The Cosmic Web
The Sloan Digital Sky Survey: Mapping the Universe

The Sloan Digital Sky Survey has created the most detailed three-dimensional maps of the Universe ever made, with deep multi-color images of one third of the sky, and spectra for more than three million astronomical objects. Learn and explore all phases and surveys—past, present, and future—of the SDSS.


EXPLORE OUR DATA

Go to Data Access

Current data: Data Release 16

Future Data Releases

The final Data Release of SDSS-IV is scheduled for July 2021, and will include all APOGEE-2, eBOSS and MaNGA spectra observed during SDSS-IV, as well as all final data products and catalogs.

In addition to the final eBOSS clustering samples, DR17 will include new single-fiber, optical spectra associated with a completed reverberation mapping program and a pilot program of X-ray counterparts.

Future Plans

SDSS-V will start observations in summer 2020, with its first data release expected two years later. Surveys in SDSS-V include Milky Way Mapper, Local Volume Mapper and Black Hole Mapper. Read more about these surveys on the Future Page.


The SDSS began regular survey operations in 2000, after a decade of design and construction.  It has progressed through several phases, SDSS-I (2000-2005), SDSS-II (2005-2008), SDSS-III (2008-2014), and SDSS-IV (2014-2020).  Each of these phases has involved multiple surveys with interlocking science goals.  The three surveys that comprise SDSS-IV are eBOSS (including SPIDERS and TDSS), APOGEE-2, and MaNGA (including MaStar), described at the links below.  You can find more about the surveys of SDSS I-III by following the Prior Surveys link. SDSS-V (2020 – ) will be the next SDSS phase, and more information on its surveys is available through the Future Pages.

APOGEE-2

Exploring the Milky Way from both hemispheres

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eBOSS

Surveying galaxies and quasars to measure the Universe

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MaNGA

Mapping the inner workings of thousands of nearby galaxies

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Prior Surveys

Discovering the Universe at all scales

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Acknowledgments

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. SDSS acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS web site is www.sdss.org.

SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU) / University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatório Nacional / MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University.