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The Ninth SDSS Data Release (DR9)

DR9 Facts
Sky coverage 14,555 square degrees
Catalog objects 932,891,133
Galaxy spectra 1,457,002
Quasar spectra 228,468
Star spectra 668,054

Data Release 9 (DR9) offers the latest data from the Sloan Digital Sky Survey. Data Release 9 is the first release of the spectra from the SDSS-III's Baryon Oscillation Spectroscopic Survey (BOSS), which includes more than 800,000 spectra over 3,300 square degrees of sky, observed with the new 1,000-fiber BOSS spectrograph.

Data Release 9 also includes all imaging and spectra from prior SDSS data releases, and provides corrected astrometry for the imaging from Data Release 8.

DR9 also includes better stellar parameter estimates, provided by an updated SEGUE Stellar Parameter Pipeline (SSPP). The principal changes from DR8 are summarized in the What's New in DR9.

Imaging coverage check
Enter the RA/Dec position in decimal degrees or in the format HH:MM:SS / ±DD:MM:SS.
Results will appear in the white space below.
DR9 spectroscopic coverage
DR9 sky coverage
(click for a larger version)

Using DR9

The figure to the right shows the sky coverage of DR9. The form to the right allows you to find whether a sky position (RA and Dec in decimal degrees or HH:MM:SS / ±DD:MM:SS) is contained within the DR9 survey area.

The Scope of DR9 provides more detailed information about DR9 sky coverage, and includes a coverage check form that links directly to SDSS imaging and spectroscopic data.

The items in the menubar above contain the following information about DR9:

Complete details about DR9 are documented on this site and in the Data Release 9 paper (Ahn et al., 2012, ApJS, 203, 21).

Acknowledging DR9

Publications using SDSS data are required to include the complete official SDSS-III acknowledgment. Data from the SDSS-III public archive may not be used for any commercial publication or other commercial purpose except with explicit approval by the Astrophysical Research Consortium (ARC). Requests for such use should be directed to the ARC Corporate Office via ARC's Business Manager:

Michael L. Evans
ARC Business Manager
c/o University of Washington, Department of Astronomy
Box 351580
Seattle, WA 98195
Phone: 206-685-7857
email: evans -at- astro dot washington dot edu.