Data products overview

DR1 and other data releases

About DR1 explains the contents of this data release and its relation to other data releases.

Data products in DR1

• Images

  FITS image files of the corrected frames in five bands, a mask that records how each pixel was used in the imaging pipelines, 4 x 4 binned images of the corrected frames after detected objects have been removed, and "atlas" images, which include all significant pixels around each object.

• Image parameters

  FITS tables containing positions, fluxes, and shapes of all objects detected at >5 sigma on the images

• Spectra

  FITS files of the flux- and wavelength-calibrated, sky-subtracted spectra, with error and mask arrays

• Spectroscopic parameters

  Redshift, spectral classification, and detected lines of each spectrum

• Other data products

  Astrometric calibrations, photometric calibrations, gif and postscript plots of spectra, and finding charts in postscript/jpeg/fits formats.

IAU designations for SDSS objects

Use IAU designations in publications.

Data quality overviews

• Imaging
  • Astrometry
  • Proper motions
  • Seeing and sky brightness
  • Completeness
  • Star/galaxy separation
• Target selection