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
|Sky coverage of imaging data in the DR2|
|Sky coverage of spectroscopic data in the DR2
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
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.
|Sky coverage of imaging data in the DR1|
|Sky coverage of spectroscopic data in the DR1
DR1 includes spectroscopic parameters for over 150,000 galaxies and quasars.
Details of the Data Release 1 can be found at
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.
|Sky coverage of imaging data in the EDR|
|Sky coverage of spectroscopic data in the EDR
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