The SDSS Data Release Supplemental (DRsup)
DR5 and DRsup are to be described in the DR5
paper, Adelman-McCarthy et al. 2007, ApJ Supplements, in press [pdf, 1
What DRsup contains
As described in about DR5,
there are a number (about 361) "special" and "extra" plates in DR5, a
fraction of which do not have imaging data associated with them in the
DR5 CAS database. The purpose of DR supplemental is to make this
imaging data (FITS binary table catalogs of objects along with
corrected frames and auxillary flat file data) available to users
through a DAS-style interface.
We are now making available images and associated catalogs from
three categories of special runs. They are:
- A series of
repeat runs (65 in all on both N and S strips) of the Equatorial
Stripe in the Southern Galactic Cap (Stripe 82);
through M31 and the Perseus Cluster;
- Scans taken at low
Galactic latitude as part of the SEGUE project; these runs were used
to target stars on special
It is intended that DRsup offers access to the SDSS
imaging runs associated with these plates.
Here is the list of imaging
runs available through DRsup.
While these runs are not yet archived in a CAS SQL database, they
are available as part of a DAS (Data Archive Server) for DRsup, this
is a flat-file web-based file server which allows retrieval via
'browser-tools' such as IE, Firefox or command-line interfaces such as
'wget' or 'curl'.
Each DR5 DAS interface has a parallel DRsup
interface, including a FOOTprint server (is
a given coordinate included in the DRsup) and a DR6sup retrieval
This is the list of DR6sup runs web-links
Much of the data in DRsup is imaging at low Galactic latitude |b| <
25 degrees, and as such, there are highly crowded fields, and regions
of high extinction. These data were processed with the standard SDSS
photo pipelines. Since these pipelines were not designed to work in
such crowded regions, the quality of the photometry in these areas is
not guaranteed to be accurate to the SDSS quoted limits of 2% in color
and r magnitude, nor is each and every crowded frame fully deblended;
i.e. many fields are incompletely cataloged.
Additionally, for the repeat stripe 82 scans, some scans were taken in less than
ideal seeing or photometric transparency, and the user is cautioned to
regard the quoted errors on objects with care. No attempt was made to adjust the
quoted errors to account for extinction, crowded field photometry, slight
non-photometric conditions or bad seeing (FWHM > 2.0 arcsec).
and tables are available on a run-by-run and field-by-field basis
One may use the plots linked on the DRsup QA page to further determine the
quality of individual runs and fields within the runs. See: Photometry QA for more information on interpreting runQA.
Last modified: Tue Apr 17 08:45:42 CEST 2007