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Data Release 2

Sky coverage of imaging data in the DR2
Sky coverage of spectroscopic data in the DR2
The Sloan Digital Sky Survey has released its second Data Release (DR2). DR2 is about 1.5 times the size of DR1 in spatial coverage. The photometric data in DR2 are based on five-band imaging observations of 3324 square degrees of sky, and include measures of 88 million unique objects.

Based on these photometric data, objects were selected for spectroscopy to a surface density of about 120 extragalactic candidates per square degree. DR2 includes these spectra, with derived spectroscopic parameters, for over 295,000 galaxies and quasars.

Details of the Data Release 2 can be found at http://www.sdss.org/dr2/.

Data Release 1

Sky coverage of imaging data in the DR1
Sky coverage of spectroscopic data in the DR1
The first official Data Release (DR1) of SDSS was in June 2003. DR1 includes reprocessed data from the Early Data Release. (Reprocessing means that the data are not exactly identical from the EDR, however.) The photometric data in DR1 are based on five-band imaging observations of 2099 square degrees of sky, and include measures of 53 million unique objects.

DR1 includes spectroscopic parameters for over 150,000 galaxies and quasars.

Details of the Data Release 1 can be found at http://www.sdss.org/dr1/.

The Early Data Release

Sky coverage of imaging data in the EDR
Sky coverage of spectroscopic data in the EDR
The Early Data Release of the Sloan Digital Sky Survey consists of five-band images and measured parameters for all detected sources, as well as spectra, redshifts and other spectroscopic parameters. While these data are derived from commissioning observing runs, the quality of the data and calibrations already support a wide range of scientific applications.

The available data products include: a searchable catalog containing the detected objects and their associated image and spectral parameters or attributes, 3-color pictures in JPEG format, data images in FITS format, and spectra in both GIF and FITS format. The EDR covers about 462 square degrees.

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