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• Press

  • New Instrument Peers Through the Heart of the Milky Way
  • These Little Lights of Mine
  • So These Stars Orbit in a Bar...
  • Fireworks
  • The Sloan Guide to the Universe
  • Two Heads Are Better than One
  • A Beast With Four Tails
  • When Dark Energy Turned On
  • Not All Who Wander Are Lost
  • A New Search for Dark Energy Begins
  • Astronomers Release the Largest Color Image of the Sky Ever Made
  • New 3-D Map of Massive Galaxies and Distant Black Holes Offers Clues to Dark Matter and Dark Energy
  • Gone, with the Wind
  • The Great Space Coaster
  • SDSS-III Press Releases

• Future

  • TDSS
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• Contacting SDSS-III

• Science

  • SDSS Image Gallery
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• Surveys

  • APOGEE: Gazing at the Inner Galaxy
  • BOSS: Dark Energy and the Geometry of Space
  • MARVELS: Characterizing Extrasolar Planets
  • SDSS-III: Four Surveys Executed Simultaneously
  • SEGUE: Sloan Extension for Galactic Understanding and Exploration

• Data Release 9

  • Data Access

    • System Status
    • Available Tools for Data Access
    • Bulk Data Downloads
    • Value Added Catalogs
    • Data Volume Table
    • Data Access for SDSS DR9
  • What's New in DR9?

  • Imaging

    • Available imaging data
    • The Imaging Pipeline
    • Imaging caveats
    • The imaging catalogs
    • Image quality information
    • Image Files
    • Understanding SDSS Imaging Data
    • Imaging data

  • Spectra

    • Temperature Estimate from InFred Flux Method (IRFM) - SSPP
    • Understanding SDSS spectroscopic data
    • The Spectroscopic Pipeline
    • List of Changes in SSPP Since DR8 - SSPP
    • Spectroscopic Caveats
    • Flags in the SSPP - SSPP
    • Spectroscopic Target Flags
    • Galaxy Products
    • List of Stars with [α/Fe]
    • Available spectroscopic data
    • Comparisons with High-resolution Sample - SSPP
    • SEGUE Stellar Parameter Pipeline (SSPP)
    • SEGUE Duplicate Spectra
    • Comparisons with Globular and Open Clusters - SSPP
    • Re-calibration of SSPP Parameters - SSPP
    • Individual Methods Used in SSPP - SSPP
    • Decision Tree to Calculate Atmospheric Parameters - SSPP
    • Line Index Measurement in SSPP - SSPP
    • Internal Consistency of Each Parameter in SSPP - SSPP
    • SDSS spectroscopic catalogs
    • Examples of SSPP Output Plots - SSPP
    • Spectroscopic Data Quality Flags
    • Spectra
    • SDSS Spectroscopic Data
    • Accessing SSPP Parameters - SSPP
  • The Scope of DR9

  • Help

    • Frequently Asked Questions
    • Help
    • Glossary of SDSS-III Terminology
  • The Ninth SDSS Data Release (DR9)

  • Algorithms

    • APOGEE_TARGET2: APOGEE secondary target bits (Not in DR9)
    • Flux Calibration
    • Astrometry
    • Secondary target mask bits in SDSS-I, -II (for LEGACY_TARGET2, SEGUE1_TARGET2, SEGUE2_TARGET2, SPECIAL_TARGET2 or SECTARGET).
    • Matching photometry and spectra
    • IMAGE_STATUS: Sky and instrument conditions of SDSS image
    • BOSS Target Selection
    • SDSS-III Bitmasks in IDL
    • Target Selection of F Star Photometric Standards
    • Galaxy Properties
    • A Guide to SEGUE Bitmasks
    • SEGUE1_TARGET2: SEGUE-1 secondary target bits
    • Recommendation on use photometric processing flags
    • SDSS-III Bitmasks
    • Primary target mask bits in SDSS-I, -II (for LEGACY_TARGET1 or PRIMTARGET).
    • RESOLVE_STATUS
    • Spectrophotometry
    • SPECIAL_TARGET1: SDSS special program target bits
    • BOSSTILE_STATUS: BOSS tiling code status bits
    • Special Target Selection
    • CALIB_STATUS: Calibration status for an SDSS image
    • Image quality flags

    • Ancillary

      • Remarkable X-Ray Source Populations
      • High Energy Blazars and Optical Counterparts of Gamma-ray Sources
      • Double-lobed Radio Quasars
      • Very Low-Mass Stars and Brown Dwarfs
      • Broad Absorption Line (BAL) Quasar Variability Survey
      • High-Redshift Quasars
      • Host Galaxies of SDSS Supernovae
      • Star Forming Radio Galaxies
      • The Transient Universe in Stripe 82
      • Reddened Quasars
      • No Quasar Left Behind
      • Bright Galaxies
      • White Dwarfs and Hot Subdwarf Stars
      • Variability-Selected Quasars
      • Galaxies Near SDSS Quasar Sight Lines
      • X-Ray View of Star-Formation and Accretion in Normal Galaxies
      • Variable Quasars with Narrow-line Absorption
      • High-Quality LRG Spectra
      • Distant Halo Giants
      • Brightest Cluster Galaxies in SDSS Stripe 82
      • Low-Mass Binary Stars
      • Luminous Blue Galaxies
      • BOSS Ancillary Targets
      • K-Band Selected Sample of Quasars
      • High-Redshift Quasars from SDSS and UKIDSS
    • Previous versions of SEGUE1 Target Selection
    • SEGUE Target Selection
    • SEGUE1_TARGET1: SEGUE-1 primary target bits
    • Galaxy Properties from the Wisconsin Group
    • SDSS-III Bitmasks in CAS
    • Redshifts, Classifications and Velocity Dispersions
    • Estimates for the ugriz colors of Vega and the Sun
    • Galaxy Properties from the Portsmouth Group
    • SDSS Survey coordinates
    • Measures Of Flux And Magnitude
    • APOGEE_TARGET1: APOGEE primary target bits (Not in DR9)
    • ANCILLARY_TARGET2: More objects selected as BOSS Ancillary Targets
    • FLAGS1: Object flags from photo reductions (first 32 of CAS flags bitmask)
    • BOSS Galaxy Target Selection
    • Stellar Populations Models
    • Legacy Survey Target Selection
    • Understanding the image processing flags - Summary table
    • The Tiling Of Spectroscopy Plates
    • Morphology/Classification
    • Accounting for Observational Biases in SEGUE
    • The BOSS DR9 Lyman-alpha Forest Catalog and Sample
    • Mask bits for an SDSS spectrum
    • BOSS_TARGET1: BOSS survey primary target selection flags
    • BOSS Quasar Target Selection
    • FLAGS2: Object flags from photo reductions (second 32 of CAS flags bitmask)
    • SEGUE2_TARGET2: SEGUE-2 secondary target bits
    • Queries to Isolate the Complete SEGUE-1 G and K dwarf Sample
    • Understanding the image processing flags - Details
    • Deblending Overlapping Objects
    • Extracting PSF Images
    • Photometric Redshifts
    • The Sloan Digital Sky Survey Quasar Catalog: ninth data release
    • Sky Measurements
    • ZWARNING: Warnings for SDSS spectra
    • Galaxy Properties from the MPA-JHU Group
    • Transformations between SDSS magnitudes and other systems
    • Algorithms in SDSS Data Release 9
    • Resolve
    • Wavelength Calibration
    • SEGUE Plates, organized by Program and Survey
    • BOSS Tiling and Geometry
    • SEGUE Stellar Target Selection: Detailed Selection Criteria
    • ANCILLARY_TARGET1: Objects selected as BOSS Ancillary Targets
    • DR9 Galaxy Target Selection
    • SEGUE2_TARGET1: SEGUE-2 primary target bits
    • FLUXMATCH_STATUS: Flags from flux-based matching to SDSS photometry
    • Algorithms: Image masks

  • Software

    • Software Products
    • IDL Help for IDLUTILS
    • idlutils
    • Parameter Files
    • Reading FITS Files
    • IDL Help for Goddard Utilities
    • SDSS-III Software

  • Tutorials

    • Obtaining Spectra based on Color Constraints
    • Proper Motion Tutorial
    • Finding Data Tutorial
    • Cross-ID Tutorial
    • Pairs Tutorial
    • Image Tutorial
    • Understand data
    • Spectra Tutorial
    • Flags Tutorial
    • Understand data
    • Random Objects Tutorial
    • Downloading the data
    • Catalog Tutorial
    • FITS Tutorial
    • Getting Started with SEGUE
    • Using SEGUE and CASJobs
    • Finding Files Tutorial
    • Creating a Large Scale Structure Galaxy Catalog
    • Finding Chart Tutorial
    • Tutorials

• Data Release 8

  • Data Access for SDSS DR8
  • What's New in DR8?

  • Imaging

    • Imaging data access tools
    • The Imaging Pipeline
    • Imaging caveats
    • The imaging catalogs
    • Additional information about imaging
    • Image Files
    • Basics of Imaging Data
    • Imaging data

  • Spectra

    • Basics of SDSS spectrograph data
    • Spectroscopic Data Processing
    • Spectroscopic Caveats
    • Flags in the SSPP - SSPP
    • Spectroscopic Target Flags
    • Spectra and parameters on the Science Archive Server
    • Status of High-resolution Observations - SSPP
    • SEGUE Stellar Parameter Pipeline (SSPP)
    • Comparisons with Globular and Open Clusters - SSPP
    • Individual Methods Used in SSPP - SSPP
    • Decision Tree to Calculate Atmospheric Parameters - SSPP
    • Line Index Measurement in SSPP - SSPP
    • SDSS spectroscopic catalogs
    • Examples of SSPP Output Plots - SSPP
    • Spectroscopic Data Quality Flags
    • Spectra
    • Spectroscopic data
    • Galspec
  • The Scope of DR8

  • Help

    • Obtaining Spectra based on Color Constraints
    • Proper Motion Tutorial
    • Finding Data Tutorial
    • Cross-ID Tutorial
    • Pairs Tutorial
    • Image Tutorial
    • Spectra Tutorial
    • Flags Tutorial
    • Random Objects Tutorial
    • Catalog Tutorial
    • FITS Tutorial
    • Finding Files Tutorial
    • Finding Chart Tutorial
    • Help!
  • The Eighth SDSS Data Release (DR8)

  • Algorithms

    • Flux Calibration
    • Astrometry
    • Secondary target mask bits in SDSS-I, -II (for LEGACY_TARGET2, SEGUE1_TARGET2, SEGUE2_TARGET2, SPECIAL_TARGET2 or SECTARGET).
    • Matching photometry and spectra.
    • IMAGE_STATUS: Sky and instrument conditions of SDSS image
    • SDSS-III Bitmasks in IDL
    • Recommendation on use photometric processing flags
    • SDSS-III Bitmasks
    • Primary target mask bits in SDSS-I, -II (for LEGACY_TARGET1 or PRIMTARGET).
    • RESOLVE_STATUS
    • Spectrophotometry
    • SPECIAL_TARGET1: SDSS special program target bits
    • Special Target Selection
    • CALIB_STATUS: Calibration status for an SDSS image
    • Image quality flags
    • SEGUE1_TARGET: SEGUE-1 primary target bits
    • SDSS-III Bitmasks in CAS
    • Redshifts and Classifications
    • Estimates for the ugriz colors of Vega and the Sun
    • SDSS Survey coordinates
    • Measures Of Flux And Magnitude
    • Velocity dispersion measurements
    • FLAGS1: Object flags from photo reductions (first 32 of CAS flags bitmask)
    • Legacy Survey Target Selection
    • Understanding the image processing flags - Summary table
    • The Tiling Of Spectroscopy Plates
    • Morphology/Classification
    • Mask bits for an SDSS spectrum.
    • FLAGS2: Object flags from photo reductions (second 32 of CAS flags bitmask)
    • SEGUE2_TARGET2: SEGUE-2 secondary target bits
    • Understanding the image processing flags - Details
    • Deblending Overlapping Objects
    • Extracting PSF Images
    • Photometric Redshifts
    • Sky Measurements
    • ZWARNING: Warnings for SDSS spectra.
    • Transformations between SDSS magnitudes and other systems
    • Algorithms in SDSS DR8

    • SEGUE-2

      • SEGUE Plates, organized by Program and Survey
      • SEGUE Target Selection
      • Using SEGUE and CASJobs
      • Previous versions of SEGUE1 Target Selection
      • SEGUE-2 Algorithms
      • A Guide to SEGUE Bitmasks
    • Resolve
    • Wavelength Calibration
    • SEGUE2_TARGET1: SEGUE-2 primary target bits
    • FLUXMATCH_STATUS: Flags from flux-based matching to SDSS photometry
    • Algorithms: Image masks
  • Glossary of SDSS-III Terminology

  • Software

    • Software Products
    • IDL Help for IDLUTILS
    • idlutils
    • Parameter Files
    • Reading FITS Files
    • IDL Help for Goddard Utilities
    • SDSS-III Software
• Search

• Collaboration

  • The SDSS-III Publication Policy
  • Official SDSS-III Acknowledgement
  • How to Join the SDSS-III Wiki (Private)
  • SDSS Image Use Policy
  • Survey Science Teams and Working Groups
  • SDSS-III Institutions
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  • SDSS-III Policies
  • The SDSS-III Collaboration

• Education

  • SDSS-III Education and Public Outreach
• Site Map
• SDSS-III