The Sixteenth Data Release of the Sloan Digital Sky Surveys : first release from the APOGEE-2 Southern Survey and full release of eBOSS spectra
Abstract
This paper documents the sixteenth data release (DR16) from the Sloan Digital Sky Surveys; the fourth and penultimate from the fourth phase (SDSS-IV). This will be the first release of data from the Southern Hemisphere Survey of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new data from APOGEE-2 North are also included.DR16 is also notable as the final data release to contain data (spectra) from the main cosmological program of the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), and all raw and reduced spectra from that project are released here. DR16 also includes the last data from the Time Domain Spectroscopic Survey (TDSS) and new data from the SPectroscopic IDentification of ERosita Survey (SPIDERS) programs, both of which co-observed on eBOSS plates. DR16 has no new data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey (or the MaNGA Stellar Library "MaStar"). We also preview future SDSS-V operations (due to start in 2020), and summarize plans for the final SDSS-IV data release (DR17).
Citation
Ahumada , R , Prieto , C A , Almeida , A , Anders , F , Anderson , S F , Andrews , B H , Anguiano , B , Arcodia , R , Armengaud , E , Aubert , M , Avila , S , Avila-Reese , V , Badenes , C , Balland , C , Barger , K , Barrera-Ballesteros , J K , Basu , S , Bautista , J , Beaton , R L , Beers , T C , Benavides , B I T , Bender , C F , Bernardi , M , Bershady , M , Beutler , F , Bidin , C M , Bird , J , Bizyaev , D , Blanc , G A , Blanton , M R , Boquien , M , Borissova , J , Bovy , J , Brandt , W N , Brinkmann , J , Brownstein , J R , Bundy , K , Bureau , M , Burgasser , A , Burtin , E , Cano-Díaz , M , Capasso , R , Cappellari , M , Carrera , R , Chabanier , S , Chaplin , W , Chapman , M , Cherinka , B , Chiappini , C , Doohyun Choi , P , Chojnowski , S D , Chung , H , Clerc , N , Coffey , D , Comerford , J M , Comparat , J , Da Costa , L , Cousinou , M-C , Covey , K , Crane , J D , Cunha , K , Da Silva Ilha , G , Dai , Y S , Damsted , S B , Darling , J , Davidson , J W , Davies , R , Dawson , K , De , N , De La Macorra , A , De Lee , N , Queiroz , A B D A , Deconto Machado , A , De La Torre , S , Dell’Agli , F , Du Mas Des Bourboux , H , Diamond-Stanic , A M , Dillon , S , Donor , J , Drory , N , Duckworth , C , Dwelly , T , Ebelke , G , Eftekharzadeh , S , Davis Eigenbrot , A , Elsworth , Y P , Eracleous , M , Erfanianfar , G , Escoffier , S , Fan , X , Farr , E , Fernández-Trincado , J G , Feuillet , D , Finoguenov , A , Fofie , P , Fraser-Mckelvie , A , Frinchaboy , P M , Fromenteau , S , Fu , H , Galbany , L , Garcia , R A , García-Hernández , D A , Oehmichen , L A G , Ge , J , Maia , M A G , Geisler , D , Gelfand , J , Goddy , J , Gonzalez-Perez , V , Grabowski , K , Green , P , Grier , C J , Guo , H , Guy , J , Harding , P , Hasselquist , S , Hawken , A J , Hayes , C R , Hearty , F , Hekker , S , Hogg , D W , Holtzman , J A , Horta , D , Hou , J , Hsieh , B-C , Huber , D , Hunt , J A S , Chitham , J I , Imig , J , Jaber , M , Angel , C E J , Johnson , J A , Jones , A M , Jönsson , H , Jullo , E , Kim , Y , Kinemuchi , K , Kirkpatrick Iv , C C , Kite , G W , Klaene , M , Kneib , J-P , Kollmeier , J A , Kong , H , Kounkel , M , Krishnarao , D , Lacerna , I , Lan , T-W , Lane , R R , Law , D R , Le Goff , J-M , Leung , H W , Lewis , H , Li , C , Lian , J , Lin , L , Long , D , Longa-Peña , P , Lundgren , B , Lyke , B W , Ted Mackereth , J , Macleod , C L , Majewski , S R , Manchado , A , Maraston , C , Martini , P , Masseron , T , Masters , K L , Mathur , S , Mcdermid , R M , Merloni , A , Merrifield , M , Mészáros , S , Miglio , A , Minniti , D , Minsley , R , Miyaji , T , Mohammad , F G , Mosser , B , Mueller , E , Muna , D , Muñoz-Gutiérrez , A , Myers , A D , Nadathur , S , Nair , P , Nandra , K , Do Nascimento , J C , Nevin , R J , Newman , J A , Nidever , D L , Nitschelm , C , Noterdaeme , P , O’Connell , J E , Olmstead , M D , Oravetz , D , Oravetz , A , Osorio , Y , Pace , Z J , Padilla , N , Palanque-Delabrouille , N , Palicio , P A , Pan , H , Pan , K , Parker , J , Paviot , R , Peirani , S , Ramŕez , K P , Penny , S , Percival , W J , Perez-Fournon , I , Pérez-Ràfols , I , Petitjean , P , Pieri , M M , Pinsonneault , M , Poovelil , V J , Povick , J T , Prakash , A , Price-Whelan , A M , Raddick , M J , Raichoor , A , Ray , A , Rembold , S B , Rezaie , M , Riffel , R A , Riffel , R , Rix , H-W , Robin , A C , Roman-lopes , A , Román-zúñiga , C , Rose , B , Ross , A J , Rossi , G , Rowlands , K , Rubin , K H R , Salvato , M , Sánchez , A G , Sánchez-Menguiano , L , Sánchez-Gallego , J R , Sayres , C , Schaefer , A , Schiavon , R P , Schimoia , J S , Schlafly , E , Schlegel , D , Schneider , D P , Schultheis , M , Schwope , A , Seo , H-J , Serenelli , A , Shafieloo , A , Shamsi , S J , Shao , Z , Shen , S , Shetrone , M , Shirley , R , Aguirre , V S , Simon , J D , Skrutskie , M F , Slosar , A , Smethurst , R , Sobeck , J , Sodi , B C , Souto , D , Stark , D V , Stassun , K G , Steinmetz , M , Stello , D , Stermer , J , Storchi-Bergmann , T , Streblyanska , A , Stringfellow , G S , Stutz , A , Suárez , G , Sun , J , Taghizadeh-Popp , M , Talbot , M S , Tayar , J , Thakar , A R , Theriault , R , Thomas , D , Thomas , Z C , Tinker , J , Tojeiro , R , Toledo , H H , Tremonti , C A , Troup , N W , Tuttle , S , Unda-Sanzana , E , Valentini , M , Vargas-gonzález , J , Vargas-magaña , M , Vázquez-Mata , J A , Vivek , M , Wake , D , Wang , Y , Weaver , B A , Weijmans , A-M , Wild , V , Wilson , J C , Wilson , R F , Wolthuis , N , Wood-Vasey , W M , Yan , R , Yang , M , Yèche , C , Zamora , O , Zarrouk , P , Zasowski , G , Zhang , K , Zhao , C , Zhao , G , Zheng , Z , Zheng , Z , Zhu , G & Zou , H 2020 , ' The Sixteenth Data Release of the Sloan Digital Sky Surveys : first release from the APOGEE-2 Southern Survey and full release of eBOSS spectra ' , Astrophysical Journal Supplement Series , vol. 249 , no. 1 , 3 . https://doi.org/10.3847/1538-4365/ab929e
Publication
Astrophysical Journal Supplement Series
Status
Peer reviewed
ISSN
0067-0049Type
Journal article
Description
Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions.Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
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Brain imaging ... -
The 13th data release of the Sloan Digital Sky Survey : first spectroscopic data from the SDSS-IV Survey MApping Nearby Galaxies at Apache Point Observatory
Albareti, Franco D.; Prieto, Carlos Allende; Almeida, Andres; Anders, Friedrich; Anderson, Scott; Andrews, Brett H.; Aragón-Salamanca, Alfonso; Argudo-Fernández, Maria; Armengaud, Eric; Aubourg, Eric; Avila-Reese, Vladimir; Badenes, Carles; Bailey, Stephen; Barbuy, Beatriz; Barger, Kat; Barrera-Ballesteros, Jorge; Bartosz, Curtis; Basu, Sarbani; Bates, Dominic; Battaglia, Giuseppina; Baumgarten, Falk; Baur, Julien; Bautista, Julian; Beers, Timothy C.; Belfiore, Francesco; Bershady, Matthew; Lis, Sara Bertran de; Bird, Jonathan C.; Bizyaev, Dmitry; Blanc, Guillermo A.; Blanton, Michael; Blomqvist, Michael; Bolton, Adam S.; Borissova, J.; Bovy, Jo; Brandt, William Nielsen; Brinkmann, Jonathan; Brownstein, Joel R.; Bundy, Kevin; Burtin, Etienne; Busca, Nicolás G.; Chavez, Hugo Orlando Camacho; Díaz, M. Cano; Cappellari, Michele; Carrera, Ricardo; Chen, Yanping; Cherinka, Brian; Cheung, Edmond; Chiappini, Cristina; Chojnowski, Drew; Chuang, Chia-Hsun; Chung, Haeun; Cirolini, Rafael Fernando; Clerc, Nicolas; Cohen, Roger E.; Comerford, Julia M.; Comparat, Johan; Nascimento, Janaina Correa do; Cousinou, Marie-Claude; Covey, Kevin; Crane, Jeffrey D.; Croft, Rupert; Cunha, Katia; Darling, Jeremy; Jr., James W. Davidson; Dawson, Kyle; Costa, Luiz Da; Ilha, Gabriele Da Silva; Machado, Alice Deconto; Delubac, Timothée; Lee, Nathan De; Macorra, Axel De la; Torre, Sylvain De la; Diamond-Stanic, Aleksandar M.; Donor, John; Downes, Juan Jose; Drory, Niv; Du, Cheng; Bourboux, Hélion Du Mas des; Dwelly, Tom; Ebelke, Garrett; Eigenbrot, Arthur; Eisenstein, Daniel J.; Elsworth, Yvonne P.; Emsellem, Eric; Eracleous, Michael; Escoffier, Stephanie; Evans, Michael L.; Falcón-Barroso, Jesús; Fan, Xiaohui; Favole, Ginevra; Fernandez-Alvar, Emma; Fernandez-Trincado, J. G.; Feuillet, Diane; Fleming, Scott W.; Font-Ribera, Andreu; Freischlad, Gordon; Frinchaboy, Peter; Fu, Hai; Gao, Yang; Garcia, Rafael A.; Garcia-Dias, R.; Garcia-Hernández, D. A.; Pérez, Ana E. Garcia; Gaulme, Patrick; Ge, Junqiang; Geisler, Douglas; Gillespie, Bruce; Marin, Hector Gil; Girardi, Léo; Goddard, Daniel; Chew, Yilen Gomez Maqueo; Gonzalez-Perez, Violeta; Grabowski, Kathleen; Green, Paul; Grier, Catherine J.; Grier, Thomas; Guo, Hong; Guy, Julien; Hagen, Alex; Hall, Matt; Harding, Paul; Harley, R. E.; Hasselquist, Sten; Hawley, Suzanne; Hayes, Christian R.; Hearty, Fred; Hekker, Saskia; Toledo, Hector Hernandez; Ho, Shirley; Hogg, David W.; Holley-Bockelmann, Kelly; Holtzman, Jon A.; Holzer, Parker H.; Hu, Jian; Huber, Daniel; Hutchinson, Timothy Alan; Hwang, Ho Seong; Ibarra-Medel, Héctor J.; Ivans, Inese I.; Ivory, KeShawn; Jaehnig, Kurt; Jensen, Trey W.; Johnson, Jennifer A.; Jones, Amy; Jullo, Eric; Kallinger, T.; Kinemuchi, Karen; Kirkby, David; Klaene, Mark; Kneib, Jean-Paul; Kollmeier, Juna A.; Lacerna, Ivan; Lane, Richard R.; Lang, Dustin; Laurent, Pierre; Law, David R.; Leauthaud, Alexie; Goff, Jean-Marc Le; Li, Chen; Li, Cheng; Li, Niu; Li, Ran; Liang, Fu-Heng; Liang, Yu; Lima, Marcos; Lin, Lihwai; Lin, Lin; Lin, Yen-Ting; Liu, Chao; Long, Dan; Lucatello, Sara; MacDonald, Nicholas; MacLeod, Chelsea L.; Mackereth, J. Ted; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Maiolino, Roberto; Majewski, Steven R.; Malanushenko, Olena; Malanushenko, Viktor; Mallmann, Nícolas Dullius; Manchado, Arturo; Maraston, Claudia; Marques-Chaves, Rui; Valpuesta, Inma Martinez; Masters, Karen L.; Mathur, Savita; McGreer, Ian D.; Merloni, Andrea; Merrifield, Michael R.; Meszáros, Szabolcs; Meza, Andres; Miglio, Andrea; Minchev, Ivan; Molaverdikhani, Karan; Montero-Dorta, Antonio D.; Mosser, Benoit; Muna, Demitri; Myers, Adam; Nair, Preethi; Nandra, Kirpal; Ness, Melissa; Newman, Jeffrey A.; Nichol, Robert C.; Nidever, David L.; Nitschelm, Christian; O’Connell, Julia; Oravetz, Audrey; Oravetz, Daniel J.; Pace, Zachary; Padilla, Nelson; Palanque-Delabrouille, Nathalie; Pan, Kaike; Parejko, John; Paris, Isabelle; Park, Changbom; Peacock, John A.; Peirani, Sebastien; Pellejero-Ibanez, Marcos; Penny, Samantha; Percival, Will J.; Percival, Jeffrey W.; Perez-Fournon, Ismael; Petitjean, Patrick; Pieri, Matthew; Pinsonneault, Marc H.; Pisani, Alice; Prada, Francisco; Prakash, Abhishek; Price-Jones, Natalie; Raddick, M. Jordan; Rahman, Mubdi; Raichoor, Anand; Rembold, Sandro Barboza; Reyna, A. M.; Rich, James; Richstein, Hannah; Ridl, Jethro; Riffel, Rogemar A.; Riffel, Rogério; Rix, Hans-Walter; Robin, Annie C.; Rockosi, Constance M.; Rodríguez-Torres, Sergio; Rodrigues, Thaíse S.; Roe, Natalie; Lopes, A. Roman; Román-Zúñiga, Carlos; Ross, Ashley J.; Rossi, Graziano; Ruan, John; Ruggeri, Rossana; Runnoe, Jessie C.; Salazar-Albornoz, Salvador; Salvato, Mara; Sanchez, Sebastian F.; Sanchez, Ariel G.; Sanchez-Gallego, José R.; Santiago, Basílio Xavier; Schiavon, Ricardo; Schimoia, Jaderson S.; Schlafly, Eddie; Schlegel, David J.; Schneider, Donald P.; Schönrich, Ralph; Schultheis, Mathias; Schwope, Axel; Seo, Hee-Jong; Serenelli, Aldo; Sesar, Branimir; Shao, Zhengyi; Shetrone, Matthew; Shull, Michael; Aguirre, Victor Silva; Skrutskie, M. F.; Slosar, Anže; Smith, Michael; Smith, Verne V.; Sobeck, Jennifer; Somers, Garrett; Souto, Diogo; Stark, David V.; Stassun, Keivan G.; Steinmetz, Matthias; Stello, Dennis; Bergmann, Thaisa Storchi; Strauss, Michael A.; Streblyanska, Alina; Stringfellow, Guy S.; Suarez, Genaro; Sun, Jing; Taghizadeh-Popp, Manuchehr; Tang, Baitian; Tao, Charling; Tayar, Jamie; Tembe, Mita; Thomas, Daniel; Tinker, Jeremy; Tojeiro, Rita; Tremonti, Christy; Troup, Nicholas; Trump, Jonathan R.; Unda-Sanzana, Eduardo; Valenzuela, O.; Bosch, Remco Van den; Vargas-Magaña, Mariana; Vazquez, Jose Alberto; Villanova, Sandro; Vivek, M.; Vogt, Nicole; Wake, David; Walterbos, Rene; Wang, Yuting; Wang, Enci; Weaver, Benjamin Alan; Weijmans, Anne-Marie; Weinberg, David H.; Westfall, Kyle B.; Whelan, David G.; Wilcots, Eric; Wild, Vivienne; Williams, Rob A.; Wilson, John; Wood-Vasey, W. M.; Wylezalek, Dominika; Xiao, Ting; Yan, Renbin; Yang, Meng; Ybarra, Jason E.; Yeche, Christophe; Yuan, Fang-Ting; Zakamska, Nadia; Zamora, Olga; Zasowski, Gail; Zhang, Kai; Zhao, Cheng; Zhao, Gong-Bo; Zheng, Zheng; Zheng, Zheng; Zhou, Zhi-Min; Zhu, Guangtun; Zinn, Joel C.; Zou, Hu (2017-12) - Journal articleThe fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in July 2014. It pursues three core programs: APOGEE-2,MaNGA, and eBOSS. In addition, eBOSS contains two major subprograms: TDSS and SPIDERS. ... -
Sloan Digital Sky Survey IV : mapping the Milky Way, nearby galaxies and the distant universe
Blanton, Michael R.; Bershady, Matthew A.; Abolfathi, Bela; Albareti, Franco D.; Prieto, Carlos Allende; Almeida, Andres; Alonso-García, Javier; Anders, Friedrich; Anderson, Scott F.; Andrews, Brett; Aquino-Ortíz, Erik; Aragón-Salamanca, Alfonso; Argudo-Fernández, Maria; Armengaud, Eric; Aubourg, Eric; Avila-Reese, Vladimir; Badenes, Carles; Bailey, Stephen; Barger, Kathleen A.; Barrera-Ballesteros, Jorge; Bartosz, Curtis; Bates, Dominic; Baumgarten, Falk; Bautista, Julian; Beaton, Rachael; Beers, Timothy C.; Belfiore, Francesco; Bender, Chad F.; Berlind, Andreas A.; Bernardi, Mariangela; Beutler, Florian; Bird, Jonathan C.; Bizyaev, Dmitry; Blanc, Guillermo A.; Blomqvist, Michael; Bolton, Adam S.; Boquien, Médéric; Borissova, Jura; Bosch, Remco van den; Bovy, Jo; Brandt, William N.; Brinkmann, Jonathan; Brownstein, Joel R.; Bundy, Kevin; Burgasser, Adam J.; Burtin, Etienne; Busca, Nicolás G.; Cappellari, Michele; Carigi, Maria Leticia Delgado; Carlberg, Joleen K.; Rosell, Aurelio Carnero; Carrera, Ricardo; Chanover, Nancy J.; Cherinka, Brian; Cheung, Edmond; Chew, Yilen Gómez Maqueo; Chiappini, Cristina; Choi, Peter Doohyun; Chojnowski, Drew; Chuang, Chia-Hsun; Chung, Haeun; Cirolini, Rafael Fernando; Clerc, Nicolas; Cohen, Roger E.; Comparat, Johan; Costa, Luiz da; Cousinou, Marie-Claude; Covey, Kevin; Crane, Jeffrey D.; Croft, Rupert A. C.; Cruz-Gonzalez, Irene; Cuadra, Daniel Garrido; Cunha, Katia; Damke, Guillermo J.; Darling, Jeremy; Davies, Roger; Dawson, Kyle; Macorra, Axel de la; Dell’Agli, Flavia; Lee, Nathan De; Delubac, Timothée; Mille, Francesco Di; Diamond-Stanic, Aleks; Cano-Díaz, Mariana; Donor, John; Downes, Juan José; Drory, Niv; Bourboux, Hélion du Mas des; Duckworth, Christopher J.; Dwelly, Tom; Dyer, Jamie; Ebelke, Garrett; Eigenbrot, Arthur D.; Eisenstein, Daniel J.; Emsellem, Eric; Eracleous, Mike; Escoffier, Stephanie; Evans, Michael L.; Fan, Xiaohui; Fernández-Alvar, Emma; Fernandez-Trincado, J. G.; Feuillet, Diane K.; Finoguenov, Alexis; Fleming, Scott W.; Font-Ribera, Andreu; Fredrickson, Alexander; Freischlad, Gordon; Frinchaboy, Peter M.; Fuentes, Carla E.; Galbany, Lluís; Garcia-Dias, R.; García-Hernández, D. A.; Gaulme, Patrick; Geisler, Doug; Gelfand, Joseph D.; Gil-Marín, Héctor; Gillespie, Bruce A.; Goddard, Daniel; Gonzalez-Perez, Violeta; Grabowski, Kathleen; Green, Paul J.; Grier, Catherine J.; Gunn, James E.; Guo, Hong; Guy, Julien; Hagen, Alex; Hahn, ChangHoon; Hall, Matthew; Harding, Paul; Hasselquist, Sten; Hawley, Suzanne L.; Hearty, Fred; Hernández, Jonay I. Gonzalez; Ho, Shirley; Hogg, David W.; Holley-Bockelmann, Kelly; Holtzman, Jon A.; Holzer, Parker H.; Huehnerhoff, Joseph; Hutchinson, Timothy A.; Hwang, Ho Seong; Ibarra-Medel, Héctor J.; Ilha, Gabriele da Silva; Ivans, Inese I.; Ivory, KeShawn; Jackson, Kelly; Jensen, Trey W.; Johnson, Jennifer A.; Jones, Amy; Jönsson, Henrik; Jullo, Eric; Kamble, Vikrant; Kinemuchi, Karen; Kirkby, David; Kitaura, Francisco-Shu; Klaene, Mark; Knapp, Gillian R.; Kneib, Jean-Paul; Kollmeier, Juna A.; Lacerna, Ivan; Lane, Richard R.; Lang, Dustin; Law, David R.; Lazarz, Daniel; Lee, Youngbae; Goff, Jean-Marc Le; Liang, Fu-Heng; Li, Cheng; Li, Hongyu; Lian, Jianhui; Lima, Marcos; Lin, Lihwai; Lin, Yen-Ting; Lis, Sara Bertran de; Liu, Chao; Lizaola, Miguel Angel C. de Icaza; Long, Dan; Lucatello, Sara; Lundgren, Britt; MacDonald, Nicholas K.; Machado, Alice Deconto; MacLeod, Chelsea L.; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Maiolino, Roberto; Majewski, Steven R.; Malanushenko, Elena; Malanushenko, Viktor; Manchado, Arturo; Mao, Shude; Maraston, Claudia; Marques-Chaves, Rui; Masseron, Thomas; Masters, Karen L.; McBride, Cameron K.; McDermid, Richard M.; McGrath, Brianne; McGreer, Ian D.; Peña, Nicolás Medina; Melendez, Matthew; Merloni, Andrea; Merrifield, Michael R.; Meszaros, Szabolcs; Meza, Andres; Minchev, Ivan; Minniti, Dante; Miyaji, Takamitsu; More, Surhud; Mulchaey, John; Müller-Sánchez, Francisco; Muna, Demitri; Munoz, Ricardo R.; Myers, Adam D.; Nair, Preethi; Nandra, Kirpal; Nascimento, Janaina Correa do; Negrete, Alenka; Ness, Melissa; Newman, Jeffrey A.; Nichol, Robert C.; Nidever, David L.; Nitschelm, Christian; Ntelis, Pierros; O’Connell, Julia E.; Oelkers, Ryan J.; Oravetz, Audrey; Oravetz, Daniel; Pace, Zach; Padilla, Nelson; Palanque-Delabrouille, Nathalie; Palicio, Pedro Alonso; Pan, Kaike; Parejko, John K.; Parikh, Taniya; Pâris, Isabelle; Park, Changbom; Patten, Alim Y.; Peirani, Sebastien; Pellejero-Ibanez, Marcos; Penny, Samantha; Percival, Will J.; Perez-Fournon, Ismael; Petitjean, Patrick; Pieri, Matthew M.; Pinsonneault, Marc; Pisani, Alice; Poleski, Radosław; Prada, Francisco; Prakash, Abhishek; Queiroz, Anna Bárbara de Andrade; Raddick, M. Jordan; Raichoor, Anand; Rembold, Sandro Barboza; Richstein, Hannah; Riffel, Rogemar A.; Riffel, Rogério; Rix, Hans-Walter; Robin, Annie C.; Rockosi, Constance M.; Rodríguez-Torres, Sergio; Roman-Lopes, A.; Román-Zúñiga, Carlos; Rosado, Margarita; Ross, Ashley J.; Rossi, Graziano; Ruan, John; Ruggeri, Rossana; Rykoff, Eli S.; Salazar-Albornoz, Salvador; Salvato, Mara; Sánchez, Ariel G.; Aguado, D. S.; Sánchez-Gallego, José R.; Santana, Felipe A.; Santiago, Basílio Xavier; Sayres, Conor; Schiavon, Ricardo P.; Schimoia, Jaderson da Silva; Schlafly, Edward F.; Schlegel, David J.; Schneider, Donald P.; Schultheis, Mathias; Schuster, William J.; Schwope, Axel; Seo, Hee-Jong; Shao, Zhengyi; Shen, Shiyin; Shetrone, Matthew; Shull, Michael; Simon, Joshua D.; Skinner, Danielle; Skrutskie, M. F.; Slosar, Anže; Smith, Verne V.; Sobeck, Jennifer S.; Sobreira, Flavia; Somers, Garrett; Souto, Diogo; Stark, David V.; Stassun, Keivan; Stauffer, Fritz; Steinmetz, Matthias; Storchi-Bergmann, Thaisa; Streblyanska, Alina; Stringfellow, Guy S.; Suárez, Genaro; Sun, Jing; Suzuki, Nao; Szigeti, Laszlo; Taghizadeh-Popp, Manuchehr; Tang, Baitian; Tao, Charling; Tayar, Jamie; Tembe, Mita; Teske, Johanna; Thakar, Aniruddha R.; Thomas, Daniel; Thompson, Benjamin A.; Tinker, Jeremy L.; Tissera, Patricia; Tojeiro, Rita; Toledo, Hector Hernandez; Torre, Sylvain de la; Tremonti, Christy; Troup, Nicholas W.; Valenzuela, Octavio; Valpuesta, Inma Martinez; Vargas-González, Jaime; Vargas-Magaña, Mariana; Vazquez, Jose Alberto; Villanova, Sandro; Vivek, M.; Vogt, Nicole; Wake, David; Walterbos, Rene; Wang, Yuting; Weaver, Benjamin Alan; Weijmans, Anne-Marie; Weinberg, David H.; Westfall, Kyle B.; Whelan, David G.; Wild, Vivienne; Wilson, John; Wood-Vasey, W. M.; Wylezalek, Dominika; Xiao, Ting; Yan, Renbin; Yang, Meng; Ybarra, Jason E.; Yèche, Christophe; Zakamska, Nadia; Zamora, Olga; Zarrouk, Pauline; Zasowski, Gail; Zhang, Kai; Zhao, Gong-Bo; Zheng, Zheng; Zheng, Zheng; Zhou, Xu; Zhou, Zhi-Min; Zhu, Guangtun B.; Zoccali, Manuela; Zou, Hu (2017-07) - Journal articleWe 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 ...