Southern Standard Stars for the u'g'r'i'z' System:

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"Having a photometric system without standard stars is like
 measuring the distance from New York to Paris in meters without 
 defining the length of the meter."

                        --Arne A. Henden & Ronald H. Kaitchuck
                          "Astronomical Photometry"
                          (copyright 1990, Willman-Bell, Inc.)

Locations of the 158 Smith et al (2002) primary standards (asterisks) and the 58 fields of the southern extension to the primary standard star network (unfilled squares). Circled symbols indicate u'g'r'i'z' standard stars or fields for which there are currently Landolt UBVRcIc photometry (Landolt 1973, 1983, 1992) or for which Landolt is currently obtaining UBVRcIc photometry (Landolt, in prep)

This is project is one of the NOAO Survey Programs.

This material is based upon work supported by the National Science Foundation under Grant No. 0098401.

Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

Last updated: 19 September 2007
J. Allyn Smith (
Douglas Tucker (
Sahar Allam (