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The Catalog Archive Server - An Introduction  The Catalog
Archive Server (CAS) provides access to the object catalogs and
related data from the Sloan Digital Sky Survey (SDSS). It is a
companion to the Data Archive Server (DAS), which allows users
to download images and spectra from the survey.  The CAS uses a
Microsoft SQL Server database to store and serve the data. Users
can access this data by a number of methods.  Simple Search:
Rectangular Radial   SQL Interfaces: Web Page sdssQA Emacs
Command Line List Uploads: CrossID SpecList   Visualization:
Finding Chart Image Lists NavigatorExplore    1. The SkyServer.
This provides a variety of methods to retrieve data:     1.
Radial search. Allows entry of a central coordinate, radius, and
constraints on the five simplified magnitudes (ugriz). This
query returns ONLY the object coordinates, type. simplified mags
with errors, and the object id, as well as the quantities
necessary to get data from t