Value Added Catalogs

In addition to the primary SDSS photometry and spectroscopy, there are a few extra catalogs created by our collaborators that are distributed through the SAS. These Value-Added Catalogs (VACs) are listed below, and include catalogs that were released in earlier data releases.

SEGUE Duplicate Observations Catalog

Scientific Analysis Catalog

List of identifiers for repeat SEGUE observations.

Young Sun Lee
Location on SAS:
Data model:
This VAC is described in full at


This catalog provides a list of identifiers for repeat spectroscopic observations of individual photometric targets in SEGUE. These are particularly useful for testing consistency of the SEGUE Stellar Parameters Pipeline (SSPP).

Catalog last modified: 2021-12-06 07:36:54

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