In 1973, Landolt published a list of stars carefully transformed to the Johnson UBV system. He extended that list toinclude stars in the Cousins RC and IC bands in 1983. This was further refined in 1992.

This includes fields near the celestial equator as well as regions farther north and south of the equator.

The Landolt catalog has become the de facto standard for transforming to the UBVRCICsystem

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