelsea L.Chelsea L.MacLeodMahadevan, SuvrathSuvrathMahadevanGeimba Maia, Marcio AntonioMarcio AntonioGeimba MaiaMaiolino, RobertoRobertoMaiolinoMajewski, Steven R.Steven R.MajewskiMalanushenko, ElenaElenaMalanushenkoMalanushenko, ViktorViktorMalanushenkoManchado, ArturoArturoManchadoMao, ShudeShudeMaoMaraston, ClaudiaClaudiaMarastonMarques-Chaves, RuiRuiMarques-ChavesMasseron, ThomasThomasMasseronMasters, Karen L.Karen L.MastersMcBride, Cameron K.Cameron K.McBrideMcDermid, Richard M.Richard M.McDermidMcGrath, BrianneBrianneMcGrathMcGreer, Ian D.Ian D.McGreerMedina Peña, NicolásNicolásMedina PeñaMelendez, MatthewMatthewMelendezMerloni, AndreaAndreaMerloniMerrifield, Michael R.Michael R.MerrifieldMeszaros, SzabolcsSzabolcsMeszarosMeza, AndresAndresMezaMinchev, IvanIvanMinchevMinniti, DanteDanteMinnitiMiyaji, TakamitsuTakamitsuMiyajiMore, SurhudSurhudMoreMulchaey, JohnJohnMulchaeyMüller-Sánchez, FranciscoFranciscoMüller-SánchezMuna, DemitriDemitriMunaMunoz, Ricardo R.Ricardo R.MunozMyers, Adam D.Adam D.MyersNair, PreethiPreethiNairNandra, KirpalKirpalNandraCorrea do Nascimento, JanainaJanainaCorrea do NascimentoNegrete, AlenkaAlenkaNegreteNess, MelissaMelissaNessNewman, Jeffrey A.Jeffrey A.NewmanNichol, Robert C.Robert C.NicholNidever, David L.David L.NideverNitschelm, ChristianChristianNitschelmNtelis, PierrosPierrosNtelisO'Connell, Julia E.Julia E.O'ConnellOelkers, Ryan J.Ryan J.OelkersOravetz, AudreyAudreyOravetzOravetz, DanielDanielOravetzPace, ZachZachPacePadilla, NelsonNelsonPadillaPalanque-Delabrouille, NathalieNathaliePalanque-DelabrouilleAlonso Palicio, PedroPedroAlonso PalicioPan, KaikeKaikePanParejko, John K.John K.ParejkoParikh, TaniyaTaniyaParikhPâris, IsabelleIsabellePârisPark, ChangbomChangbomParkPatten, Alim Y.Alim Y.PattenPeirani, SebastienSebastienPeiraniPellejero-Ibanez, MarcosMarcosPellejero-IbanezPenny, SamanthaSamanthaPennyPercival, Will J.Will J.PercivalPerez-Fournon, IsmaelIsmaelPerez-FournonPetitjean, PatrickPatrickPetitjeanPieri, Matthew M.Matthew M.PieriPinsonneault, MarcMarcPinsonneaultPisani, AliceAlicePisaniPoleski, RadosławRadosławPoleskiPrada, FranciscoFranciscoPradaPrakash, AbhishekAbhishekPrakashQueiroz, Anna Bárbara de AndradeAnna Bárbara de AndradeQueirozRaddick, M. 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F.SkrutskieSlosar, AnžeAnžeSlosarSmith, Verne V.Verne V.SmithSobeck, Jennifer S.Jennifer S.SobeckSobreira, FlaviaFlaviaSobreiraSomers, GarrettGarrettSomersSouto, DiogoDiogoSoutoStark, David V.David V.StarkStassun, KeivanKeivanStassunStauffer, FritzFritzStaufferSteinmetz, MatthiasMatthiasSteinmetzStorchi-Bergmann, ThaisaThaisaStorchi-BergmannStreblyanska, AlinaAlinaStreblyanskaStringfellow, Guy S.Guy S.StringfellowSuárez, GenaroGenaroSuárezSun, JingJingSunSuzuki, NaoNaoSuzukiSzigeti, LaszloLaszloSzigetiTaghizadeh-Popp, ManuchehrManuchehrTaghizadeh-PoppTang, BaitianBaitianTangTao, CharlingCharlingTaoTayar, JamieJamieTayarTembe, MitaMitaTembeTeske, JohannaJohannaTeskeThakar, Aniruddha R.Aniruddha R.ThakarThomas, DanielDanielThomasThompson, Benjamin A.Benjamin A.ThompsonTinker, Jeremy L.Jeremy L.TinkerTissera, PatriciaPatriciaTisseraTojeiro, RitaRitaTojeiroHernandez Toledo, HectorHectorHernandez Toledode la Torre, SylvainSylvainde la TorreTremonti, ChristyChristyTremontiTroup, Nicholas W.Nicholas W.TroupValenzuela, OctavioOctavioValenzuelaMartinez Valpuesta, InmaInmaMartinez ValpuestaVargas-González, JaimeJaimeVargas-GonzálezVargas-Magaña, MarianaMarianaVargas-MagañaVazquez, Jose AlbertoJose AlbertoVazquezVillanova, SandroSandroVillanovaVivek, M.M.VivekVogt, NicoleNicoleVogtWake, DavidDavidWakeWalterbos, ReneReneWalterbosWang, YutingYutingWangWeaver, Benjamin AlanBenjamin AlanWeaverWeijmans, Anne-MarieAnne-MarieWeijmansWeinberg, David H.David H.WeinbergWestfall, Kyle B.Kyle B.WestfallWhelan, David G.David G.WhelanWild, VivienneVivienneWildWilson, JohnJohnWilsonWood-Vasey, W. M.W. M.Wood-VaseyWylezalek, DominikaDominikaWylezalekXiao, TingTingXiaoYan, RenbinRenbinYanYang, MengMengYangYbarra, Jason E.Jason E.YbarraYèche, ChristopheChristopheYècheZakamska, NadiaNadiaZakamskaZamora, OlgaOlgaZamoraZarrouk, PaulinePaulineZarroukZasowski, GailGailZasowskiZhang, KaiKaiZhangZhao, Gong-BoGong-BoZhaoZheng, ZhengZhengZhengZhou, XuXuZhouZhou, Zhi-MinZhi-MinZhouZhu, Guangtun B.Guangtun B.ZhuZoccali, ManuelaManuelaZoccaliZou, HuHuZou2021-01-272021-01-2720170004-6256http://hdl.handle.net/20.500.12386/30058We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resolution and high signal-to-noise ratios in the near-infrared. The Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey is obtaining spatially resolved spectroscopy for thousands of nearby galaxies (median z∼ 0.03). The extended Baryon Oscillation Spectroscopic Survey (eBOSS) is mapping the galaxy, quasar, and neutral gas distributions between z∼ 0.6 and 3.5 to constrain cosmology using baryon acoustic oscillations, redshift space distortions, and the shape of the power spectrum. Within eBOSS, we are conducting two major subprograms: the SPectroscopic IDentification of eROSITA Sources (SPIDERS), investigating X-ray AGNs and galaxies in X-ray clusters, and the Time Domain Spectroscopic Survey (TDSS), obtaining spectra of variable sources. All programs use the 2.5 m Sloan Foundation Telescope at the Apache Point Observatory; observations there began in Summer 2014. APOGEE-2 also operates a second near-infrared spectrograph at the 2.5 m du Pont Telescope at Las Campanas Observatory, with observations beginning in early 2017. Observations at both facilities are scheduled to continue through 2020. In keeping with previous SDSS policy, SDSS-IV provides regularly scheduled public data releases; the first one, Data Release 13, was made available in 2016 July.STAMPAenArticle10.3847/1538-3881/aa75672-s2.0-85024504231000404755500001https://iopscience.iop.org/article/10.3847/1538-3881/aa75672017AJ....154...28BFIS/05 - ASTRONOMIA E ASTROFISICA