DR16 Highlights

The SDSS telescope at night
The SDSS telescope at night
Image Credit: Patrick Gaulme

Data Release 16 (DR16) is the fourth data release of the fourth phase of the Sloan Digital Sky Survey (SDSS-IV). DR16 contains SDSS observations through August 2018.

DR16 includes the following:

  • The latest and final data release of optical spectra from the SDSS component extended Baryon Oscillation Spectroscopic Survey (eBOSS), including the spectra of the SPectroscopic IDentfication of ERosita Sources (SPIDERS) survey and Time Domain Spectroscopic Survey (TDSS).
  • The latest infrared spectra of the SDSS component Apache Point Observatory Galaxy Evolution Experiment 2 (APOGEE-2), including the first public release of spectra taken at Las Campanas Observatory (APOGEE-2 South) as well as newly improved data tutorials
  • The most current data cubes from integral field unit (IFU) spectroscopic observations of nearby galaxies from the SDSS component Mapping Nearby Galaxies at APO (MaNGA), as well as the first data products and maps from the MaNGA Data Analysis Pipeline (DAP)
  • The most current optical stellar spectra of the MaNGA Stellar Library program (MaStar)
  • Marvin: a new tool to visualise and analyse MaNGA datacubes and maps
  • Value Added Catalogs (VACs) for all three SDSS components (eBOSS, APOGEE-2 and MaNGA), including targeting catalogs
  • The most current reprocessed imaging and spectra from the SDSS legacy survey

DR16 directly follows DR15. As always, SDSS data releases are cumulative, so DR16 includes all the sky coverage of prior releases. Data Release 12, Data Release 13, Data Release 14, and Data Relase 15 are still available on this website, and prior data releases are available from www.sdss3.org (for DR8 through DR10) or classic.sdss.org (for DR1 through DR7).

Working with SDSS Data

If you use public SDSS data in your paper, please see our guide on how to cite the SDSS. We hope you find our resources useful!

If you have questions about working with SDSS data, please email our helpdesk.

Accessing the Data

Data Release 16 includes six types of data: images, optical spectra (SDSS/SEGUE/BOSS/SEQUELS/eBOSS), infrared spectra (APOGEE/APOGEE-2), IFU spectra (MaNGA), stellar library spectra (MaStar), and catalog data (parameters measured from images and spectra, such as magnitudes and redshifts).

The SDSS offers several different online data access tools, each suited to a particular need:

DR16 Science Archive Server
Interactive spectra and image mosaics
Visualisation and analysis tool for MaNGA data cubes and maps
DR16 SkyServer
Browser-based access to the Catalog Archive Server (CAS) database, with resources for learning SQL and projects to teach science
Flexible advanced SQL-based interface to the CAS, for all data releases (quick registration required). To select data from DR16, choose DR16 as the query context.
Direct download access to DR16 FITS data files for experts
Data Model
Details of the Science Archive Server (SAS) directory structure, file formats, and the contents of each file

Past Data Releases

About Data Release 16

The links below give more information about various aspects of DR16. Most of these links are also available from the second-level menubar at the top of each page in the DR16 section of this site.

What's new?
Explains the differences between DR16 and previous data releases.
Describes what data are available in DR16, including sky coverage, data size, and resolution information.
Shows how to get common types of SDSS data, and provides links to all SDSS data access tools. This is the best place to look for a quick start using SDSS data.
Explains what imaging data DR16 contains. It also provides details on the SDSS imaging pipeline, the calibration process, and what quantities (including units) are available in imaging catalog data.
Optical Spectra
Explains what data are available from the SDSS's two optical spectrographs (SDSS-I and BOSS), and provides details on associated data, including target flags, redshifts, and classifications.
APOGEE Spectra
Explains what data are available from the SDSS's APOGEE infrared spectrograph, and provides details on associated data including information on the spectra, targets, radial velocities, and determinations of stellar atmospheric parameters.
MaNGA Spectra
Describes the available data and methods from the new component survey Mapping Nearby Galaxies at APO (MaNGA), which uses integral-field spectroscopy to learn about the dynamics and compositions of nearby galaxies.
MaStar Library
Explains the available data from the MaNGA Stellar Library (MaStar), which uses the MaNGA fibre bundles in bright time to observe stars.
Describes the data and methods of the MARVELS component survey, which searched for extrasolar planets around nearby stars.
Value Added Catalogs
Gives an overview of all the Value Added Catalogs (VACs) available in DR16.
Lists the principal SDSS data processing algorithms, including target selection, and contains complete details on how the algorithms work. It also includes software for working with SDSS data.
Contains a glossary, Frequently Asked Questions, and other resources to help you get started in using DR16.
Provide step-by-step guides to common research and teaching tasks using SDSS data. This is a good place to look for guidance in doing your science with the SDSS.

Complete details about DR16 are documented on this site, and in the Data Release 16 paper Ahumada et al. 2019, submitted to ApJS.

SEGUE and SDSS Legacy Sky Coverage
SEGUE and SDSS Legacy Sky Coverage
BOSS/eBOSS Spectroscopic Footprint as of DR16.
BOSS/eBOSS Spectroscopic Footprint as of DR16.
A map of APOGEE fields included in DR16, color-coded by number of targets
APOGEE fields included in DR16, color-coded by number of targets.
DR16 MaNGA spectroscopic coverage: observed plates are shown in blue.
DR16 MaNGA spectroscopic coverage: observed plates are shown in blue.
The SDSS telescope at night
The SDSS telescope at night
Image Credit: Patrick Gaulme