Here we list the 81,189 quasars from the SDSS Quasar Catalog V
(Schneider et
al. 2010) which have DPOSS observations. The time lags reach up to
20 years in the observer's frame. We include the SDSS gri
photometry as well as the DPOSS GRI photometry and epochs. To calculate synthetic
POSS GRI magnitudes from the SDSS photometry (in order to compare the
magnitudes), use the formulae available here .
Note: To compile this sample, we used the DPOSS data recalibrated by
Sesar et al. (2006) in the 8,000 deg2
of sky from the SDSS Data Release 5. Please go here
for the longer-term (50-year), but smaller
SDSS-POSS catalog using POSS-I and DPOSS data
recalibrated to DR2.
Please click on the following for the file format:
sdss-poss_release.dat (81,189 rows x 30 columns)